Pilot’s Guide Engine Data Management EDM-700 EDM-800 EDM-711 Primary Copyright 2000-2007 J.P. Instruments, Inc. All Rights Reserved J.P. INSTRUMENTS INC. Information: P. O. Box 7033 Huntington Beach, CA 92646 Factory: 3185 B Airway Costa Mesa, CA 92626 (714) 557-5434 (800) 345 4574 Fax (714) 557-9840 www.jpinstruments.com www.jpitech.com www.BuyJPI.com Support@jpitech.
Table of Contents Section 1 Introduction Product Features Engine Data Management Benefits of Proper Mixture Control JPI Probes Temperature and Mixture Section 2 Displays and Controls Displays Modes Buttons Parameter Scan— EDM-700 without Fuel Flow Options Automatic Parameter Scan—EDM-711 Section 3 Operating Procedures Diagnostic Testing on Startup and During Flight Modes Automatic Mode Manual Mode LeanFind Mode—Leaning Rich of Peak LeanFind Procedure—General Explanation Operation for each Phase of Flight Sh
Navigation Data Formats GPS-C Fuel Flow Format for GPS Bi-directional Comm Diagnostic Messages, Fuel Flow Navigation Data Ports for GPS Comm Section 15 Option Connector Pin Assignments Section 16 Reference Reading Section 17 Technical Support Limited Warranty Index 46 46 47 47 48 49 49 50 51 How to Change Modes (page 7) EDM-700 enters Automatic mode two minutes after power up tap STEP and LFsimultaneously tap STEP button ST EP tap LF, then tap STEP LF LEAN FIND starts LeanFind procedure EP ST th F sl
Section 1 - Introduction Product Features indicates standard feature Hands-free, automatic scanning (711: primary only) All programming done from the Front Panel LeanFind finds the first and last cylinder to peak with true peak detect—eliminates a false peaks Displays both leaned temperature below peak and peak Battery voltage with alarm 24 Programmable alarm limits Normalize view DIF low to high EGT with alarm EGTs to stable 1°F resolution Shock cooling monitored on every cylinder User selectable index
Engine Data Management The EDM Engine Data Management system is the most advanced and accurate piston engine-monitoring instrument on the market. Using the latest microprocessor technology, the EDM will monitor up to twentyfour critical parameters in your engine, four times a second, with a linearized thermocouple accuracy of better than 0.1 percent or 2 F°.
From the cockpit you can adjust the fuel/air ratio by a process called leaning. Retarding the mixture control changes the fuel/air ratio and hence the resulting Exhaust Gas Temperature (EGT). The following figure depicts the mixture and temperature relationship. Best economy range Last cylinder to peak. Use for Lean of Peak leaning with GAMI injectors 0 -50 -100 T EG CH First cylinder to peak.
A single EGT gauge merely gives you an average of each cylinder’s temperature: some cylinders can be too rich, while others too lean. Variations produced by differences in fuel distribution, ignition, and compression will cause each cylinder to follow its own mixture and temperature relationship such that one cylinder will reach peak before another.
Normalize and Percentage View Indicators Percentage view: when there is a dash — near the P at the top of the display (EDM-700) or NRM is not lighted (EDM-800), the columns indicate percent of EGT red line. Each column is composed of a stack of segments. A maximum height column depicts 100 % of red line and a one segment-high column depicts 50 % of red line. For example, if the red line is 1650°F, a maximum height column represents 1650°F and a one segmenthigh column represents half that value, or 825°F.
To change the display of engine temperatures see “Changing the Alarm Limits” on page 42. Cylinder Numbers and Dot Index A row of numbers 1 through 6 and the letter T are the column labels for the analog display. The 1 through 6 are the cylinder numbers. If the TIT option is installed, the T denotes the last column is displaying Turbine Input Temperature (TIT) as a column. If the T is absent and the Oil temperature option is installed, the last column displays Oil temperature.
(three digits). Other parameters are displayed in the digital display as described in the subsection “Parameter Scan— EDM-700 without Fuel Flow Option” on page 9. The EDM-711 will briefly display EGT – CHT before displaying the numerical values. NRM 1 73 2 3 4 HP 5 F 6 T TSO _ EGT CHT % Limit 450 350 4 digit display of EGT _ 250 I340 376 STEP EDM JPI 800 LF 3 digit display of CHT Display Dimming The entire display panel features automatic dimming.
LeanFind Mode Simply pre-lean, tap the LF button and begin leaning. The EDM will assist you in finding the first cylinder to peak. Buttons I340 376 STEP STEP button EDM-700 JPI LF LF button Buttons, Front Panel Two operating buttons control all functions of the EDM. The term tap will be used to denote pressing a button momentarily. The term hold will be used to denote pressing and holding a button for five seconds or longer. STEP Button Located on the lower left side near the instrument face.
In Automatic or Manual modes, tapping the LF button will change to the LeanFind mode. In Automatic or Manual modes holding the LF button for three seconds will toggle between Percentage and Normalize views. P: Percentage view hold LF button for 3 seconds N: Normalize view In the LF mode holding the LF button after peak EGT is found will display peak EGT.
Parameter Example Comments Voltage, System Bus I4.
Section 3 - Operating Procedures Diagnostic Testing on Startup and During Flight When your EDM is first turned on, all digits light up for a few seconds, permitting you to check for non-functional segments. Then each column is self-tested in sequence while the EDM tests internal components, calibration and integrity of the probes. If a problem is found, it will be displayed as OPEN PRB or CAL ERR, followed by the name of the probe or channel.
Then tap both the STEP and LF buttons simultaneously. Excluded parameters display a decimal point before the parameter name. For example: Included: I84 OIL Excluded: I84 .OIL Tapping the STEP and LF buttons simultaneously will toggle back and forth between include and exclude. Every time you turn on the EDM, all parameters are reset to be included. All installed parameters are always displayed in the Manual mode. Exclusion only applies to the Automatic mode.
LeanFind Procedure—Step-by-Step Procedure 1 Establish cruise at approx. 65 to 75% power. Pre-lean the mixture to 50°F estimated rich of peak EGT on any cylinder: _____° Wait one minute Example Comments I490 370 3 4 Tap the LF button *For your first flight with the EDM, use the method shown below. Let engine stabilize. LEAN R 5 Lean the mixture—approx. I520 LF Start LeanFind. (Optionally to change to “lean of peak” method, hold both STEP and LF simultaneously.
Lycoming and Continental engines have established specific restrictions on leaning that must be followed, such as percentage of power, climb leaning, and TIT limits. Lycoming recommends operation at peak EGT for power settings of 75% or lower, while Continental recommends operation at peak EGT for power settings of 65% or lower. This guide is not meant to supersede any specific recommendations of the engine manufacturer or airframe manufacturer. It is your responsibility to know your aircraft’s limitations.
Continue leaning slowly without pausing. With a vernier mixture control, turn the knob about a quarter turn every second. With a nonvernier or quadrant mixture control, lean slowly and smoothly about 1/16 inch every five seconds. Eventually, one cylinder will reach peak before any of the other cylinders. The EDM will determine this automatically. Notice that this cylinder does not necessarily have the hottest EGT.
To use the “lean of peak” method, tap LF and then immediately hold both STEP and LF until you see LEAN L. Once you begin leaning (flashing dot) you cannot change leaning methods. You may toggle back to LEAN R by holding both buttons again. Leaning Lean of Peak Cylinder number flashes when the cylinder peaks 73 1 2 3 4 HP 5 6 TSO First cylinder to peak has CHT largest column 500 Temperature below peak of last cylinder to peak Hold LF to see peak temperature of last cylinder to peak (e.g.
flash. You will notice that in some cases the TIT reads 100°F hotter than the hottest EGT. This is caused by unburned fuel in the exhaust and igniting. The reduced size of the JPI Hastaloy-X-tip probes produces faster response and more accurate than the massive factory installed probe. Therefore JPI probes may read as much as 100°F higher than the factory installed probe.
Operation for each Phase of Flight Engine Run-Up Suggested setup: Verify: uniform rise of about 50°F in all EGTs in single Runup RPM magneto operation uniform rise of EGTs with application of the Normalize view mixture control. Be alert for: Manual mode unusually low voltage (less than nominal battery voltage) cold OIL abnormally high CHT a higher EGT on one cylinder in dual magneto operation—indicates fouled spark plug. Include your EDM on your run-up checklist.
Cruise After the engine is warmed up, use LeanFind to lean the mixture. Suggested setup: Percentage view Automatic mode Be alert for: uneven EGTs or CHTs (carbureted engines). Make fine adjustments to throttle, then RPM, then mixture to level the display columns. abnormal patterns of EGTs and CHT. (see “Diagnosing Engine Problems” on page 21). Descent Suggested setup: Be alert for: Percentage view CLD: shock cooling alarm is set to –60°F.
Common Misapplications Some of the more common misapplications made by first-time EDM users are presented here in an attempt to help you avoid similar problems. Problem Situation Correction Failure to pre-lean before performing LeanFind or stopping while leaning. Follow the pre-lean procedure in the section “LeanFind Mode” on page 12. Leaning too slowly. Lean more quickly. Peak not found Lean Find not activated or stopping while leaning Lean at the speed of approximately 10°F per second.
Section 4 - Diagnosing Engine Problems Typical Normal Parameters The follow chart lists typical normal parameter values that you will observe for most general aircraft engines.
Engine Diagnosis Chart The following chart will help you diagnose engine problems in your aircraft. (Views are Percentage views). Notice that there will be always one CHT that is shown hotter than the others. Display CHT 500 400 Symptom Probable Cause Recommended Action 75° to 100° EGT rise for one cylinder during flight Spark plug not firing due to fouling, faulty plug, wire or distributor. Enrich mixture to return EGT to normal. Have plugs checked.
Display CHT Symptom Probable Cause EGT and CHT not uniform Dirty fuel injectors or fouled plugs. Check injectors and plugs. Nonuniformity is normal for carbureted engines Decrease in EGT for all cylinders Decrease in airflow into the induction system. Carb or induction ice. Check for change in manifold pressure. Engine units set to Celsius Check that the alarm limits are set to Celsius degrees Slow rise in EGT. Low CHT Burned exhaust valve. CHT is low due to low power output.
Display Symptom Probable Cause Recommended Action (no picture) Loss of peak EGT Poor ignition or vapor in fuel injection system. Have magneto tested. (no picture) Decrease in peak or flat EGT response to leaning process Detonation. Usually the result of 80 Octane fuel in 100 Octane engine. Enrich mixture, reduce power and relean mixture. Repeat to find power setting where normal peak is obtained or run rich. Below 10,000 ft.
When an alarm is displayed, tapping the STEP button will temporarily disable the alarm digital indication for the next ten minutes. When an alarm is displayed, holding the STEP button until the word OFF appears will disable that alarm digital indication for the remainder of the flight. See “Alarm Limits” on page 41. EDM-711 primary alarm display lamps cannot be disabled. Alarm Priority If multiple alarms occur simultaneously, the higher priority alarm will temporarily “mask” the lower priority alarm(s).
pre-ignition will destroy your engine in less than a minute unless you take immediate corrective action. Section 5 - Fuel Flow Option Operation Fuel Flow Display Select Switch The select switch is a three-position toggle switch mounted on your instrument panel near the display of the EDM. It affects only the display scan. In the EGT (Temperature) position only the installed temperature (and battery voltage) parameters are displayed.
Refer to the flow chart. Then tap the STEP button to complete the entry Power up and advance to the Manual mode. Program FUEL ?N Pgm Refuel STEP LF FILL ?N Exit Fill STEP LF FILL ?75 * Yes Change STEP LF FILL ?120 * Yes Add STEP LF Fill ?+ OK STEP Start LF .
To reset to zero the amount of fuel used at any point in time, manually step to display USD and hold both buttons for five seconds until the display shows .0 USD. Fuel Management Without a means of measuring fuel flow, you must rely on the aircraft fuel gauges or total time of flight. Aircraft fuel gauges are notoriously inaccurate (they are only required by the FAA to read accurately when displaying empty).
Select Switch Parameter Description T, A Voltage, System Bus T, A Outside Air Temperature Induction Air Temperature Compressor Discharge Temperature Carburetor Temperature Difference between hottest and coldest EGT RPM MAP for 1 sec T, A T, A T, A T, A T,A,F Example I4.2 BAT 8I OAT I25 IAT Out of intercooler 300 CDT Into intercooler -22 CRB Not available when CDT is installed Dot indicates most widely deviating cylinder 80 DIF 2450 23. I 37.2 REM F, A Fuel Remaining F, A 25.
For fuel calculations to be accurate, it is imperative that you inform the EDM of the correct amount of fuel aboard the aircraft. Do not rely on fuel flow instruments to determine fuel levels in tanks. Refer to original fuel flow instrumentation for primary information Section 6 - Long Term Data Memory The EDM Long Term Data Memory will record and store all displayed parameters once every six seconds (or at the programmed interval of between 2 to 500 seconds).
At power on, the EDM will execute its self test and then display the date (e.g., I I. I2.0 I), the time (I3.26), the percentage of memory filled since the last save (FULL 24), and the Aircraft ID. Downloading from Long Term Memory To download data from the long term memory to your laptop PC, do the following steps. 1. Connect the data cable between the PC serial port and the EDM data port connector mounted on your instrument panel. 2. Run the EzPlot program on the PC. 3.
To download EDM data into a USB flash drive using the accessory USB memory box, follow these instructions. 1. Insert the serial cable plug into the front panel of the EDM. Insert the other end of the serial data cable into the 9-pin jack on the memory box. (The serial cable is supplied with the EDM, not the memory box.) 2. Turn on the power switch on the memory box; the red light on the memory box will light up. 3. Insert the USB flash drive into the USB port on the memory box.
4. Remove the USB flash drive from the USB connector. This completes the download. Continue to the next step. Downloading from USB Flash Drive to a PC To download your data from the USB flash drive to your PC, follow these easy steps. 1. On your PC, start the EzTrends program. 2. Plug in the USB flash drive into an available USB port. 3. In EzTrends, select the Move and Plot Data from Memory Stick option. 4. In the displayed list, find the USB flash drive and double click it. 5.
T, A T, A OAT0 OAT-I0 … OATI0 This step will be normally be skipped. EGT I?N EGT I?N EGT I?Y Y—Yes—sets the digital display to onedegree resolution; N—No—sets 10°. (10° resolution is easier to interpret the EGTs.) HP - ? Y NY Y—Yes—displays %HP in the upper digital window. N—No—displays RPM in the upper digital window. Hold STEP and LF for 5 seconds to adjust the horsepower constant. 70 HP %HP display will change when HP constant is adjusted.
Section 8 - Programming the EDM-800 Horsepower Constant You must adjust the HP Constant once for your aircraft. The default display will be RPM if Fuel Flow is not operational or you can adjust the display to show RPM instead of HP. Before takeoff, put the EDM in the HP Constant mode. Enter the pilot program mode by simultaneously holding the STEP and LF buttons until the display changes, about 5 seconds. 1. Tap STEP about 4 times until you see HP-? Y.
You may need to correct the MAP based on the altimeter setting at a sea level airport. A. Enter the pilot program mode by simultaneously holding the Step and LF buttons for five seconds. B. Tap Step/OK repeatedly until you see—for example— HPConstant=125. Then hold both the Step/OK and Change buttons display until you see Adjust, followed by HP Constant=125. C. Again, Hold both the Step/OK and Change buttons display until you see ADJUST, followed by MAP=0. The adjustment range for the MAP is ±3.0 in Hg.
yellow. Both the EDM and factory original gauge may be used concurrently. Due to the high input impedance of the EDM instrument, it will not affect the accuracy of the factory installed probe or gauge. In normal cruise flight, record the difference between the factory installed TIT gauge and the EDM TIT reading. TIT gauge ________ EDM ________. If you haven’t already done so, start the pilot programming procedure, by simultaneously holding the STEP and LF buttons for five seconds.
Tap STEP to advance to the next item PROGRAM RATE 4 Tap the LF button to sequence through these values RATE 4 ORIG TIT ORIG T-N ORIG T-Y CAL TIT - 975 … + 975 Comments Stays on for two seconds. hold both STEP and LF buttons simultaneously for five seconds to begin the next sequence. Y—Yes—selects factory original TIT probe and proceeds to the next step. Tap the LF button to lower the correction; hold the LF button to raise the correction.
Fine Tuning the K Factor The K factor shown on the fuel flow transducer does not take into account your aircraft’s particular installation. Fuel hose diameters and lengths, elbows, fittings and routing can cause the true K factor to be different from that shown on the fuel flow transducer. You must use the following procedure to fine tune the K factor. 1. Make at least three flights of about two to three hours each.
Fuel Flow Option Programming Procedure Setting the K factor This procedure is different than for setting other parameters. Place the select switch in the FF position. If you haven’t already done so, start the pilot programming procedure, simultaneously hold the STEP and LF buttons for five seconds. You will see the word PROGRAM for two seconds. 1. Tap STEP button to advance to the KF-SET screen 29.00=KF 2. Hold both the STEP and LF buttons simultaneously for five seconds.
STEP TIME MNTH DAY YEAR HOUR MIN N----- END Y LF Comments 2 500 I I2 I 3I 80 79 OO 23 OO 59 Record time interval, in seconds N I23456 Current Aircraft ID. To change Aircraft ID, hold both STEP and LF buttons until the first character flashes. LF selects the first character. STEP moves to the next character. To Save, hold both STEP and LF for 5 sec. Tap STEP button to exit the procedure. Month Day Year (note: represents 1980 through 2079) 24 hour time.
Section 14 - Alarm Limits Factory Set Default Limits—Non-Primary JPI conservatively sets the default alarm limits below Lycoming and Continental recommendations. Parameter CHT OIL TIT CLD DIF BAT, 24 V BAT, 12 V MAP LO FUEL LO TIME Default Low Limit 90°F 32°C 24V 12V 45 min 10 gal, kg, ltr, lbs Default High Limit 450°F* 230°C 230°F* 110°C 1650°F* 900°C -60°F/min. -33°C/min. 500°F 280°C 32V 16V 32 inches Alarm Example 465 CHT 280 OIL I 720 TIT -65 CLD 525 DIF 22 .4 BAT I7.6 BAT 46.3 MAP 00.20 H.M 7.
Hold both buttons for 5 seconds until the word Tap STEP button until the words PROGRAM END Y Hold both buttons for 5 seconds until the words FAC LIM The display will then sequence as shown in the chart below. Tap the STEP button to advance to the next item in the list. Tap the LF button to select alternate values of that item. Hold the LF button to increase a numerical value; tap the LF button to decrease a numerical value. The shaded areas in the chart below pertain only to the Fuel Flow Option.
FUEL GAL MAIN=50 FUEL GAL FUEL KGS FUEL LTR FUEL LBS MAIN=0 … MAIN=999 AUX? N AUX? NAUX? Y AUX=0 MIN =45 AUX=0 … AUX=250 MIN =0 … MIN =60 REM =I0 REM =0 … REM =200 CARB? CARB? N CARB? Y RECRD? RECRD? Y RECRD? N CYL=6 CYL=4 … CYL=I 2 HP = I 80 HP=60 … HP=500 I 4.90 = EC I 2.00= EC… I6.
If you do not have auxiliary tanks or tank tabs, answer “No.” If you answer “Yes,” you will be asked to input the capacity of the auxiliary tanks in the fuel flow units selected. If you have tank tabs and sometimes fill only to the tabs, set the auxiliary tank capacity to the difference between full tank capacity and tab capacity. The EDM does not differentiate fuel flow between the main and auxiliary tanks; it tracks only total fuel in the aircraft.
Initially Entering the Tank Capacity To initialize or change the tank capacities, hold the STEP button while turning on the power to the EDM. The following program steps will be displayed: Tap STEP to advance Tap the LF button to sequence through these values MAIN=50 MAIN=0 … MAIN=999 AUX? N AUX? NAUX? Y AUX=0 AUX=0 … AUX=250 Comments Main tank capacity, in units selected Y—Yes—aircraft has auxiliary tanks Auxiliary tank capacity Navigation Data Formats Output of any GPS; input to EDM.
Diagnostic Messages, Fuel Flow The following displays indicate a malfunction in the Fuel Flow Option transducer or associated electrical connections: 0.0 GPH --- GPH --- H.M Zero’s indicate Fuel flow is too low to register Dashes indicate No fuel flow transducer signals Dashes indicate No fuel flow transducer signals GPS Interface Diagnostics Parameters REQ, RES, & MPG are all missing from the scan. No communications from GPS receiver to EDM. Possibly no connection or aircraft GPS is off.
Fuel Data (input to GPS; output of EDM) RS-232. Serial data format: 8 data, 1 start, no parity. Baud rate: 9,600. Output format is determined by the GPS-C setting, but may be overridden by the GPS navigation format: If the EDM senses Northstar or NMEA-183 navigation data input, there will be no fuel data output. Section 15 - Option Connector Pin Assignments P1 (upper) 25-pin connector for 4 or 6 cylinder engines. See installation manual for 7, 8, 9 cylinder instruments Pin Pin Probe or no. no.
Section 16 - Reference Reading You may wish to know more about the effect of engine operations on EGT and CHT. The reading list below provides general overviews as well as original references on topics that may be of interest. General Overview These references are readily available to pilots and provide a readable source of general technical information. Teledyne Continental Motors, Engine Operation for Pilots, from the FAA Accident Prevention Program, FAA-P-8740-13.
Limited Warranty J.P. Instruments Inc. (JPI) warrants all parts in your new EDM to be free from defects in material and workmanship under normal use. Our obligation under this warranty is limited to repair or exchange of any defective part of this unit if the part is returned, shipping prepaid, within three years for electronics and one year for probes from the date of original purchase. Installation labor is the responsibility of the aircraft owner.
Index A Accumulate, 34, 39 total, 27 Adapter probe, CHT, 21 Adding fuel, 27 Adjusting K-factor, 37 OAT, 34 TIT, factory original, 36 Alarm Display Lights, 40 Alarm limits changing, 41 factory defaults, 41 fuel flow, 43 Alarms, 24 low fuel, 44 priority, 25 resetting, 25 ALL, 34 select switch, 26 Allied Signal, 45 Arnav, 45 Automatic indexing mode, 7 Automatic mode, 11 AUX, 43, 45 Auxiliary tanks, 43 Avgas, 25 Aviation data format, 45 B Bar graph, 4 column resolution, 6 EGT, 6 Baud rate, 46 Blinking display
self test, 11 DIF, 10, 24, 29, 42 Dimming, display, 7 Display, 4 analog, 4 digital, 6 flashing, 13, 17, 24, 25 Dot index, 6 Download, 31 E Economy, best, 3 EDM-711, 40 EGT alarms, 24 loss, 22 probe, 2 resolution, display, 34 select switch, 26 too high, 20, 22 too low, 20, 23 Electronics International, 45 Engine diagnosis chart, 22 limits, normal, 21 run-up, 18 Enunciator, alarm, 24 Exclude parameters, 11 Exhaust leak, 18, 24 EzPlot, 31 F Factory default alarm limits, 41 Factory original TIT probe, 36 Fahr
I Ice, carburetor or induction, 23 Ignition, 24 timing, 22 Include parameters, 11 Index dot, 6 Indexing rate, 37 sequence, 29 Induction, 23 air temperature, IAT, 10, 29 Informing the EDM-700 startup fuel, 26 Initial tank capacity, 45 Injectors.
missing segment, 6 OIL, 10, 29 Oil temperature, 10, 29 OPEN PRB, 11 Operation fuel flow option, 26 temperature scanner, 4 Option connector, 47 Outside air temperature. See OAT P Panel Alarm Display, 40 Parameter indexing, 9, 28 Peak EGT, 13 PEAK EGT, 13, 15 Percentage view, 5 Pilot programming, 33 alarm limits, 41 data recording, 39 fuel flow option, 37 Pin assignments, option connector, 47 Power, best, 3 PPH, 29 Pre-ignition, 23, 25 Pre-leaning.
Timing, ignition, 22 TIT, 10, 16 factory original probe, 36 missing segment, 6 Toggle, N, P, 5 Top fuel tanks.
Quick Reference Guide Normalize View Hold LF for three seconds. Percentage View Hold LF for three seconds. Automatic Scan 1. Tap LF. 2. Tap STEP. Exclude Parameter in Automatic Scan (except EDM-711) 1. Tap STEP to index to the parameter to exclude. 2. Tap both STEP and LF. 3. See decimal point before parameter name to exclude. Change Indexing Rate 1. Hold both STEP and LF until the display shows PROGRAM, followed by FUEL? N. 2. Tap STEP and see RATE 4. 3.
Filled Tanks In flight, do this first (on power up, skip to step 4): 1. Hold both STEP and LF until the display shows PROGRAM, followed by FUEL? N. 2. Tap LF to see FUEL? Y. 3. Tap STEP 4. See FILL? N. Tap LF to see FILL 75* 5. With aux tanks or tabs, tap LF again to see FILL I20* 6. Tap STEP to exit. Added or Removed Fuel In flight, do this first (on power up, skip to step 4): 1. Hold both STEP and LF until the display shows PROGRAM, followed by FUEL? N. 2. Tap LF to see FUEL? Y. 3. Tap STEP. 4.
