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Old 01-02-2011, 03:53 PM   #1
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my jeep wont run with a fuel filter on

hello i have a 89yj with a 6cylinder, i jsut changed the gas tank because the previous one had a hole in it. the truck will not run if i put a fuel filter on it. it runs perfect without it though. i have tryed different types of filters and all of them are clear of garbage. all the lines are clear. i am thinking that there isnt enough pressure so the fuel filter is restricting the gas soo i changed the pump and the same thing is still happening. any ideas would be greatly appreciated thank you.

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Old 01-02-2011, 04:34 PM   #2
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scratch that it kind of runs good on and off its really random, it waits till im far away from my house to stall out,

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Old 01-02-2011, 04:43 PM   #3
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Sounds like a lack of fuel pressure. Or a possible vapor lock.
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Old 01-02-2011, 04:47 PM   #4
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yes i know its not getting fuel, i am just unsure as to why. i blew out the lines wit the cap off and ended up with a lot of gas on my driveway, the fuel pressure just drops off randomly and i cant figure out why. i dont think i am that unlucky that i got 3 defective fuel pumps. and this only occured since i changed my fuel tank
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Old 01-02-2011, 04:49 PM   #5
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What about your gas cap?
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Old 01-02-2011, 04:52 PM   #6
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does the same thing with the cap on or off. yesterday it was driving all over the place no prob without the filter and today it wont
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Old 01-02-2011, 05:02 PM   #7
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What about electrical connections at the pump?
You said it yourself, "Ran good till I replaced the tank"
So, follow the steps you did when you replaced the tank, only in reverse. Start looking at everything closely. Could even be a bad ground.
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Old 01-02-2011, 05:05 PM   #8
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Also, make sure any rubber fuel lines are not kinked or twisted.
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Old 01-02-2011, 05:21 PM   #9
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the pump is a mechainical one mounted to the motor . only electrical thing on the tank is the for the gas gauge and that works perfect. i was thinking it could be a kink or twisst in the hose also, my only prob wit that is that it would most likely either be completely clogged or open not just open and close as it feels
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Old 01-02-2011, 06:04 PM   #10
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sometimes it will drive around for like 20 minutes and run perfect, and then sometimes it will run for 10 secs and then die
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Old 01-02-2011, 07:23 PM   #11
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gonna change the hose that goes from the metal line to the pump, and if that doesnt work ill try an electric pump, and if that doesnt work i might invest in some C4
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Old 01-02-2011, 07:34 PM   #12
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don't know about the C4, I heard that makes 'em run hot!
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Old 01-02-2011, 07:46 PM   #13
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pshh my luck, the jeep will be fine and ill blow a hole in my driveway or have my house burn down
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Old 01-02-2011, 07:49 PM   #14
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Could be the sock filter in the tank. Did you check that? Try blowing back into the fuel line with the cap off the tank. Or remove the suction line at the pump and see if you have good availability to the pump. Should be good flow the size of the line and fill a quart bottle in no time.
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Old 01-02-2011, 08:02 PM   #15
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i changed the gas tank and the sock that was in it was clogged, i dropped the tank and put the one in from the old tank, it isnt a sock its a plastic mesh type thing, as i said before when i blow into the tank it squirts gas out the back when i blow through it, it fills up a gas tank quickly. ive changed the pump multiple times, i just dont know
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Old 01-02-2011, 08:14 PM   #16
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I don't understand how you can have gas all over the place when you back blow into the fuel line to check for a blockage? If any gas leaks out then find that spot, that is leaking and that is your problem.
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Old 01-02-2011, 08:16 PM   #17
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i used a compressor with a FUll tank of gas with the cap off. i blew the air and the pressure shot the gas out of the filler hole
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Old 01-02-2011, 08:24 PM   #18
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That would do it, I was thinking more along the lines of using your mouth. Good thing you had the cap off or you would have the only Jeep around with a 25 gal tank. But seriously a light pressure and check for any gas leaking. Suction leaks can be hard to find.
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Old 01-02-2011, 08:28 PM   #19
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im gonna change that one hose tommorow and go from there, its raining and cold and im not in the mood at the moment
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Old 01-02-2011, 09:47 PM   #20
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If the pump is good, the pickup is clear, lines are clear, then you might have a bad hose, if shot they can collapse from suction internally and you might not even see it.
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Old 01-02-2011, 09:54 PM   #21
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i remember in the past i had my steering crushed one of my hoses and i used a pair of plyers to uncrush/open it up. i am sure that it recrushed and i am going to replace that tommorow and hope for the best.
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Old 01-02-2011, 09:57 PM   #22
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Yeah that would do it, the inner liner probably separated and is collapsing.
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Old 01-02-2011, 09:58 PM   #23
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is it venting? Pull the gas cap off and see if it runs fine then.
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Old 01-03-2011, 02:32 PM   #24
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i changed all of the rubber hoses front to back. everything is clear i can blow through it with my mouth no prob. it is still doing it i am completely confused. i tryed driving with the cap off and everything and it still does the same thing. i am gonna bypass the mechanical pump with an electric pump and if that doesnt work i might actually let a mechanic touch it
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Old 01-03-2011, 03:24 PM   #25
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With my 89 4.2 when it would die randomly it was electric. The Ignition Control Module was going bad. Had the same symptoms that you have.
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Old 01-03-2011, 03:27 PM   #26
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i have a HEI containted ignition system and i am positive it is the gas. i put a clear gas filter on it and i can watch the filter dry out and then the truck dies
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Old 01-03-2011, 03:38 PM   #27
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Quote:
Originally Posted by 89JEEPYJ View Post
i have a HEI containted ignition system and i am positive it is the gas. i put a clear gas filter on it and i can watch the filter dry out and then the truck dies
I wonder if there are air pockets in the line...
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Old 01-03-2011, 03:52 PM   #28
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ive blown them out multiple times and ive tryed many diff kinds of pumps. i would think the air pockets would get them selves out, is it possible it could be a carb problem, the carb clogs and then doesnt let air go through and then it appears like the gas runs out
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Old 01-03-2011, 04:17 PM   #29
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i have left the truck idleing for about 20 minutes so far, sometimes when i watch the filter bowl start to run out of gas i shake a hose and squeze it and the filter fills back up again. i really am confused on what is occuring
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Old 01-03-2011, 04:55 PM   #30
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There are 2 different types of mechanical fuel pumps for an 89 4.2; one has the outlet to the front and one to the rear based upon whether your vin has an M or T in it. However, I still don't think that would cause your problem but it's possible. If everything was fine prior to the tank being replaced I don't think you can rule out that there is a problem with the connection/mesh sock inside of the tank. Since you replaced everything it still seems that the fuel pump can't pull enough for an extended period as a result of some type of restriction which could still be in the tank.

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