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Fuel pump diagnosis

Vehicle wont crank, turn switch on, hear studdering sounds from fuel pump.it also back fires. is it the pump or relays?

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  • Boris Moody Feb 18, 2012

    1997 olsmobile silhouette van

  • rduffy183
    rduffy183 Feb 18, 2012

    Timing belt or chain blown or skipped. My first guess.

  • rduffy183
    rduffy183 Feb 18, 2012

    ......and also - you're battery is dead or low. Check all belts. Alternator is a suspect too.

  • Josh Canaday
    Josh Canaday Feb 19, 2012

    just beware all the "know it all's" online.. the year and make will help. but refer to my earlier post and get back to me. need to know does the egine turn over jsut fine but not fire? as in posted earlier if your engine doesn't turn over then you have other issues. if it does turn over and you hear "shuddering" noises from your pump then your looking at either your pump, filter. or relay (a clogged filter could cause your pump to reverberate or cavitate). anyways post back and let me know if your engine actually turns over. and i can walk you through this issue

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  • 444 Answers

Vehicle wont crank? you have other issues. if it cranks but wont start then we may be looking at a fuel pump/relay/pressure regulator issue. the easiest way to test this is to simply buy a new relay( they are usually pretty cheap) or find a simular relay in your junction box or elsewhere, such as an a/c relay and switch it out typically if it fits it will suffice. how ever when they go out they usually go out completely. i would start by testing your fuel filter. remove it and try to blow throw it. if its good you should easily be able to pass air through it. if you cant or it seems restricted then replace it. if the studdering sounds continue after checking and replacing the filter and relay (both cheap parts, i dont know the year make and model but you should be able to replace both for around 30-40bucks) then its definitely your fuel pump and they typicaly run upwards of 100-400 bucks. and are a pain in the **** to replace as they are in the tank. just a side not some vehicle dont have and in line fuel filter, they have a "sock" on the pick up in the tank (jeep cherokee for example) other cars are well known for thier pumps going out around a certain mileage. let me know the year make and model and i can help walk you through the problem.

Posted on Feb 18, 2012

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Posted on Jan 02, 2017

DAD5bbbbg
  • 111 Answers

SOURCE: no power to fuel pump

What you need to do is drop the fuel tank and put a new fuel pump in it. I would drain the gas and put new gas in after you get the pump changed.

Posted on Mar 26, 2009

rcampsr
  • 90 Answers

SOURCE: Do you know where or if a 2000 Mazda 626 has a

Hello, I am going to make a few assumptions here. The vehicle has an electric fuel pump and you replaced it. The vehicle has fuel injection. The engine is actually cranking, just not starting, when you say "car still won't crank". You are getting fire to the spark plugs at the plug ends. You checked the fuel pump for power at the pump. No power, then you back traced the wire to the fuse block and checked the fuse to see if it was blown. If the fuse is good back trace the power to the ignition switch and/or ECM for power. You have power at the pump, check the ground and make sure it is connected properly. Will the pump run when someone turns the key on? Pump runs, check fuel manifold for pressure. No pressure, check the fuel filter for blockage, or replace it. Fuel pump doesn't run, new replacement pump is defective. There is usually some type of control module for the fuel pump on fuel injected vehicles. Good Luck, RAC

Posted on Apr 18, 2009

  • 1 Answer

SOURCE: 1993 Jeep Grand Cherokee Fuel Pump?

Between 100-140 thousand miles the fuel pumps go out on the 1993 cherokee. Its a fact. All parts are manufactured with the knowledge that it will last for a specific period of time then it dies. The relay switch was helpful for a brief while because there was still some juice in that pump, but now that it is gone it is gone.

If you don't see the fuse box under the dash in the driver leg area or beneath the radio check for a covered box under the hood. There should be a fuse spec guide on the lid of the box that tells you where specific wattage should go and for what purpose. But, your fuel pump problem will not be solved by a new fuse.

Posted on May 25, 2009

tommyboinow
  • 324 Answers

SOURCE: fuel pump relay 2002 Jaguar x-type 2.5

in the mass fuse box, under the dash, unless you have the manual you will not beable to tell wich one it is.. get a chiltons repair manual or a haynes...

Posted on Nov 26, 2008

  • 3600 Answers

SOURCE: cranks but won't start fuel pump not coming on

put a small amount of fuel in the intake near the throttle plate then crank and see if it fires, if it does then it's a fuel problem, if it does not fire then pull a plug wire and put a philips head screw driver into the plug wire hold it 1/4 inch away from a good ground then have someone crank it over, you should see spark and it should be blue, if not then you have a ignition problem a bad coil or cam sensor but need to know what you found out on the two tests I told you first to give you a direction to go.

Posted on May 29, 2009

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