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Okay, I just did fuel flow test with my Launch X431 scanner which has "Fuel Pump Relay Final Stage" test function, it can activate fuel pump with key in ON position, this is nice so I don't have to jump the fuel pump relay, here is the results:
- At the supply line before the fuel filter, 20 seconds got almost 1 liter of fuel out, that's way exceeded 30 seconds 850ml specs
- At the return line, got 900ml running fuel pump for 30 seconds, but the fuel came out was yellowish, looks like dirtier than the fuel dumped from the supply line, I guess I need to replace fuel filter then.
Also removed vacuum line from fuel regulator, no fuel dribbled out so guess the fuel regulator is good.
Also pulled the Y vacuum splitter out of the vacuum reservoir and used a hand vacuum pump to test the vacuum reservoir, it cannot hold vacuum, so this means the vacuum reservoir is bad and need to be replaced?
Since fuel pressure when engine is off is at 2.8 ~ 3 bar (spec is 3.8 bar), could the fuel pump is still the problem that the check-valve is bad even the flow is good?
Will order new fuel filter and new vacuum reservoir.
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