Question about 1999 Chevrolet Silverado 1500

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How do i fix it?

Changed fuel pump, relay, plugs, and wires, got voltage at tank, checked out wiring harness, and sensors leaves me with fuel pump/oil sending switch to find and the button to reset comp.

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  • 50 Answers

I don't know what you're asking about because I can't see your problem. I got an early '99 in once that no one could fix; it started and shut right off. They have a "pass-lock" on the steering column as a theft guard. I had to bring it to a GM dealer to have the cpu "reprogrammed on line by GM. Cost me about $35.00. But like I said, I don't know what your's is doing.

Posted on May 26, 2014

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Try to find the roll over safety switch may be in the kick panel on the pasanger side at floor. Some thing may have triggered it to shut the fuel off. There is a reset button on it.

Posted on May 08, 2014

  • Jeremy W.
    Jeremy W. May 09, 2014

    Ford is the only one that uses this type of switch. There will not be one on any Chevrolet or GM product,



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Posted on Jan 02, 2017

66 chrgr
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SOURCE: no voltage going to new fuel pump

The GRAY wire i believe going to the fuel pump is the hot wire it should come on for 2 seconds with just the key in the on position this is were you should check voltage for 2 seconds then it will go away until you crank the truck.Your oil sending unit is behind your distributor that could be the cause .

Posted on Aug 01, 2009

  • 6674 Answers

SOURCE: 2001 chevy s 10

Find power wire coming from relay to pump when key switched on, & follow it back to pump. If you have power out of relay & nothing at pump, then I'd look for a break in wire to rear, or just run a new one. Double check your ground as well.

Posted on Jul 05, 2009

  • 84 Answers

SOURCE: electric fuel pump wiring harness diagram

Your best bet is to type it in to and got to the repair section. it will tell you there.

Posted on Apr 23, 2009

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SOURCE: have no voltage to fuel pump. have checked fuse,

You are checking on the gray wire at the pump.
This wire will ONLY have power for 2 to 3 seconds after key is turned to run position after key has been OFF for 10 seconds.
.....or when there is oil pressure.
If you do not have power under these a new FUSED power wire to the pump/pump wiring that has only power when the key is on.
The other way to fix this is usually a rewire of the relay center/fuse box to supply power to the fuel pump relay when the key is on.

Posted on Aug 23, 2009

  • 1 Answer

SOURCE: low voltage to fuel pump

make sure you are checking the lead for the pump and not the the tank sending unit usually 5v. without engine running there is only 12v for 2 seconds when ignition turnes on then when engine starts it switches to constant 12v. if your engine is not running you will not get a constant 12v.

Posted on Aug 29, 2009

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