I have changed the insturment cluster, and now got a new fuel pump but wire harness is a four wire and orginal is only 3 wire both black are a ground, Can they both go to frame. One grounds the sender and the other the pump. the gray is power to the pump and the purple is power to the sender signal?
It was an upgrade you need to cut wiring harness and replace it with the new connection system .or it could be a problem with the fuel pressure sensor that plugs into the top of the pump wiggle the wires
SOURCE: 99 silverado fuel pump
GRAY IS FUEL PUMP, PURPLE IS FUEL GAUGE, BLACK IS GROUND,ORANGE WITH BLACK GOES TO COMPUTER.GREY WIRE WITH KEY ON WILL BE BATTERY VOLTS FOR TWO SECONDS UNLESS CRANKING ENGINE OVER.PURPLE WILL REMAIN ON WITH KEY LESS VOLTS THOUGH
SOURCE: 1998 Suburban Fuel Pump wiring harness
if its the correct harness then yes... i would follow colors.conecting the thinner black to the orange/black.
i have built and repaired wire harness' for four winds rv for 5 yrs now and previously gm cars for 4 yrs
SOURCE: i recently asked about a fuel gauge that is
Absolutely, your gauge works off of resistance that is calibrated, if you have a rusty or bad ground you are causing more resistance, hence a full reading. Disconnecting it puts it to its default setting which is full, All the resistance in the unclean ground is tricking your sender in to thinking tank is full...
SOURCE: i recently asked about a fuel gauge that is
Most likely its the ground wire clean it up or replace it, and i bet the guage will read corectly.
SOURCE: where is the ground or grounds on the harness that
I doubt you have a fuel issue if you replaced the pump. Try this to bypass the fuel pump. Spray some quick start or brakle cleaner into the throttle body. If the car still does not start then the problem is ignition related, NOT fuel related. If it does start then go to mitcell1diy online , search. You can get all the diagnoses info there.
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