My 94 cranks for awhile before it starts so I tested the fpr. With the vacuum hooked up it idles at ~31 psi, unhooked ~41. With its hooked up it fluctuates when revved to ~41, unhooked it is steady. I assume I need to replace it? Or could it be a different problem?

 

Your pressure and regulator are OK. Maybe fuel pressure is bleeding off, maybe the check valve in the pump.

Try turning the ign on a sec, then off a few times first and see if that helps.

 

What is the pressure supposed to be?

 

31,+ 8-10 w/o vacuum.

 

Oh. Everything I saw said 39 +/- 5.

 

My renix only pumps gas wen your cranking the motor I found not wen the key is just in the on position do u have any idea why

 

I turn the key twice and it gets up to 10 psi. Still seem slow to start but not as bad. Holds 31 at idle. Shut it off and its back to zero. Bad injector?

 

Or bad rwgulator on the pump

 

So there are two regulators?

 

Sometimes I think Steve is working on his post count. No there is only one regulator and I think yours is fine. I have it that the pressure went up in 96 with OBD II. http://www.jeep4.0performance.4mg.com/tech_specs.html

The "prime" suspect, (ha, ha), is the check valve in the fuel pump. Might be it should not let the pressure drop more than 20 Lbs in 1/2 an hour. Also an injector could leak as well as the regulator, but the check valve is what get's talked about. So...cycleing the key, it never goes over 10?

 

The pump will only run for the first two key cycles. 10 is as high as it goes when cycling the key. Also the oil smells pretty strongly of gas.

 

Really. I haven't done it, but guys have posted that they removed their fuel rail with the injectors on it an messed around looking at flow and for leaking. Certainly something to do with caution, maybe not in the garage so you don't loose the house too!

 

I meant the check valve I just didnt know the proper name

 

According to your link mine is 8lbs below what it should be. Should the pressure fluctuate ~10psi?

 

Then don't post it! Post what you are pretty darn sure of, and if you are not sure, make it clear!

On the injectors leaking....after cycling it, try just turning the key to start it, (no throttle), and see if it misses for a second compared to not cycling it.

The leaking might flood a cyl (or more) and make it miss.