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jasonf24
12-15-2010, 07:20 PM
dose any one know if there is a check valve built in the sending unit or if it's built in the pump it's self on an 01 a4

weaselciuy
12-16-2010, 02:43 AM
theres a small piese on the left of the air filter, it`s holding by a rubber clip. I know that ticks when engine just started, and it regulates the fuel presure and it cleans fuel vapors before sending back to tank. It ussualy gets clogged with dirt so if it does not tick when engine fresh started maybe thats faulty or needs cleaning.

Its under the palstic cover, witch hides the air filter case.
Hope this is what your trying to find..

offroader1006
12-16-2010, 07:42 PM
theres a small piese on the left of the air filter, it`s holding by a rubber clip. I know that ticks when engine just started, and it regulates the fuel presure and it cleans fuel vapors before sending back to tank. It ussualy gets clogged with dirt so if it does not tick when engine fresh started maybe thats faulty or needs cleaning.

Its under the palstic cover, witch hides the air filter case.
Hope this is what your trying to find..

you are referring to the EVAP valve. this regulates fuel vapor. There should not be any liquid fuel in that line. If so you have a problem.

The check valve is in the fuel pressure regulator iirc.