Alright, I'm at wit's end with this fuel issue I'm having and I need your help. The person who provides me with the solution will get $20.
The Car: 06/86 325es with 2.7i m20b27
The Problem:
Fuel pressure drops from 40psi to ~15psi under sustained throttle.
During this starvation, if I let off to ~1/4 throttle the pressure begins to sustain itself and the car will slowly continue to accelerate. Anymore than 1/4 throttle and the pressure plummets.
If I turn the car off for ~10-12 seconds, the pressure stabilizes and I can accelerate to redline in all 5 gears without issue (at full throttle).
The external fuel pump has an extremely loud whine and the noise pulsates/fluctuates once the starvation has begun to happen. It's so loud that I can even hear it when the music is playing and all windows are closed. See Video below for reference.
The History:
I bought the car with a ton of engine issues. So I rebuilt the engine into a 2.7i as I had plenty of engines at my disposal. All new electronics, rebuilt afm, mostly new everything.
This fuel issue was a problem prior to the engine swap and is the last remaining issue from the original list. (It was a very long one).
What I've done so far:
1. Replaced External pump with brand new pump (The video is the new pump)
2. Swapped internal pump with multiple (3) working pumps
3. Replaced FPR with 2 known working fprs.
4. Brand new fuel filter
5. Replaced all soft fuel lines
6. Removed rusted dampener unit. (Pulse absorber was not on car when I bought it.
7. Tested BOTH pumps for voltage - both remained consistent throughout the test with no significant fluctuation to cause any concern.
What's next:
My next step is to clean the hard lines.
The Challenge:
I don't know if any of you have ever run in to this issue before, I'm sure someone has had to. Please provide me with a solution for me to try out - if it works, I'll paypal you $20.
Reference for Fuel Pump noise and flucations (car is at idle).
The Car: 06/86 325es with 2.7i m20b27
The Problem:
Fuel pressure drops from 40psi to ~15psi under sustained throttle.
During this starvation, if I let off to ~1/4 throttle the pressure begins to sustain itself and the car will slowly continue to accelerate. Anymore than 1/4 throttle and the pressure plummets.
If I turn the car off for ~10-12 seconds, the pressure stabilizes and I can accelerate to redline in all 5 gears without issue (at full throttle).
The external fuel pump has an extremely loud whine and the noise pulsates/fluctuates once the starvation has begun to happen. It's so loud that I can even hear it when the music is playing and all windows are closed. See Video below for reference.
The History:
I bought the car with a ton of engine issues. So I rebuilt the engine into a 2.7i as I had plenty of engines at my disposal. All new electronics, rebuilt afm, mostly new everything.
This fuel issue was a problem prior to the engine swap and is the last remaining issue from the original list. (It was a very long one).
What I've done so far:
1. Replaced External pump with brand new pump (The video is the new pump)
2. Swapped internal pump with multiple (3) working pumps
3. Replaced FPR with 2 known working fprs.
4. Brand new fuel filter
5. Replaced all soft fuel lines
6. Removed rusted dampener unit. (Pulse absorber was not on car when I bought it.
7. Tested BOTH pumps for voltage - both remained consistent throughout the test with no significant fluctuation to cause any concern.
What's next:
My next step is to clean the hard lines.
The Challenge:
I don't know if any of you have ever run in to this issue before, I'm sure someone has had to. Please provide me with a solution for me to try out - if it works, I'll paypal you $20.
Reference for Fuel Pump noise and flucations (car is at idle).
that just says "Listen to Jim damnit!".
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