The tell-tale, or pee hole, on an outboard shows that the water pump is pushing cooling water through the engine. If the stream stops or becomes weak, the most common cause is simply a clogged tell-tale tube, blocked by salt, sand or a small insect. Other causes are a worn or damaged water pump impeller, blocked water intakes on the lower unit, or, after an impeller job, an installation mistake. Stop the engine if the overheat alarm sounds or the engine gets hot.
Common causes
| Cause | Clues |
|---|---|
| Clogged tell-tale tube or outlet | No stream but no overheating alarm and normal temperature |
| Worn impeller | Weak stream, especially at idle; age or running dry; see outboard water pump impeller |
| Blocked water intake | Weeds, plastic bags or mud over the intake grilles |
| Muffs not positioned or low water pressure | Only happens on the hose |
| Thermostat or internal blockage | Overheating with a weak stream; see outboard overheating |
Outboard not peeing but not overheating
If the temperature is normal and there is no alarm, clear the tell-tale outlet first. With the engine off, push a thin piece of wire or a straightened tie into the outlet, or remove the hose and blow it out. A strong stream that returns means the tube was blocked.
Outboard not peeing after impeller replacement
After a new impeller, a missing stream usually means the impeller vanes were bent the wrong way, the drive key or pin is missing, the pump housing was not seated, or the lower unit was not aligned properly when reinstalled. Most impellers must be installed while turning the drive shaft in its normal direction so the vanes curl correctly. Recheck the installation before running the engine further.
Outboard not peeing on muffs
Make sure the muffs cover the intake grilles fully, that the hose is fully open, and that water pressure is enough. Some outboards have intakes in places that standard muffs do not cover well; the manual may recommend a flush port or test tank instead; see how to flush an outboard.
Outboard not peeing at idle
A weak stream at idle that strengthens with rpm often points to a worn impeller. A healthy pump should produce a steady stream even at idle on most motors.
Don’t keep running it hot
An overheating outboard can damage its powerhead quickly. If the alarm sounds or the engine loses power, stop it and investigate; see outboard motor maintenance.
More guides: outboard thermostat.
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