Operation and maintenance manual

QSB4.5 and QSB6.7 Electronic Controlled Fuel System
Section 1 - Operating Instructions Page 1-11
Some vehicles will also have a WAIT-TO-START lamp
and a WATER-IN-FUEL lamp. The WAIT-TO-START
lamp is illuminated during the preheating time that takes
place at keyswitch ON during cold-weather starting. To
minimize cranking time during cold-weather starting, the
engine should not be cranked until the WAIT-TO-START
lamp has been extinguished.
The WATER-IN-FUEL lamp indicates that the engine's
water-in-fuel separator needs to have the water drained
out of it. This task should be performed as soon as
possible whenever this lamp is illuminated. Some vehicle
manufacturers will combine the functions of the
MAINTENANCE and WATER-IN-FUEL lamps. In these
cases, the MAINTENANCE lamp would indicate a
WATER-IN-FUEL warning, in addition to other
maintenance indicators.
There are two ways to check for active engine electronic
fuel system fault codes and maintenance indicator codes,
depending on whether the engine is equipped with a
diagnostic switch.
Vehicle with Diagnostic Switch
• Turn the keyswitch to the OFF position. Move the
diagnostic switch to the ON position, or connect the
shorting plug into the diagnostic connector. Turn the
vehicle keyswitch to the ON position.
Vehicle without Diagnostic Switch
• Turn the vehicle keyswitch to the ON position. With the
keyswitch on and the engine not operating, cycle the
accelerator pedal to full throttle and back to the idle
position three times.
If no active fault codes are recorded, both lights will come
on and stay on.
If active fault codes are recorded, both lights will come on
momentarily, then begin to flash the code of the recorded
fault(s).