User guide

ManualsBrandsFuelab ManualsCar52901 Electronic Fuel Pressure Regulator

IGNITION

SWITCH

From

+12V

Source

White (16-20ga)

Black (16-20ga)

Red (16-20ga)

Green

(16-20ga)

Insulate this

wire, if not

in use.

Fused Circuit

(1-5A)

109020121-1, No Rev Sheet 5 of 6

TROUBLESHOOTING:

Model 52901-c

Electronic Regulator

Electrical Plug

and Wire

(Supplied)

Signal Input

DAQ System or

Data Logger

Device (Not Supplied) is

not required, however can

be used to track general

fuel system output.

Fuel Pump(s) ONLY!

(Not Supplied)

Compatible with

Fuelab Prodigy Series

See Prodigy Instructions

for Proper Power Connections

Electrical Planning Notes:

Use Male Connector with wire (Provided with Regulator), to allow a sealed electrical connection to the Electronic

Regulator. The regulator requires very little power, and does not control the input power to the fuel pump. Follow

the Wiring Schematic Diagram provided with the Fuelab Prodigy Series Fuel Pump, to properly wire power and

ground leads to pump.

Electrical Wiring Schematic (Less Power Supply and Ground to Pump):

Problem Possible Cause Possible Solution

Not operating or

slight “clicking”

sound from pump

when turned on.

• Faulty fuel pump relay.

• Faulty, dirty or corroded

terminals or improperly sized

wire.

• Debris from tank or plumbing

lodged inside pump.

Check voltage to fuel pump, at power terminals. If

voltage is steady and consistent (within ½ Volt of

battery) then contact Fuelab for repair. If voltage

is inconsistent as described, repair or replace

electrical components as required.

Speed of pump

changes up and

down very

noticeably and

erratically.

• Incorrect wiring of speed control

as specified in wiring schematic.

• Loose terminal or wiring of

speed control circuit.

Unhook speed control wiring from yellow terminal

of pump. Turn on pump; if operation is consistent,

then repair or replace components as required.

Loss of fuel

pressure or erratic

pressure pulsation

after several

minutes of

operation.

• Cavitation (vapor lock) due to

overheating or restricted inlet.

Check temperature of pump right after failure. If

pump is hot to touch (cannot leave hand on pump

due to it being too hot), then follow proper speed

control wiring example, or look for other sources

of heat such as exhaust. If pump is not hot to the

touch, check for inlet restrictions such as

improperly vented tank, kinks in the fuel line, or

too small of plumbing for application. Contact

Fuelab, as pump may be damaged due to

improper operating condition.

Not building up fuel

pressure.

• Incorrect fuel system initial

priming procedure.

• Loose inlet fuel fittings or

leaking plumbing on inlet side.

Repeat procedure for proper priming. If condition

continues, check all plumbing upstream (on inlet

side) of fuel pump.

Fuel pressure

drops off under

heavy engine load,

particularly in

higher gears.