Re: fuel system case study #1`

Posted by fred kanter On 2011/6/1 18:13:53

To cortcomp

This is not at all similar to the situation with bikes as you describe. On the bike, the carburetor needle valve leak is, the fuel overflows the carb when the bike is parked, fill a cylinder , leaks past the rings and into the crankcase.

In the car I described fuel enters the crankcase via a fuel pump diaphragm that has a small hole in it. It flows down teh fp to carb line when parked, through the hole nad into the crankcase. Also when the electric pump is on teh entire fuel line/mechanical pump is pressurized and fuel leaks into the crankcase. When just teh mechanical pump is going the same leak occurs.

Completely different scenario.