Dover Wayne Helix WM048523 - Suction Pump Motors; Troubleshooting

11.6 Suction Pump Motors
A motor to drive the CPU is provided on all suction pump model dispensers. See the Parts Ref-
erence section in this manual for a list of the various motor horsepower and operating voltages.
Note!
Suction pumps motors have a relay inside the motor housing, whereas with remote dispensers,
the relays for the submersible pumps are located in a relay box inside the building.
11.7 Troubleshooting
Table 11.1: Problems and Solutions
Corrective ActionsProbable CauseSymptoms
Stick the tank and make sure there is fuel.Pump is drawing airPump motor
is running but
no fuel deliv-
ered
Make sure that the proper type of fuel is be-
ing dispensed, for example, summer gas in
the summer, and winter gas in the winter.
Vapor lock
Make sure the underground piping was
properly installed – not too many elbows,
checks, or excessive runs
Remove nozzle and try to dispense product.
Replace hose or nozzle.
Defective hose or nozzle
Repair or Replace valveBy-pass valve held in the open
position
Replace check valveCheck valve stuck in closed
position
Clean or replaceDirty strainer or filterPump deliv-
ers slowly
Remove nozzle and try to dispense product.
Replace hose or nozzle.
Defective nozzle or hose
Stick the tank and make sure there is productpump drawing air
Repair or replace the by-pass valve assem-
bly
By-pass valve held in the open
position
Inspect parts in the CPU. (see instructions
for rebuilding the pumping unit
Internal wear in the compact
pumping unit
WM048523 Rev 08 01/2019 189
11 Suction Pumps