1. Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online
    Online since 2004, we are the #1 Chevy Truck & SUV forum and user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free
    Registering is Free and Easy! Hope to see you on the forums soon!

Couple of fuel issues

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by blueZ71, Feb 26, 2009.

  1. blueZ71

    blueZ71 Rockstar 100 Posts

    Low fuel warning light stays on almost all the time, sometimes it'll run up to a full tank though. I've heard it might be the float in the tank but I also know some who have had to have gauge clusters replaced.

    I'm gonna kill my starter motor. I normally have to turn it over for about 5 seconds, pump the gas pedal (which is that even doing anything as its fuel injected?) a few times, then turn over for another 5 seconds before it starts. Is the fuel pump bad?
  2. cascott325

    cascott325 Epic Member 5+ Years 1000 Posts

    sending unit has gone bad. mine had the same problem. save yourself the headache, and go ahead and get ac delco parts. the O rings inthe pump have failed causing the fuel pressure to bled off as soon as you cut off the vehicle. you will have a pressure reading of around 45psi where you should be getting over 55 psi while running. you should also go ahead and replace the fuelpressure regulator as well b/c it will go out too when the o rings go bad. sorry bout that dude, but i had warranty work done when i got my truck, and they put crap parts on and i ended up having 4 fuel pumps put on till i took it somewhere else and just had them put in delco parts
  3. cascott325

    cascott325 Epic Member 5+ Years 1000 Posts

    that was all with in 1 year of purchase!
  4. blueZ71

    blueZ71 Rockstar 100 Posts

    how imperative is this repair? what sort of damage am i causing by running it in this condition?
  5. cascott325

    cascott325 Epic Member 5+ Years 1000 Posts

    i dont know of any, but your performance will be down, your fuel usage will be up, and it will piss you off. you can do the fuel pressure regulator in about 5 min. but you will have to drop the tank to do the fuel pump. i was to the point that if it were to go out again, i was going to take it to a body shop to have a door cut into the bed so i didnt have to leave it at the shop for a day
  6. blueZ71

    blueZ71 Rockstar 100 Posts

    So I need to replace the fuel pump and the sending unit or just the sending unit? I'm thinking that if the fuel pump is the problem shouldn't I be able to turn the key on to the acc position to build fuel pressure?
  7. cascott325

    cascott325 Epic Member 5+ Years 1000 Posts

    the sending unit and the fuel pump is all one piece. so yes, both will need replacing. the sending unit is why your guage is going crazy, and the reason you are having to crank it so long is due to the pump not holding pressure. i had the exact problem in my truck.

Share This Page