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Symptom
Pump does not take on
water.
Pump takes in water, little or
no discharge.
Suction hose leaks at inlet.
Discharge does not stay on
coupling.
Impeller does not turn, pump
is hard to start.
PAGE 28 — QP3TB TRASH PUMP • OPERATION MANUAL — REV. #0 (12/08/22)
Table 9. Pump Troubleshooting
Possible Problem
Not enough priming water in the housing?
Low engine speed?
Plugged strainer?
Damaged suction hose?
Air leak at suction port?
Pump located too high above water line?
Debris collecting in pump housing?
Too much distance between impeller and
volute?
Water leaking out weep hole between pump
and engine?
Low engine speed?
Partially plugged suction strainer?
Worn impeller/volute?
Fittings/clamps not sealed properly?
Hose diameter too large?
Pressure too high?
Hose kinked or end blocked?
Impeller jammed or blocked?
Impeller and volute binding?
Defective engine?
TROUBLESHOOTING (PUMP)
Add water.
Increase throttle.
Clean strainer.
Replace or repair hose and clamps.
Check that fittings are tight and properly
sealed.
Move pump closer to water.
Clean pump housing.
Adjust clearance by adding shims
(Min. 0.006" – Max. 0.020"), or replace
impeller.
Check condition of mechanical seal and
gaskets between pump end and engine
housing.
Increase throttle speed.
Clean strainer.
Adjust clearance by adding shims or
replace impeller/volute.
Tighten, replace, or add clamp. (Keep
extra seals on pump.)
Use smaller diameter hose or replace
hose.
Check pressure, add additional clamp.
Check hose.
Open pump cover and clean dirt and
debris from inside housing.
Adjust clearance by removing shim from
behind impeller.
See engine owner's manual.
Solution
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