Question about Chevrolet C1500

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My 1998 Chevy C1500 5.7L V8 Only starts when i pour gas in the carburetor. The fuel pump is located in the tank i hear it kick on when i turn the key. When i do get it started if i accelerate hard my truck back fires. What is wrong? Please helo

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  • Expert
  • 77 Answers

The pump can be weak or obstructed, could be fuel filter too.

Posted on Oct 15, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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Mike258
  • 1498 Answers

SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system

Hey there boatright33,

A few things things immediately come to mind.

There may be a problem with the engine controller. You could check the ODBII onboard diagnostics. Auto part stores will usually do this for you at no cost.

When you pulled the ones that were/went bad, how did the filters look? Could there be particulate matter still in the tank causing them to fail.

I always put this one off until last. Check the injectors. Are they gummed up?

Let me know what you find out
Mike


Posted on Aug 12, 2008

cadman000
  • 607 Answers

SOURCE: 1990 chevy silverado fuel pump

It does seem to be a fuel problem, If your engine is fuel injected the fuel pump is in the gas tank. As far as the ground it is grounded through its harness and mounting.. First thing I would do is put a fuel gauge on the fuel rail fitting and check fuel pressures. Pump wil run for a few seconds when the key is turn ON., and then stop ( assuming its working ) A lack of pressure willindicate an inop pump, or even possibly a clog in the fuel filter. Let me know.

Posted on Mar 30, 2009

  • 1509 Answers

SOURCE: truck will start only when gas is put in carburetor

If this truck was running OK and you just went to start it and then it won't start as long as the tank has gas the fuel pump has quit. Sometimes the pump will Wake up with someone cranking the engine and knocking on the fuel tank. But understanding you statement about it starts by adding fuel and it continues to run, the fuel pump is still bad but the pressure the pump is putting out is to low to start. These trucks need 50 psi just to run 45 and they'll start adding poured in fuel and they'll run but if you were to test real preformance after started the engine will be down on power. Tank draining and tank removeall is required to change the pump. The tank is easier to remove with the driveshaft removed. so removeing the lines from the top of the tank is easier as the tank is removed. The presure can be cheacked by putting a fuel pressure gauge onto the fuel rail connector just behind the throttle body near the distrubutor. ( Fingernailing ) the valve to see if theirs gas isn't good as the fuel spraying ( even if it's not high enought pressure) on the distrubutor can get you in a fire problem as I've seen if myself. The tank removal job is a pro job or at least one that should be done where you can put out a big fire easy and not burn other cars yourself and buildings. This is not a do if your selfer job, on a never did one before note. You've done em and are handy and have a good way to remove most of the gas and get it away from the job. good. This job is a common one on GM products. and is the number one cause of shop fires even in a pro shop. Be careful and good luck

Posted on Oct 10, 2009

rnb_tnt
  • 111 Answers

SOURCE: 1979 chevy step van 350 new fuel pump rebuilt carburetor wont sta

remove the fuel line from the carb, put it into a bottle, crank the engine, If the bottle has fuel in it the fuel pump is working properly, if not, check the filter, and the fuel lines to the tank!!!

Posted on Nov 02, 2009

  • 4 Answers

SOURCE: 94 chevy 5.7L wont turn on the fuel pump

undo the fuel line where it joins the fuel rail to your injectors.. it is under extreme pressure so be careful.. get someone to crank car for a second or two and if fuel sprays out then its not a fuel problem..

Posted on Feb 22, 2010

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