Gregory Bender

Carburetor vent hole leaks

Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models



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Dellorto VHB carburetors may leak gasoline out of the vent hole. This occurs when fuel has completely filled the float bowl and has no other place to go other than directly out of the vent hole. The flow is typically pretty impressive and evident within just 20 - 30 seconds after turning on the petcock. Obviously, this is a bad situation and one that needs to be rectified before starting the engine.

I start with the basics:

If the leak persists after I've done the basics, I continue with the following: