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the symptoms start once you have been driving for a while, when you give it any good amount of throttle the fuel pressure drops to 0. Here is what ive done:
Man this santa fe sucks.
Fuel pressure drop still.
Fuel lines good, pressure checked and flushed.
Pump and filter good, replaced all the orings and inspected assembly about 10 times now, replaced all the o rings. Tried a pump from pick n pull already assembled, same problem, got brand new pump and filter, same problem.
Regulator good (pinched return with no difference) replaced regulator 3 times assuming i pulled broken ones from the wrecking yard.
Injectors good, original injectors failed leakdown test, swapping them did nothing but fix the leakdown problem.
Ecu good (supplied power directly to pump)
Perge solenoid good, replaced and tested
Fuel trims perfect till pressure drop.
I replaced every single part multiple times at this point. The only thing that made a slight difference was a brand new pump. But that’s only because the pump is stronger.
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Time to stop firing the parts cannon and work the problem.
the symptoms start once you have been driving for a while, when you give it any good amount of throttle the fuel pressure drops to 0.
Where exactly is the fuel pressure going????
First question to be asked.
Is the fuel pump functioning when the fuel pressure drops?
Being that you have replaced the fuel pump a few times, doesn’t mean that specifically was the cause.
If for some reason your losing the control signal or power / ground at a certain speed / rpm could be your issue.
Might suggest putting a amp clamp, DVOM(s) on the supply side of the fuel pump at the fuel pump along with monitoring the control signal and see if supply power and control remain when pressure drops off.
My thought is that you’ll see either one of them fall off.
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