SOHC.co.uk Forums > CB500/550

Fuel draining but carbs not overflowing

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Outrunner:
If I have an auxiliary fuel fitted with the main tank off. If I fill the auxiliary tank it drains to fill the carbs, but continues to drain somewhere until the tank is empty, adding more fuel it continues to drain, the carbs are not overflowing.

Has anyone experienced similar and fixed the issue?

Orcade-Ian:
It goes without saying that you MUST NOT crank the engine, either with the electric or kick starters until you have found the problem - doing so could land you in a whole heap of trouble.  The fuel has only 3 possible routes if the float chamber screws are not leaking, out through the overflows (you have discounted those) upstream back into the plenum chamber (that should have a drain anyway) or downstream through an open inlet valve and into the engine and thence via the rings into the sump oil.
Has the oil level risen in the sump?  Can you smell this missing fuel?

Ian

Outrunner:
Thanks Ian, I'll take a look on Saturday

deltarider:
Make sure your fuel supply - whatever it is - is not higher placed than where your tank usually is. Float needles can not withstand the extra pressure.

Outrunner:
Carbs have been removed, flushed and refilled while on a bench, angled 2.5 degrees forward as per when fitted on the bike, and they are not overflowing/leaking.

While the carbs are out, stripping the head and barrels to have a look in there too

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