Carburetor Problem


Old 07-31-03, 02:06 PM
Ken S.
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Walbro carb..........


The Walbro WT275 carb on my Singer brand string trimmer weeps fuel out of carb throat when engine is not running. I have used a rebuid kit to replace diaphram(s) and spring loaded metering device. It still weeps. Help!

Ken S.
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Old 07-31-03, 09:32 PM
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Hello Ken!

If you replaced the needle, and it still seeps, then the seat where the needle seals may need cleaning. Also, check to see if a fair amount of pressure is building up in the fuel tank, forcing the fuel out.
Old 08-02-03, 07:09 AM
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Hello Ken

Although one would not expect seeping to occur, the fact of the matter is it can and does happen. One possibility is the machine is not stored level.

Try storing the machine in a level plane if not doing so now. If the problem does continue to happen, than there could be a slight amount of pressure in the fuel tank forcing out fuel into the carb.

If the condition remains, open the fuel cap to vent pressure and retest in a level stored plane. If the problem does not happen, pressure is the cause.

If the problem remains, the carbs needle and or seat are most likely the cause. Cleaning, as cheese mentioned, may resolve the problem.

If doing so does not resolve the problem, the seat may not be seated fully, seat or seal is leaking or a part is bent or out of adjustment, etc.

Check and clear the air intake vent hole on top of the carb bodies upper half. The hole is extremely tiny but must be opened. It allows air to enter the carbs diaphram area. All carbs have one.

Use canned pressurized carb cleaner to do this. Place the plastic tube into or up against the opening and allow the pressurized canned cleaner fluid to clear the opening.

Use EYE PROTECTION during this procedure.

Regards & Good Luck.
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