Fuel pressure

[Geauxtigers]

I have a 2002 TJ 4.0 that when I turn the key on, fuel pressure stays at 0. When trying to start, sometimes it will take 2-3 cranks and other times it will start up on first try. While running my pressure is around 52PSI. Immediately after shutting it off, the pressure goes to 0. Am I supposed to hold pressure for certain amount of time? Also should I be building pressure when just turning the key to prime? And how much? Fuel regulator issue?

 

[macleanflood]

Check valve in the fuel pump assembly is bad.

You can replace the entire pump assembly or the pump...I believe the check valve is in the pump and not the pressure regulator.

V

Thread 'How to replace your fuel pump without replacing the whole assembly'

Dec 21, 2021

Ok, I figured I'd post this here since I haven't seen it anywhere else. I've been chasing a hard start issue on my tj and got down to the in tank pump. I knew the sending unit was still good, but wanted the peace of mind of having a new pressure regulator and pump. I also didn't want to fork over ~$200 for a new assembly when I knew I could find a pump and regulator for much less. I didn't take pictures during the process because I'm a dumba$$ and this was the last thing I did on a Saturday so I was ready to be done. This only applies for 97-04 TJ's I believe. Assuming you've managed to...

• vrtillman
• Replies: 22
• Forum: TJ How-to Guides

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-Mac