SOHC.co.uk Forums > CB750

Leaking Petcock and Carbs

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Oddjob:
The screws holding the petcock in position go into the tank, so fuel seeps down them but is supposed to be stopped by the fibre washers from entering the bowl, if the washers leak it means fuel is getting into the bowl even if the fuel tap is closed, hence why it’s a drip and not a flood.

Bryanj:
The bowl is after the 4 hole rubber and tap in the direction of flow

ColinHH:
Bryanj,
When I was referring to the bowl,I meant the bowl at the bottom of the petcock, not the bowl on the carb. The bowl on the petcock (where I think the fuel would flow into from a leak from the two screws) is before the 4 hole seal isn't it? I will check the washers tomorrow though and see how it goes.

Bryanj:
I was talking about the bowl on the tap and its after the seal with holes, trust me i found the problem 30 yrs ago

Trigger:
We are on about the bowl on the fuel tap. If the washers are not sealing correctly then, the fuel is bypassing the fuel rubber and running in to the bowl so, it doesn't matter if you have the fuel tap turned off  ;)

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