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You have tried 3 different fuel pumps and still have low fuel pressure under load. I don't think it is the pump.
I assume you are using the factory wires, so they should be ok.
It is not your tune. The stock fuel system can provide enough fuel flow for the typical intake/exhaust bolt-ons.
(based on my calculations, the stock fuel system can support up to ~330 wheel HP)
If this was my car I would measure the voltage and current at the fuel pump while under load.
This does require special tools, but I think the next step is to verify the electrical side.
I do have a DMM. Do you think I could use the teeth test probes to measure while driving?
If so, anyone know the pinout of the harness?
I will never understand the logic of not having a serviceable fuel filter. Eventually all filters get dirty and clogged.
Slightly off topic, but...
It fits in the topic as well. Because every this filter sees new gas that unfortunately cannot do much for this gunk.
This same gunk will lower the pressure overall. It might be fine on light or part throttle since it is able to keep rails full just not at WOT.
It's worth checking it out.
The dilema here is that for those that know and need a way to fix this is. New housing or adding your own filter down the line.
As some here will dwell with E85 this will mean shorter intervals in the fuel department
I'm not saying this is your problem but if voltage checked out and you're meeting pressures at half of the time you have a restriction or possible leak between pump and housing
06-28-2020, 12:01 AM
