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Owner’s Manual for Water Pump 15
Troubleshooting
PROBLEM CAUSE CORRECTION
Engine will
not start, or
starts and
runs rough. 1. Dirty air filter
2. Out of fuel.
3. Stale fuel.
4. Spark plug wire not connected to
plug.
5. Bad spark plug.
6. Water in fuel.
7. Excessively rich fuel mixture.
8. Impeller obstructed.
1. Clean or replace air filter.
2. Fill fuel tank.
3. Replace with fresh fuel.
4. Connect wire to spark plug.
5. Replace spark plug.
6. Drain fuel tank; replace with fresh
fuel.
7. Contact authorized servicing dealer.
8. Clean impeller.
Pump not
operating. 1. Air leak in suction hose.
2. Suction and/or discharge hoses
blocked.
3. End of suction hose not submerged.
4. Total head exceeds pump capacity.
1. Check suction hose and
connections for leaks. Tighten or
repair.
2. Check hoses and strainer. Clear
obstructions.
3. Increase suction hose length or
move pump closer to water.
4. Reduce total head or choose a
different pump for the task.
Weak
discharge
flow. 1. Air leakage (intake) at suction side
2. Reduced engine power output.
3. Damaged mechanical seal.
4. Suction lift too high.
5. Suction hose too long, or hose
diameter too small.
6. Leaking discharge hose or
connection.
7. Damaged mechanical seal.*
8. Impeller obstructed.
9. Worn impeller.**
1. Check suction hose and
connections for leaks. Tighten or
repair.
2. Contact authorized servicing dealer.
3. Replace mechanical seal.
4. Lower suction lift.
5. Shorten suction hose, or increase
hose diameter.
6. Check discharge hose and
connection for leaks. Tighten or
repair.
7. Replace mechanical seal.
8. Clean impeller.
9. Replace impeller.
Pump does
not prime
water, or
priming takes
a long time. 1. Air leakage (intake) at suction side.
2. Insufficient priming water inside
pump casing.
3. Water drain plug is loose.
4. Engine malfunction.
5. Damaged mechanical seal.
6. Incorrectly sized suction hose.
7. Suction hose is too long.
8. Excessive suction lift. ***
1. Check suction hose and
connections for leaks. Tighten or
repair.
2. Add priming water.
3. Tighten water drain plug.
4. Contact authorized servicing dealer.
5. Replace mechanical seal.
6. Use correct suction hose.
7. Move pump closer to water.
Oil leakage
at muffler or
air cleaner. Engine failure. Repair or replace.
Water
leakage
between
engine and
pump. Damaged mechanical seal. Replace mechanical seal.
* Mechanical seal damage may be caused by normal wear, overheating, or pumping
incompatible fluids.
** Excessive impeller wear is primarily due to cavitation. Causes include restricted suction and
excessive suction lift.
*** Total suction head should not exceed 23 ft (7.01 m).