Question about 1997 Chevrolet Tahoe

3 Answers

My sons Tahoe keeps going through fuel pumps. He has replaced the fuel relay, injectors, fuel regulator, and of course 4 fuel pumps. He replaced it again last night and the new one won't turn on. Please help. He has asked different machanices and each one has told him to change the vareuse iteams listed above. What can be the problem???

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  • 9 more comments 
  • r_c_miller Feb 07, 2010

    Wouldnt the ECU also cause other things on the vehicle to stop working as well? He also replaced the wiring harness and filter. THere is no dirt in the tank as we both cleaned out the tank and let it dry for a week.

  • r_c_miller Feb 07, 2010

    we disconnected the battery because that is what is stated to do before working on the pump. To explain what happened this time is he was driving and all of a sudden it completely dies like ran out of gas. He had just filled the tank. The tank had never been lower than 1/2 a tank in fear of it causing to burn up. We traced all the wires yesterday and didnt see anything frayed or broken

  • r_c_miller Feb 07, 2010

    Have a 1997 Tahoe that keeps going through fuel pumps. On #6. On fri I was driving and it just stopped. Fuel pump would not kick on. got a new one, traced all wires to see if any were frayed or badly connected. Nothing. Hooked new one in and didnt work. Have replaced wiring harness, filter, relay, injectors and pressure regulator. There is no carbon buildup by relay. Starting to think something else is going on. Disconnected battery when I replaced pump. Does anyone have an idea on what is going on?

  • r_c_miller Feb 07, 2010

    Traced all the electrical wiring and nothing was broken. I do have one code on right now but that is because my timing is off by one tooth in the distributor, when I replaced the injectors I had to pull the distributor. would that cause my system to shut down, and if that is the case, why did it run for a week before going down?

  • r_c_miller Feb 07, 2010

    Put the new replacement in yesterday and put gas in and it didnt turn on at all.

  • r_c_miller Feb 07, 2010

    The new pump is not kicking on, I did check the pressure when the old pump was in(the one that just went out) and the pressure was in between proper pressure. After I replaced the injectors tahoe was running awesome then heading up a hill it just acted like it ran out of gas with a full tank. Havent had tank under 1/4 since I keep going through pumps. Is there something else that could cause the pump to just stop working and not kick on?

  • r_c_miller Feb 07, 2010

    THanks for all the advice, gonna go n try to see what can happen, when I did check the pressure it was within specified range. I will keep informed n see what happens.

  • r_c_miller Feb 08, 2010

    SO yesterday did some more work and found a fuse was blown. The ECM-B fuse was blown. Replaced with a new fuse and it fired up. ABout 30 min later it blew again. Put another in and as soon as I turned the key in the on position it blew again. Tried 3 times. Even put a 30amp in were it only asks for a 20amp. Any suggestions on were to look to see where a short could be?

  • r_c_miller Feb 08, 2010

    We checked all the wires and yesterday found a fuse was blown, it was the ECM-B fuse up under the hood. put new one in and pump started working. But 30min later it blew again. Out three more in and as soon as we turned the key on they blew instantly. Even tried one that was 10more amp than asked for. We looked at all the wires under the hood that goes to the relay/fuse box and they looked good. Any suggestions of what could be shorting out to cause the fuse to blow that quickly?

  • r_c_miller Feb 08, 2010

    It does have an EGR valve, and I dont have any pressure issues going on, have hooked up to a pressure gauge. The EGR valve is in good working order as well. We checked because we thought that would be a problem as well. Just cant figure out how the fuse keeps blowing instantly

  • r_c_miller Feb 08, 2010

    I did do a match up wiring harness, it was just the pig tail that was replaced. Gonna try to put another ground to the car body from the battery today. MAybe that will work.

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3 Answers

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Hi there

That's a tricky one, tell him before fitting anything else check the fuel pump is getting the correct amount of power, you will need an amp meter, if it is getting to much power or any wires in the system are faulty then it will either over charge or under charge. and more notably it could be very dangerous if any wires are contacting the car body, check around the exhaust and ensure no wires are touching and look for signs of melted wires.

I would also wonder if the fuel is contaminated, drain the tank if you suspect any corrosion in the fuel or bad fuel. Also when changing the fuel filter you must ensure that the filter is drenched in fuel or this will cause air locks in the system did your son completely cover the new filter in fuel?

Lastly as you say the new one is not working or will not turn on, check the rear of the fuse box where the wires come in from the car, again look for melted wires and fuses etc.

The fuel system will need to be at the correct pressure to work properly if there are any leaks in the system at all then it could cause a lot of hassle. so check the fuel lines as well, and one more thing the fuel tank, they can sometimes corrode forcing air in the fuel and then the pressure drops, look around the top of the tank and if any fuel lines run over the top of it where you cannot see then you may need to pull the tank down to investigate.

I hope this helps it seems he has changed everything poor lad, good luck
Regards
Dan

Posted on Feb 08, 2010

  • 1 more comment 
  • Dan Doherty
    Dan Doherty Feb 08, 2010

    Does this model have the EGR valve, "Exhaust gas recycler valve" normally this will force any un-burnt fuel back through the engine but if it is not working then it may be over fuelling or under fuelling. the pressure will back pressure will force fuel the wrong way back to the pump, could cause failure also.

    Regards
    Dan


  • Dan Doherty
    Dan Doherty Feb 08, 2010

    Hi
    Then it must be an earthing issue somewhere, Have you tried a larger fuse size? I would suggest adding another earth wire direct from the battery to the car body, "the black one"! then try the fuse again.

    Also there will be 2 sets of fuses the larger main fuse box and the smaller internal fuses, with that in mind it may be nothing to do with the fuel pump it could be something else on the car causing it to ark somewhere. Like the starter motor, alternator. The wires would not have to be touching but could generate a spark enough to trip the fuse.

    I will see if I can find a wiring graph and get back to you. When you replaced the harness was it a complete match up?
    Regards
    Dan


  • Dan Doherty
    Dan Doherty Feb 08, 2010

    Get back to me let me know how you get on.

    Regards
    Dan


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Really the problem is more of electrical and to be sincere with you all necessary to be replaced has been replaced but I will just advice that you take the car in for a scan which will likely reveal some codes that are error codes and with corresponding meaning that will as a matter of fact lead you to the cause of the problem.

Also, following your car history of having to replace fuel pumps about four times simply indicates that there are electrical malfunctioning that is causing the fuel pump to loose pressure/ power.

See an expert in your location or just visit an accredited service centre.

Good luck and thanks for using Fixya.

Do remember to rate this solution.

Posted on Feb 07, 2010

  • 3 more comments 
  • Titilayo Sodipe Feb 07, 2010

    The one tooth can be the cause wherein it work by forced pressures for a week.

    Consider a replacement first and we see what happens next.

    Get back to me anytime.


  • Titilayo Sodipe Feb 07, 2010

    Have you confirmed that the fuel pump is functioning. Listen to it humm when the key is on start.

    Compare the fuel pump pressure and see that it is okay.


  • Titilayo Sodipe Feb 07, 2010

    The pump can act up if it is not the required rate pressure.

    The new one might have a factory defect. Take it in for a replacement straight-up.

    Sorry for all these stress.


  • Titilayo Sodipe Feb 07, 2010

    Okay but remember to rate this thread of discussion.

    Cheers.


  • Titilayo Sodipe Feb 12, 2010

    Okay.



    Thanks for using Fixya.





    Cheers.

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Good day, everythings been replaced but have you checked the ecu? you may need to replace it and hopefully get your son's car back to normal running. hope this helps, have a nice day

Posted on Feb 07, 2010

  • dj_relly999
    dj_relly999 Feb 07, 2010

    ok, well sir have you tried removing the battery terminals? try to do so for it will reset the system and it might work

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Its a 1999 chevy tahoe. Changed fuel pump twice.


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1 Answer

Fuel pump keeps going out on my 2003 Tahoe...any suggestions?


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1 Answer

1999 mazda 626 6cyl no fuel geting to onjectors


Priority Action Part Type Cause
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2 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
3 Inspect Relay - Fuel Pump Faulty Fuel Pump Relay.
4 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
5 Inspect Fuel Pump Low Fuel Pressure.
6 Inspect Engine Control Computer Incorrect Operating Information Being Delivered and Sent From The EEC.
7 Inspect Fuel Pump Strainer Clogged or Dirty Fuel Pump Strainerat.
8 Inspect Fuel Rail - leaky Fuel Rail

From April 2010? What did the problem turn out to be?

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1 Answer

Have a 96 tahoe 5.7 replaced the fuel pump,harness,filter and relay got it to work again now it isnt getting fuel to the plugs is it possible the injectors have gone bad?


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Advance Auto Part #217-3074 for around $90.
Advance Auto Part #23043 for around $46.
Adavance Auto REBUILD KIT Item #9710 for around $29.
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3 Answers

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1 Answer

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We've been having the same problem with our 1999 Tahoe. We were also told either fuel pump, fuel regulator, or injector. We believe it is the fuel injectors, particularly since reading this:

http://www.arb.ca.gov/newsrel/nr021103.htm


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