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Old 10-13-2015, 06:03 AM
Rick in Yuma's Avatar
Rick in Yuma Rick in Yuma is offline
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Location: Arizona
Join Date: Dec 2006
Posts: 1,557
Mein Auto: 05' 760li,94' H1,08'Smart
Originally Posted by Evren View Post
Hi dear I don't have a leak on the pump cap but a lot of fuel coming out of number 2 vent hose above when engine off but other side is nipple is okay .do u guys change diaphram only if u have fuel coming out of caps or what?
The only time you need to replace the diaphragm is if you have fuel coming out of the vent pipe. On the top of the pump. But make sure the fuel is coming out of the pump and not traveling to the top of the pump from the vent lines.Several items can fail in the system that will cause fuel to enter evaporative fuel vent system. Pull the vent lines off the top of the high-pressure fuel pump's. Start the car, if you have leakage from another area, you will have a small amount of fuel come out. The fuel that settled on top of the diaphragm. However if it stops then you have fuel leaking from somewhere else getting to the top of the diaphragm not coming from under the diaphragm. (On the pump side of the unit) If you have fuel coming out continuously then the diaphragm is bad.
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