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Re: where is the fuel pump located on an 88 bmw 750il
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.
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Hi, I don't know if you have tried this but I would open up the line before it got to the fuel "buss" (a type of manifold that delivers fuel to the injectors) on top of the motor and just turn the key on and off repeatedly. I would put a cup under the open line. The pumps should run for a few seconds each time you turn the key on. You may not even have to crank the the engine. You may be able to hear the pump. The fuel (with no resistance) should flow out of the tube or pipe, etc. If you get a result, then go ahead and connect the fuel buss up again. There is a check valve in the buss that maintains the internal pressure to a high enough level for fuel to travel through the injectors into the manifold.. I hope this helps, Best, Mark
you beemer has two fuel pumps but if its starting they should be fine. I would check for vacuum leaks.That being a hose some where is ether broken off or not on.Changing your fuel fitler id not a bad idea if you haven't done it.It is located in the engine compartment on the drivers side
Update--after getting car back from 3rd shop, it ran flawlessly for about a week or ten days. Then started doing it again. I decided to do some more troubleshooting myself. While trying to track down the components of the fuel pump electrical circuit, I did quite a bit of wire wiggling at the firewall and inside behind the glove box (the location of the fuel pump relay on this car). I had a buddy turn key to "on" while listening for the fuel pump relay to click. When he did, the fuel pump ran 2-3 seconds just like its supposed to. The car started right up, and has ran since---two weeks now. My problem definitely now looks like a short in the wiring somewhere in the fuel pump circuitry. Next time it does it, I'll try to further narrow down the area of the problem. I found this one basically by accident.
The fuel pump is located under the back seat on the passenger side. You will find an access cover and will need to remove the screws. You should be able to listen for the pump while someone cranks the car. Also I believe there is a large green w/ blue trace wire and an equally large brown wire at the connector. Check for battery voltage across the two wires. The fuse for the pump should be in the fuse panel under the hood.
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.