Gasboy CFN Series Diagnostic Manual - Manual (Page 223)

Pump Control Unit
12/26/02 6-33
Pump/Dispenser Resets But Does Not Dispense Fuel
MANUAL TEST: Place the pump override switch in the MAN position. Power to the pedestal
pump control unit must be on. Turn on the pump handle. If the pump resets,
go to AUTOMATIC TEST at the end of this section.
Possible Cause Checks Corrective Action
No +12VDC relay drive
power. Place the + meter probe on
pin 2 (red wire) of PPC
Motherboard connector P1.
Place the - meter probe on
the appropriate SUB, SLOW,
FAST relay drives on PPC
Motherboard connector P2. If +12VDC is not measured
between P1, pin 2 and all
three relay drives, replace the
PPC Motherboard.
Defective relay. Measure between AC neutral
and the relay inputs (A, C, E)
and the relay outputs (B, D, F)
on the PPC relay bracket. If 115VAC is measured at a
relay input but not at its
corresponding output, replace
the relay.
Defective electric reset,
defective pump motor, or
defective solenoid(s). Turn the pump handle on.
After reset has completed,
check if 115 (230) VAC is
measured at the pump motor
and the solenoid(s). If 115 (230) VAC is not
measured at the pump motor
and the solenoid(s), repair or
replace the electric reset.
If 115 (230) VAC is measured
at the pump motor but it
doesn't turn, replace the
pump motor.
If 115 VAC is measured at the
solenoid valve(s) but it
doesn't click open, replace
the valve(s).
Out of fuel. Stick the tank to check fuel
level. Order fuel if tank is empty.
Pump lost prime, poor siphon
action, defective pumping
unit. None. Call a qualified pump service
technician.