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I've been fighting with Fuel Pump issues for the last month or so, so I need a bit of help. The car is a 1998 9000 CSE Turbo with 436K+ miles on it (yes, kind of amazing). It had been running perfectly until about a month ago when I came off the train and it refused to start. I had just picked up a spare DIC so I swapped it and no change. I ran through the no-start checklist and determined it was the fuel pump.
So, on Monday, I swapped in a brand new Aeromotive 340lph pump and with a jump from my son's 9-3SS, it started right up, ran a little rough for a few minutes and then smoothed out as I went to get more fuel. At the gas station, it started right back up, I filled up the tires as they had lost quite a bit of air while sitting, and then drove it back home and parked it for about 6 hours.
When I came back out to start it again, it started right up, and then after about 10 minutes coughed a little and died. I tried to restart it again multiple times to the point where I ran down the battery and had to again get starting assistance from the 9-3. It didn't want to start with the jump for about 10 minutes, but then it sprang back to life and ran fine. I drove it around the block without any issues (reminding myself why I love this car so much) and came back and parked in my driveway. I turned off the ignition and tried to restart it again with nothing.
I figured that maybe the fuel pump was getting warm or perhaps there was some kind of vapor lock, so I let it sit overnight and tried to start it the next morning to no avail. This morning, I again jumped it using my wife's 9-5 wagon and no luck starting it again. I'm not hearing the fuel pump run, but to be honest, when it was running, I could never hear the fuel pump run on start or tick over.
I checked voltage at the fuses (14 and 22 as reference) and seeing a good solid 14.1V until I crank it. Once I start cranking, the voltage at the fuel pump fuse drops to 1-2V (I'm using a cheaper voltmeter that I keep in the car, so I expect a ~1V margin). It does not return to 14V until I turn the key off.
I have NOT yet checked voltage at the fuel pump itself, and plan to do so tonight if I'm not washed away in the t-storms we're supposed to be getting in the NE tonight.
Is there any chance that the fuel pump is pulling either too much current across the relay and frying it? I love this car, and I'd like to be able to use it again as my daily. Any suggestions would be very much appreciated!
Jason
, Thu, 6 Sep 2018 08:25:47
, Thu, 6 Sep 2018 06:49:45, Fri, 7 Sep 2018 08:49:03
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