What is the fuel pressure supposed to be on a 88 4.0 4wd

[JeepcomancheMJ]

I keep looking every where online not helping. It has 31 psi when at idle. The jeep runs ok. Gives me random sputters and stalls. Biggest issue is its gutless for 4.0.

[ftpiercecracker1]

30psi +/- 1 is where its supposed to be, so your in good shape. When was its last tune up? Its amazing what a fresh tune up can do for the performance.

Are you aware of the CPS and how to test it?

 

If you want to keep your Renix engine happy, do yourself a favor and go through each and every one of these tips.  :thumbsup:

 

http://comancheclub.com/topic/36382-cruisers-renix-tips/

[mvusse]

Supposed to be 31 with the vacuum line hooked up, 37 with the vacuum line disconnected.

[cruiser54]

Supposed to be 31 with the vacuum line hooked up, 37 with the vacuum line disconnected.

39 disconnected..........

[mvusse]

 

Supposed to be 31 with the vacuum line hooked up, 37 with the vacuum line disconnected.

39 disconnected..........

 

Oops, typo. I stand corrected.

[reubj]

30psi +/- 1 is where its supposed to be, so your in good shape. When was its last tune up? Its amazing what a fresh tune up can do for the performance.

Are you aware of the CPS and how to test it?

 

If you want to keep your Renix engine happy, do yourself a favor and go through each and every one of these tips.  :thumbsup:

 

http://comancheclub.com/topic/36382-cruisers-renix-tips/

Absolutely do everything on the list and install 4-port injectors. Mine runs like it's new since I did these.