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  1. #1

    Default Fuel Systems ~ gm fuel pump problems

    I own a 99 GMC Sierra. It has had major fuel system problems for three years now. As I research ways on the internet to fix my problems, I find this is a major GM issue, not specifically related to my model and year.

    Why was there such a major defect for GM owners regarding something so fundamental and dangerous when it doesn't work right? What has GM done to stop this absoulte abysmal Quality Control issue on newer models? Why hasn't GM opened up Tech Service Bulletins on these issues to let the common man figure out what to do?

    If one searches the internet they will immediately see tons of Fuel Pump failures on GM products. I've already replaced Fuel Pump, Fuel Pressure Regulator and CrankShaft Position sensor and had to finally break down and take it into dealer to get it repaired. This indicates to me that the system is too complex with not enough OBD for the average owner to diagnose and fix.

    The expense and time involved in resolving this has made me have to admit I bought my very first lemon and it was a 99 GMC Sierra. It is so frustrating, I am considering moving over to Ford for a reliable Fuel System alone.
    Last edited by Mr. Sierra; 05-25-2011 at 11:37 AM.

  2. #2

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    Are you the original owner and how many miles on the truck??

  3. #3

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    Not original owner 125K on truck.

  4. #4

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    Well maybe the orignal owner never changed the fuel filter and/or ran crap gas. My '96 Burb's fuel pump went out at around 100,000 miles, but nothing last forever. It now has over 240,000 miles on it. My current trucks, '05 Silverado and Trailblazer have never had any fuel issues. I think alot has to do with the maintance and running good quality fuel ( not Walmart or other discount gas).

  5. #5
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    Sierra, I agree it would be nice if we had access to all GM Tech bulletins, but don't expect this from Ford or Dodge, nobody shares all information. As for your particular '99 it's like STB says, previous maintanence by the former owner(s) is key, & you're not privy to that info so you just don't know what was done or not done & some of your problems may not be attributable to GM themselves, but to the former owner(s). Your vehicle is 12 years old now & you have to expect some issues like this. It would be the same whether it was a Ford or Dodge.

    Before you "move over to Ford", Google Ford "Pinto"
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  6. #6

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    Quote Originally Posted by stephan View Post
    Sierra, I agree it would be nice if we had access to all GM Tech bulletins, but don't expect this from Ford or Dodge, nobody shares all information. As for your particular '99 it's like STB says, previous maintanence by the former owner(s) is key, & you're not privy to that info so you just don't know what was done or not done & some of your problems may not be attributable to GM themselves, but to the former owner(s). Your vehicle is 12 years old now & you have to expect some issues like this. It would be the same whether it was a Ford or Dodge.

    Before you "move over to Ford", Google Ford "Pinto"

    I don't think anybody would say that Fuel Pump problems on GM Trucks has been in the acceptable range of mean time between failures. Never the less, I changed the Fuel Pump, Fuel Pressure Reg., Filters, Crank Position Sensor, and for me anyway it still has issues. I know, it's a 99 and old. That's why I replaced the parts.

    On the other hand how many fuel pumps on prior vehicles have you replaced? I ran a Chevy Cavalier of all things well in 130K range and only replaced spark plugs. Prior to this truck I have never in my life of driving (since 1972) had to change a fuel pump or diagnose difficult fuel system issues. Shoot I remember one car I bought in 73 for $50.00, because it wouldn't start. We pulled the tank off and all the years of desert driving in New Mexico has allowed about 1/16" of dirt and sand in bottom of tank. That fuel pump continued to work fine after we cleaned tank.

    Everybody I've talked to knows about replacing Fuel Pumps on GM trucks, even strangers in Gas Stations that have a service bay... In fact I called a tow truck just last week, the guy jumped out of the truck and banged on the bottom of gas tank with 2lb hammer. Now why did he do that? Because he knows the dirty little GM Secret on Fuel Pumps that come with new wiring harnesses. What he didn't know was that it was a new pump I had replaced last year.

    As for the TSBs, I think GM should make them public if there are known major issues and they engineered a change such as in the wiring harness for the fuel pumps. That tells you they know something. Google only shows 4.2 million hits for this search.

    Moving to Ford would kill me, but they are the only U.S. auto company that didn't need bail out money. Why? Their quality is top notch right now and they have good management. They are not the same company that built Pintos.
    Last edited by Mr. Sierra; 05-25-2011 at 11:30 PM.

  7. #7

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    Mr. Sierra, You are spot on when it come to fuel pumps. I have had 2 Yukons (2001) (2002) and both of them required new fuel pumps. One of them required 2. All of the pumps were replaced before 100,000 miles. I asked my brother who is a mechanic and he said gm's are known for this issue. He also said it has NOTHING to do with the gas you buy. This is a classic GM issue that will not be resolved even if GM is aware of this! They will not do any recalls because $ will be involved. It puts the consumer once again in a tough spot and I am sorry we have to be put in this situation.

  8. #8

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    Quote Originally Posted by brose View Post
    Mr. Sierra, You are spot on when it come to fuel pumps. I have had 2 Yukons (2001) (2002) and both of them required new fuel pumps. One of them required 2. All of the pumps were replaced before 100,000 miles. I asked my brother who is a mechanic and he said gm's are known for this issue. He also said it has NOTHING to do with the gas you buy. This is a classic GM issue that will not be resolved even if GM is aware of this! They will not do any recalls because $ will be involved. It puts the consumer once again in a tough spot and I am sorry we have to be put in this situation.
    Holy thread revival Batman!!!!

    Adding to this topic, I've recently replaced my fuel pump. There was a change in the electrical connectors which I hope have alliviated any major issues down the line.
    2000 Silverado 5.3L Z71 4x4: K&N air filter, Procomp 16x8 rims, 285/70R16 Toyo AT2s, Kenwood head unit, Alpine 500.1 amp, 12" kicker, Infinity 5.25" speakers, Bilstein HD shocks, EBC GD Sport dimple & slotted front rotors w. EBC green stuff pads, Brembo slotted rear rotors & HIDs.

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