Car struggles to make fuel pressure

phunk

If your basket holds pressure, than it can only be a couple things causing pressure to drop:

1: filter clogged
2: fuel pump output too low (out of steam, defective) or wiring for it is not keeping up.
3: regulator bad
4: out-running the feed plumbing on the car, pressure dropping at high demand

I always ran a static pressure of 52-53psi in my car, no vacuum/boost reference.

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Mitco39

1. Filter could be clogged, but this would not explain why drop only occurs after repeated pulls.

2. Wiring does make sense, maybe repeated pulls heatsoak the wiring and as such the current and heat spiral out of of control (more heat, causes more current, which in turn causes more heat).

3. Doesn't explain why at the start of the pulls its perfect, 0 issues. Unless it is sensitive to engine bay heat, but I called automotive and they said they chances of it being the regulator are slim to none.

4. Also doesnt explain why its perfect when the pulls are starting. Ill get 2-5 pulls then she will start to really suffer.


My wife was looking through some R35 forums and one guy had a weak battery cause these issues, well mine is still the stock battery, so I think I will change that out as well as put more effort into tracing and diagnosing the wiring. Maybe I should go back to a static pressure in efforts of relieving the stress on the fuel pump wiring.

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