Jeep will turn over but wont start, just replaced fuel pump - JeepForum.com
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Unread 05-08-2013, 12:30 AM   #1
huntley1110
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Join Date: Dec 2012
Location: cf, ia
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Jeep will turn over but wont start, just replaced fuel pump

so i should have came here before i went and spent money that i might not have had to... but.

ever since i got my jeep ive had to let it turn over 3-5 seconds to start it, and this weekend i got up to go to work and it wouldnt start.. let it set for 15 min and it took a bit but it started....

worked fine all weekend after that, then on monday it took a crap again and wouldnt start this time, i could still hear the pump continuesly buzzing before i turned it over

I just spent my whole night putting in a pump and its still doing the same thing. Im not much of a mechanic and i am stumped at this.

any help would be amazing guys. Thanks!

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Unread 05-08-2013, 01:10 AM   #2
SAR-Swimmer
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1997 ZJ 
 
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Location: Mission, B.C. Canada
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Yeah, any help WOULD be amazing ! Not trying to sound like a jerk; but PLEASE fill in your jeep profile, so we know what you have. It's very hard for us to help you, if we know nothing about your jeep, such as year, engine size etc
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Unread 05-08-2013, 01:27 AM   #3
AaronButler
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1996 ZJ 
 
Join Date: Sep 2012
Location: Phoenix, AZ
Posts: 151
^^

Generic things you can check:
fuel filter
see if you have fuel pressure by pushing in the bleeder valve on your fuel rail
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Unread 05-08-2013, 01:39 AM   #4
just_urd
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1998 ZJ 
 
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If it's a 4.0, 3-5 seconds was normal for my old XJ to finally fire up, could be wrong if that's normal. But as ^^^ stated... Lots of people here to try and help.
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Unread 05-08-2013, 02:04 AM   #5
Oldfrog
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1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
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3-5 seconds isnt really normal for my 97 4.0. It turns over maybe 3 times and starts almost immediately.

If the fuel pump is humming constantly, that's not normal. I'd first try swapping out the fuel pump relay with the horn relay in the PDC ( that the fuse box under the hood) If it's a 4 litre engine ( the 6 cyl), those relays in there are all the same on a 96, as I recall. If it doesnt help, then it's something else CAUSING that relay to stay engaged....subsequently...the fuel pump is still running. I'm sure some of the guys here will know what else to check if that's the case.
Or you could do a search for the topic.

Meanwhile, help us to help YOU, by filling out your Jeep info on your profile.
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Unread 05-08-2013, 01:33 PM   #6
huntley1110
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**** im sorry guys. i wrote this at 12 last night after working all day and 6 hours of doing that pump. its a 1998 gc laredo 4.0
and yes is is constantly humming, so i guess i will try to switch the relays around and go from there
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Unread 05-08-2013, 02:18 PM   #7
jm8881
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1996 ZJ 
 
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Aftermarket fuel pumps are usually of poor quality. Airtex, carter, and bosh (three main brands you'll find at autoparts stores) are terrible. Check your pressure at the fuel rail before going any further.
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Unread 05-08-2013, 02:26 PM   #8
Scopez
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Quote:
Originally Posted by huntley1110 View Post
**** im sorry guys. i wrote this at 12 last night after working all day and 6 hours of doing that pump. its a 1998 gc laredo 4.0
and yes is is constantly humming, so i guess i will try to switch the relays around and go from there
Any chance there's a jumper wire on the fuel pump relay? The PO decided to do that and it caused alot of my running rich issues. It still started fine, but once I removed jumper wire, it ran alot smoother.
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Unread 05-08-2013, 04:33 PM   #9
dellis
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1998 ZJ 
 
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Quote:
Originally Posted by jm8881 View Post
Aftermarket fuel pumps are usually of poor quality. Airtex, carter, and bosh (three main brands you'll find at autoparts stores) are terrible. Check your pressure at the fuel rail before going any further.
Yes, fuel pressure should be the first test to do. But, Bosch is the OEM supplier ... the Bosch I put in had Chrysler/Mopar labels on it.
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Unread 05-08-2013, 04:40 PM   #10
jm8881
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Quote:
Originally Posted by dellis View Post
Yes, fuel pressure should be the first test to do. But, Bosch is the OEM supplier ... the Bosch I put in had Chrysler/Mopar labels on it.
Unless you bought it from the dealer it more than likely is not the same as a dealer part.

Bosch parts you buy in a place like Autozone or Advance Auto are much cheaper quality.
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