I picked up a non running 1987 325is last week and today was the first chance I had to try and figure out what's wrong. The PO said they were driving one day and it just shut off without warning. They cranked it a few times and it restarted once for about 30 seconds and then shut off and wouldn't restart.
I've had several cars that have done this exact same thing and it has always been the fuel pump.
Today before going to the fuel pump I swapped in a CPS and main relay and fuel pump relay from a running car and none of that helped.
I then jumped the fuel pump relay and the main pump under the car would run but not the one in the tank. This is an 03/87 car so it has two pumps. I then took a battery and set in on the floor in the back seat and ran one wire from each of the battery terminals and then touched the other end of each wire to the leads on the in tank fuel pump and nothing.
So, the question is that if you directly energize the in tank fuel pump as I've described would that make it run if it was in working order, seems logical that it would. And I know, it's not the smartest thing to do since a spark could have happened while doing this right on top of the tank, but there was no leakage on top and no gas vapors so it worked out ok. Just don't want to spend the money on a new one if that's not the problem. The in tank pump looks to be the original fuel pump.
Thanks
I've had several cars that have done this exact same thing and it has always been the fuel pump.
Today before going to the fuel pump I swapped in a CPS and main relay and fuel pump relay from a running car and none of that helped.
I then jumped the fuel pump relay and the main pump under the car would run but not the one in the tank. This is an 03/87 car so it has two pumps. I then took a battery and set in on the floor in the back seat and ran one wire from each of the battery terminals and then touched the other end of each wire to the leads on the in tank fuel pump and nothing.
So, the question is that if you directly energize the in tank fuel pump as I've described would that make it run if it was in working order, seems logical that it would. And I know, it's not the smartest thing to do since a spark could have happened while doing this right on top of the tank, but there was no leakage on top and no gas vapors so it worked out ok. Just don't want to spend the money on a new one if that's not the problem. The in tank pump looks to be the original fuel pump.
Thanks
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