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Old 11-21-2010, 11:45 AM   #1
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no power to fuel pump

hey first time posting and really need some help,

my 1998 jeep wrangler will not start there is no power going to the fuel pump so we replaced that still would not work engine turns over fine but wont start. then randomly it worked for about two months and stopped again got it home by putting a little fuel in the throttle body and it started up and ran for about a week again with no problems then stopped all together can not get it running not. fuel pump still not starting so i tried moving the horn ASD and fuel pump relays around in different combinations still will not start any ideas?

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Old 11-21-2010, 11:53 AM   #2
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The fuel pump is under control of the ECM (engine computer) and if the ECM is not 100% happy with all of its inputs like from the camshaft or crankshaft position sensors, it will disable the ASD relay which disables the fuel pump relay. I'm betting the ECM is not happy at times which is disabling the fuel pump. I'd start checking your various sensors, especially the crankshaft and camshaft position sensors.

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Old 11-21-2010, 11:55 AM   #3
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ok sounds good my dad is on his way here with a bunc of stuff to work on it im suck at school till we get it running we will replace the relays and check the CPS when he gets here
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Old 11-21-2010, 12:00 PM   #4
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Also forgot to mention that when it is running and i hit a big bump the tac and speedo will both cut out and read zero and the airbag light will come on for a little then things will go back to normal not sure if that has anything to do with this but figured i would put it out there
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Old 11-21-2010, 12:37 PM   #5
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sounds to me like it could be a ground problem. just my 2cents hope ya figure it out...
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Old 11-21-2010, 12:40 PM   #6
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Quote:
Originally Posted by panzer View Post
ok sounds good my dad is on his way here with a bunc of stuff to work on it im suck at school till we get it running we will replace the relays and check the CPS when he gets here
Those relays seldom go bad and that you've already swapped them around which didn't change anything confirms they are not the source of the problem. I wouldn't spend any more time on the relays themselves.
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Old 11-21-2010, 12:42 PM   #7
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ok sounds good he is bring up a CPS to change that out and we will see what happens
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Old 11-21-2010, 02:24 PM   #8
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so when my dad gets here he checks up behind me and switches the AC relay with the fuel pump relay and it starts right up. I had tried switching the horn relay with the fuel pump and it would not so my dad is driving the jeep home right now. could it still be the CPS or could it be the relay box itself?
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Old 11-22-2010, 03:46 AM   #9
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About 3 weeks ago, my 99 tj started to occasionally die as I was driving. Usually, after a minute or two it would just start back up. Then it died on my way to work one afternoon, and wouldn't start back up. I did some checking, and it turned out to be the crankshaft sensor. It was an inexpensive and easy fix, and has since been working perfectly. I'm not sure if that is the problem you are having, but it could be something to check.

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