Corrective ActionsProbable CauseSymptoms
Stick the tank and make sure there is fuel.No fuel in tank or Pump draw-
ing air
Pumping unit
will not prime
Remove nozzle and try to dispense product.
Replace hose or nozzle.
Defective nozzle or hose
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
Check that voltage being supplied is within
the limits set on the motor serial plate
Incorrect operating voltageMotor run-
ning too slow
Inspect parts in the CPU. (see instructions
for rebuilding the pumping unit
Internal wear in the compact
pumping unit
Repair or replace the by-pass valve assem-
bly
By-pass valve stuck in the par-
tially closed position
Replace motorDefective motor
11.8 Repair
Reference the Figure 11.1 and Figure 11.2 when performing the repair procedures listed in this
section.
11.8.1 Lapping the Pressure Relief Valve
If the pressure relief valve is held in the open position, either by debris or an imperfection in the
poppet or its seat, the pump will deliver slower than normal. Check the poppet and its seat, using
the following procedure:
CAUTION!
Avoid Valve Stem Damage
Throughout the lapping and checking process, care
must be taken to avoid damaging the valve stem.
1
Remove the relief valve cap, complete with the seal cap, adjusting screw, and gasket.
2
Remove the valve spring and, using a pair of pliers, remove the poppet.
3
Examine the valve seat for signs of debris.
190 WM048523 Rev 08 01/2019
11 Suction Pumps
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