I have had my 96 for a month now and in the last 2 weeks have blown the fuel hoses on the fuel filter and both of the factory flexible hoses that connect to the lines near the engine. Someone put a check valve in the fuel line near the gas tank to prevent the gas to drain back when shut off, I am removing that to see if this problem will cease or cause another one. Am I correct in thinking this was not a factory valve?

I am also now finding out that the 96 seems to be the only one with a fuel regulator attached to the in tank pump and is very hard to find and more costly then any other pump.

Thanks
Mike

 

Yeah, the 1996 was a bastard child transitioning from old to new technologies. Fuel pressure should be around 50 psi, I believe. You can check with a gauge on the fuel rail in the engine bay.

The check valve should not be there, and I don't know what the previous owner was trying to fix with it. You are correct with the fuel pressure regulator being part of the sending unit in the tank. You can buy a used one if you need it by calling JY or looking online at

car-part.com

I think Quadratec sells a new one, but it is expensive. Before you buy anything try to diagnose the problem by getting a reading on fuel pressure before you remove the check valve and after.

 

I have checked the fuel pressure and it was 50 while running. It stayed there with the engine off since the fuel could not return to the tank. I removed the check valve in the fuel line. Pressure is still 50 while running but drops off within a minute to zero.

Engine will start but it takes longer since fuel has to be pumped back up from tank. I have seen the pump from Quadratrac, would this fix the long cranking times? Also is it a quality pump as far as longevity? Did my pump have an internal valve in it so the fuel would not bleed backwards and maybe it has failed?

Thanks.................and Merry Christmas to all !!!!!!!!!

Mike

 

You mean when you turn off the Jeep? If so, yes, pressure does drop once the pump is off, but the fuel should still be in the line.





The big, orange plastic head in the sending unit is the pressure regulator and I would guess also acts as the check valve (I say guess because the FSM doesn't mention this sending unit specifically).

If you are getting 50 psi, then the regulator may not be your issue. I would look at the quality of the hoses that burst. How old were they and were they the correct fuel hoses? I had replaced the fuel hoses on the filter a few years ago and then 2 months ago one starts leaking. I pulled the filter and the hoses only to realize I had used the wrong hose type - the Autozone sales person had given me 3/8 hose for transmission fluid instead of a hose rated for fuel. Stupid me, I didn't check.

So I got 4 feet of the Gates Barricade fuel injection hose at NAPA. No issues since then.

 

Yes pressure gauge goes to zero within one minute after jeep is shut off. Now when I start it she acts likes it out of gas. I need to cycle ignition 5 times to reprime the line. I removed the check valve which held the gas in the line because it not only burst the filter line but blew off the plastic heat shrunk lines near the engine at different times. Need to find out more on this Crown replacement unit on how good it might be. Seems this is the way to go and just replace it all.

 

Before you go and drop all that money on a new sending unit, I would rule out other problems first. If you turn the key once, what fuel pressure do you get?

Also, there are many electrical gremlins that will make it hard to start the Jeep. Like an old battery, dirty battery connections, old battery wires, and maybe even your grounds.

I guess what I am saying is before you drop the cash on the sending unit, make sure it is the sending unit. Because if you keep throwing parts at it, it is going to get expensive.

I had to change my sending unit a few years ago and it was a PITA.

Good luck.

 

i saw a thread where the guy bought the fuel regulator from another year, because 96 is not serviceable, and he opened the fuel assembly to replace it. that's if the problem is the regulator though, so just keep it in mind

i dread the day i need to look into this, thankfully my gas tank was replaced recently so it shouldnt be too rusted. out of curiosity how many miles does your xj have?

 

Jeep sat for 24 hours and was not started, I went and turned the key on and off 6 times. I did not try to start it. Each time key was turned on I could here the pump come on, when I hit the 4-5-6 time I heard the pump noise change like it was pushing harder. Then it started right up, doing the key like this got the fuel back to the engine.

All the fuel hoses are new and injection rated with injection style clamps, the battery is a year old and very strong. Jeep turned 158,000 today. I did a Carfax on it when I bought it and I believe it to be the true miles.

I have found a new fuel pump with the fuel pressure regulator on it. Going to run the gas out of her and pull the tank. Then I can remove the pump and make sure the one I found will fit properly. I think it would be easier to pull the tank then try and do it while installed, also the tank is new from previous owner so it has been out already.

 

I guess I question why it takes 4-6 times of turning the key to get the fuel to the injectors. Whenever I have the fuel line drained, it only takes 2 turns to prime the fuel to the injectors.

So either the actual pump on the sending unit is malfunctioning (which it would do more often and not just on start up) or there is an electrical gremlin in the wiring to the pump. Or there is something wrong with the sending unit, in which case you need to pull it and inspect.

It's a crappy job dropping the gas tank, especially getting the filler hoses back on and the clamps tightened. Expect to find cracked filler hoses, so be ready to order new ones. When I did mine, I took the opportunity to treat all the rust spots with acid and then painted the entire tank.

Good luck and let us know how it goes.

 

I received my new fuel pump from Quadratec last week. I was able to get it back together yesterday even in 20 degree temps in my garage. Did not want to use the heater and blow myself up. It works fantastic, Jeep starts now on the second crank. Just like my old 91 did. Put 70 miles on it today with no problems at all. Only thing I noticed was the gauge read 1/4 tank when I knew it was very close to empty. I filled it and it took 18.5 gallons and it went to the full mark. I will see what happens as the gas gets used. I will also call Quadretec and see if they have an answer, I know I did not bend the float rod.

Even though the pump was expensive for the 96 I am extremely happy of the results.

 

Nice, glad it worked out. Working in the cold sucks. Good job.

 

On inspection of the old sending unit, did you notice anything unusual that may have caused the issue?

 

I did notice that the pump itself had been replaced at one time. The rest of the unit looked very old and some rust was even on the metal of the unit. My guess it was the original. The tank I have now is new so I should hopefully be good for a long time.

 

You may want to keep the old unit just to cannibalize it for parts in case you need it in the future.

Thanks for the update.

 

Did you buy the entire fuel pump assembly? If so, would you link the one you bought there just for future readers of this thread?