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Unread 05-15-2010, 08:31 AM   #1
mummert90
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1998 ZJ 
 
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Fuel Pump Question

Is there anything other then a wiring issue that will prohibit the fuel pump from priming when the key is turned?

I've been having some issue's with my 4.0L 98 Grand Cherokee. At first I just had trouble starting it. Would turn over fine but not start. I could hear the pump kicking on like it should. Changed the coil, crank position sensor, cap, rotor, wires, and plugs. Everything finally seemed back to normal and I drove the Jeep for a week. I filled the tank up one day on the way home and made it a couple blocks when the engine just died and would not start back up. Turned over fine, but this time I couldn't hear the fuel pump coming on. Went back a couple hours later and it started right up.

Haven't driven it much since, it did die again on my wife just backing out of the parking lot-same deal no pump. I can go out and start it right now but something somewhere is definately going out. I assumed the pump being a electric motor would either come on or not-can they act up intermittently (other then a wiring issue)?

On a side note, the fuel gauge cuts out a lot-has since the day we bought it 6 years ago. Just wondering if it might be a wiring issue since the pump and sending unit are there together.

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Unread 05-15-2010, 09:10 AM   #2
ZeeJay1997
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You can swap the fuel pump relay out with another relay that doesn't work as hard, like the intermittent wiper or horn. Or you can splurge and go to NAPA and get a new one and stick it on to see if it helps. They are around 15 bucks.

Also, when it will not prime, go back to the bottom of the fuel tank and give it a good whack on the flat part to see if the pump kicks in. If it does, there's your sign.
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Unread 05-15-2010, 09:15 AM   #3
ZeeJay1997
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Quote:
Originally Posted by mummert90 View Post
the fuel gauge cuts out a lot-has since the day we bought it 6 years ago. Just wondering if it might be a wiring issue since the pump and sending unit are there together.
AH! didnt read it all....

Clean the plug back at the fuel tank. If you are good with a meter, check continuity to ground at the chassis side of the connection for ground to frame. It will be a black wire, maybe with a stripe.
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Unread 05-15-2010, 09:18 AM   #4
mummert90
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Yeah I switched the relays around already with no effect. I'm going to replace them as well today just to make sure.

Thanks for the reply, wish the thing would just break down for good so I could stop throwing parts at it.
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Unread 05-15-2010, 09:21 AM   #5
ZeeJay1997
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I know what you mean, I drove mine to Atlanta this week, quit running twice. Both were intermittent connections.

Zip ties are my friend.
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Unread 05-15-2010, 09:37 AM   #6
mummert90
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Quote:
Originally Posted by ZeeJay1997 View Post
AH! didnt read it all....

Clean the plug back at the fuel tank. If you are good with a meter, check continuity to ground at the chassis side of the connection for ground to frame. It will be a black wire, maybe with a stripe.
I can do that no problem-thanks.
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Unread 05-16-2010, 10:22 AM   #7
mummert90
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Well it's not the fuel pump...well I mean it's not working, but so is a lot of other stuff. Time to see If I'm getting voltage to the PCM and or power distribution center.
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Unread 06-09-2015, 07:15 AM   #8
sweetie71
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I have no brake lights on either side,,but I do have signal lights on both sides front and back and my four way flashers work in both front and back, what can I do to make them work ?
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Unread 06-09-2015, 08:31 AM   #9
PolkaPower
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A tired cam shaft sensor can cause stalling. After it totally fails there will be no spark and you won't be able to start it at all.
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Unread 06-09-2015, 06:34 PM   #10
ZeeJay1997
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and a broken vacuum line can cause the air to blow out the defrost vents
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Unread 06-09-2015, 07:35 PM   #11
coralman
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A 98 breaks down? You got to be kidding. A simple first check on your lights would be to check for corrosion or burnt sockets/ bulbs.
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Unread 06-09-2015, 08:15 PM   #12
wingless
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What is the fuel pressure measured on the fuel rail?
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Unread 06-09-2015, 08:25 PM   #13
ZeeJay1997
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the OP posted 5 years ago... then someone made an off topic bump... now it's a cluster.
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