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Noisy fuel pump


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having a small issue with my fuel pump, it works fine, but gets noisy if the car is sitting ticking over after about 30 seconds, but if you drive, it's fine.. It sounds  like it's backing up the pressure or something..! I am running a c20xe on throttle body's with a fuel pressure valve at the end of the rail.. The fuel pump is at the back of the car on the under side. The pump is a standard one you would put in a Sri cavalier etc. I am on my 3rd pump and all 3 have done the same.. The power supply to the pump is just switched threw the ignition and is not on a relay. Not sure if that would effect it.. Anyone else have this problem..!!


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