ok so i go out to start my car and i dont hear the humming noise of the fuel pump turning on when i turn the key, and of course the car wont start. i use a voltmeter to see if i have power to the pump, and i do. so my old american car knowledge tells me the fuel pump is no good. the dealer replaced one at 45k and now im at 90k so i think "ok i guess these things only last 45k" and i go get one from the dealer. wow these things are $400, but ive never been able to change a fuel pump in 15 mins before. wow this trap door thing is great. turn the key and still no humming noise. if anyone has any ideas id really appreciate some help. thanks
oh yea and i guess i might have a fuel pump relay, but if i do its not marked. autozone will sell me one, but my local import parts store says my car doesnt have one??????
2002 sentra specv
Last edited by lvspecv; Aug 14th, 2009 at 05:12 AM.
you can always unhook the quick connect part of the fuel line (thats located off the firewall on the drivers side). turn the key on for a split second and see if anything comes out. If nothing is coming out, then your pump is not working.
There should be a pump relay somewhere. Check owners hand book for location. Or might be as simple as bad earth on pump. Try earthing pump with jumper wire. Be careful that you relieve fuel pressure before disconnecting fuel lines and be extra carefull running pump with line off [big fire risk]!
Aussie 1986 N12 PULSAR 24 years,250000km one owner, still going strong!
Last edited by pulsar86; Aug 14th, 2009 at 06:10 PM.
Well Dont try to start the car with an end disconnected. You only need to rock the key forward for a split second. Have a buddy watch the hose to see if any fuel comes out (stand back so non get in your eyes), just a split second should cause a gush, i know its the backyard way of doing it, but its simple and fast.
I wish somebody has a wiring diagram for the fuel pump.
I get 11.7v from one wire and 4.8v from another while the key is forward.
I figure the two black wires are grounds.
Just wondering what the other wire is for.
well thanks for the suggestions guys, but i brought it to the shop. now i dont feel so stupid cuz the shop says all signs point to a bad fuel pump, but thats not the problem. they've been on the car all day and they cant figure it out either. all they said was maybe the computer is bad, they want one more day to diagnose but said ill probably have to take it to the dealer. that shop its at specailizes in toyota, anyone know of a good nissan tech in las vegas?
ok first of all... the stock fuel pumps suck cock :-| just to put that out there. everyone I know with a spec v has had an issue with it. replace it asap ... you will start to have more an more problems with it... I replaced mine when I bought my car because i was having the same problem as you. car would stall when starting... wouldnt start... would put out on me... same shit... 100 bucks for a 255walboro pump ... throw that shit in... promise it will make ur life a lot better.. no more sitting in a parkin lot havin people lookin at u like wtf what a pos... its not none of the connectors or nothing they are just shit... period. my buddy did the same thing..replaced his with the stock one at the dealer.. for a few hundred an had the same problem about 20,000 latter... good luck bra
I'm in a similar boat with an '04 2.5L Sentra.
The pressure regulator was leaking causing start up issues, especially after sitting for more than 30 minutes, especially on a hot summer day. It would only hold pressure for about 15 seconds.
I replaced the fuel pump module, which worked great for a few days, and now I think this one is leaking too. The new one is an airtex pump module, I still need to test it and confirm :mad
For you experts, what are the fuel "rest" pressure specs?
Ie: how many minutes above how many psi?
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