How do you go about testing fuel pressure? I am going to help my buddy that is having some issues with his C5 and this was one of the things that we were going to perform in attempts to finding the issue.:thumbsup3:

If you don't have one, buy or rent a fuel pressure gauge. On the driver side, at the end of the fuel rail ( right behind the alternator, and under the fuel rail cover) there is a cap with a schrader valve fitting that you can hook your fuel pressure tester to.:thumbsup3:

If you have a set of old R12 air condition gauges, they will work too....

If you have a set of old R12 air condition gauges, they will work too....

I didn't know that and I have a set of them in my garage. Guess I will keep them afterall!:sm_party: