The vacuum pump has 3 check valves (poppet valves), one to the engine
(exhaust) and 2 from the vacuum system (intake).
If the exhaust poppet fails, your piston or diaphragm will be full of crud
and there will be little vacuum which will take a long time to build up.
Pulling vacuum on the pump from
If you have oil in the vaccum lines either the diaphram in the fuel
shutoff valve is leaking or the diaphram in the vacuum pump is.
Bob Rentfro wrote:
So...if these check valves fail, how do I know? If I'm getting oil in the
vacuum lines is this indicitive of check valve failure? How can oil
Bob Rentfro wrote:
So...if these check valves fail, how do I know? If I'm getting oil in the=
vacuum lines is this indicitive of check valve failure? How can oil get in=
to the vacuum system unless there is a rip in the diaphram? Every other tim=
e the diaphram has ripped I've gotten oil in the
