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Re: 88 jeep trucks fuel pump has bad ground
Try splicing in a new ground and see if that get the fuel pump running. also you can test it by applying 12 volts to the fuel pump wires themselves. if the pump is ok it should spin right up. if the connections are good and the fuel pump still doesn't run, it may be the pump itself that is bad. verify that its a always grounded switched 12 v style pump before attempting to test. if the ground wire just bolts to the frame or the cab then its a normal grounded system. some of the pump are always live and switched by applying a ground.
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USSUALLY WHEN GAGE GOES WAY OVERFULL IT'S A BAD GROUND
QUICK CHECK USE BOOSTER CABLE ONE END ON TANK OTHER END ON BATTERY NEGATIVE IF GAGE GOES OK MAKE UP SHORT WIRE FROM FRAME TO TANK SEEM LIP
AND ATTACH MAKE SURE METAL IS CLEAN
have you checked all fuses under the hood? have you checked the fuel pump relay? you may be able to swap the fuel pump relay with amother relay in the fuse box.are you getting power into and out of the reset switch? from there it goes to the fuel pump. if power is getting to the fuel pump and it has a good ground, the the pump is bad.
well, first, to find out if its the in tank fuel pump or the tank selector valve, the cheapest and probable easiest thing to do is find the selector valve under the truck and switch the incoming fuel lines. front tank to rear tank inlet, and vice versa. If the truck still doesnt run, you either have an electrical delivery problem to the in tank fuel pump or a bad fuel pump. If after switching the lines, it does run, then you need a new selector valve
I've worked on quite a few beemers & they all had 2 pumps. The main is in the gas tank & the auxillary is under the car usually on the passenger side. I'm not 100% positive since all the ones I've worked on were the 3 & 6 series. Find the gas tank, should be under the trunk,I've seen them in different spots believe it or not. There should be an access panel in the trunk or under the back seat to the main fuel pump. Check it for power with the key on. Since it's not running, you may need a second person to cycle the key on & off. The relay will only power the pump for 5 sec or without starting. Do the same test for the secondary pump. I think you'll find the main one is toast. The other one hardly ever goes bad.
The fuel pump ground wire is loose. If you have a loose parking brake pedal or recently had it worked on, check the black and yellow wire that's on one of the screws that holds the Pk. brake assembly. It's hard to find, but it's up there. I guess it could be elsewhwere on the ground wire between the fuel pump and the grounding point by the Pk. brake.