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Dark green provides power to fuel pump relay from the ECU. Orange wire at fuel pump relay is power at all time and is provide from the ECM/Bat Fuse at fuse block (Left side of dash). It also connects to the fuel pump oil pressure switch. The grey wire at relay provides power to the fuel pump and fuel pum oil pressure switch. The red plug thats tape to harness from relay/fuse center is the prime connector..
Take your vin number to any Chevy Dealer's Parts Counter. They can pull up the parts diagram and give you a part number. The ring is most likely a dealer part. So you will need to go to the dealer anyway to buy this part.
to remove the fuel pump you mus lower the fuel tank there ae two bolts on the back of the tank spray with wd 40 and use deep well socket 9/16 or 5/8 socket first lossen fuel hose clamp and over fill tube then unscrew the two bolts holding tank to vechicle, use a floor jack and a piece of plywood to lower the tank downone you have the tank on the ground tap the lock ring counter clockwise the tubes and wires come out of the center of the lock ring, tap it with a old wood chisel on two oppiste sides to get it to move once the ring is lose lift the fuel pump amd fuel sending unit out of the tank, replace fuel sock and o-ring on tank lube the o ring before installation and install in reverse proceedure replace main fuel filter, pull tank out and make sure there is no **** in the tank clen if there is. check the pickup tube for cracks. and put it back together and your set to go.
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
Hello, yes the check valve is in the fuel pump assembly. The check valve is leaking and the pump will burn out soon. Unfortunately the aftermarket fuel pumps can be very unreliable. A good portion of problems we see on this site are from people who replace the pump sometimes twice and it still doesn't work.