fuel pressure woes

Jan 25, 2007 1 Replies

A couple of months ago, I noticed that my 97 TJ would talk a long time to start unless turning the key to on a couple of times because I was losing pressure in my fuel line. I replaced the fuel pressure regulator, and everything was fine again. Everything was perfect until a month and a half later, and now I am experiencing the same thing-I am losing fuel pressure. I attach the meter to the fuel rail and it reads



49 PSI at idle (which is good), but then when I shut it off the needle moves from 49 PSI to zero in a short period of time. Could this be that the part I bought (from Mopar) was defective, or that I have a new problem?

Thanks Mike



Could be, or it could be the check valve in the fuel pump. The probem is hard to diagnose. Usually if you measure rail pressure with the engine running, then disconnect the vac line to the regulator, the pressure should go up 4-5psi if it doesn't or fuel runs out then the regulator isn't working properly.

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required