Question about 1999 Chevrolet Silverado 1500
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.
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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Posted on Jan 02, 2017
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
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
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 conditions.....run 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
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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