No power to fuel pump - BMW Forum

SITAC · 03-20-2006, 10:09 PM

New member here, posting for first time. I have a 92 325i auto, which would not start. My car was not getting any fuel, so i replaced with a brand new f/pump but car will only crank. Removed fuel line that goes to fuel rail and placed inside clear bottle to see if fuel is getting to fuel rail. Tried starting but no fuel will come out. I tried jumping the f/pump relay according to bentley manual and fuel did come out of fuel line. Ran power from battery directly to f/pump and f/pump worked, sending fuel into bottle. I also tried switching relays but no power to f/pump when key is turned on, or when trying to start. Checked voltage to f/pump and main system relay sockets and voltage was ok. Opened up area where dme is located and inside was dry. Car worked fine week before, tried to start a week later and this is the problem that I'm faced with. Really hope it's not the dme. Sorry for long post, but need answers/suggestions on this prob, thanks.

SITAC · 03-21-2006, 10:15 AM

need help...anybody !

Hamfisted · 03-21-2006, 02:03 PM

You're sure fuse #18 is good? Did you try removing the fuel pump relay and jumping across the slot 30 & 87 where the relay plugs in? You can do that without turning the key on and the pump should run. If not there's a problem in the wiring between the relay and pump. In the Start position the pump relay bypasses the DME anyway. That's all I can think of right now.

Mike

SITAC · 03-21-2006, 02:34 PM

Quote:

Originally Posted by Hamfisted

You're sure fuse #18 is good? Did you try removing the fuel pump relay and jumping across the slot 30 & 87 where the relay plugs in? You can do that without turning the key on and the pump should run. If not there's a problem in the wiring between the relay and pump. In the Start position the pump relay bypasses the DME anyway. That's all I can think of right now.
Mike

I did swap out the #18 fuse with another one and still f/pump did not come on. I also did the relay jumping procedure as mentioned in my post. Thanks for the reply.

325isBaby · 03-21-2006, 05:19 PM

check the fuel pump relay also

kiepsaurieng · 04-05-2006, 11:52 AM

SITAC, did you ever find out what the problem was ? my '95 325Ci is having the same problem,

SITAC · 04-06-2006, 04:36 PM

Still dealing with this problem. However was able to get the car to start. I think there is a problem with the wiring from the dme to the f/pump realy. Drove car on highway up to 110mph and let sit for 3 hours. Tried to restart, but car will not start. Tried restarting the next morning and car started ok. Sometimes when I turn the key, I can hear the f/pump coming on. I have heard f/pump activate, but when i try to start, nothing. I did notice that by turning ignition key to start and slightly pressing on the gas pedal at the same time I will get the car to start. Will try checking for ground in brown wire under dme main relay socket when the car will not start.