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Guest 40th-edition

Today when chassing up somethings on my car (sometimes hard to start) i hooked up a fuel pressure guage and measured the fuel pressure at

350 kpa

and then kinked off the return line to send pump to max output and only got 450kpa

is this normal for a standard R33 ser2 fuel pump

sames quite low compaired to the fords and holdens we test at work!

has any one got figgers or done the test??

cheers

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Today when chassing up somethings on my car (sometimes hard to start) i hooked up a fuel pressure guage and measured the fuel pressure at

350 kpa

and then kinked off the return line to send pump to max output and only got 450kpa

is this normal for a standard R33 ser2 fuel pump

sames quite low compaired to the fords and holdens we test at work!

has any one got figgers or done the test??

cheers

Standard pressure is 36-38 psi (plus or minus boost) that’s ~250 kpa

350 kpa is 51 psi, which would indicate 100kpa (13-15 psi) vacuum at idle, which is unlikely.

450 kpa is 65 psi which is the maximum pressure rating of an R33GTST standard fuel pump at 11-12 volts.

So I wouldn't be looking to the fuel pump as your problem, based on the idling pressure (51 psi) I would be more suspicious of the fuel pressure regulator or a blockage in the return line to the tank.

:O cheers :)

Edited by Sydneykid
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https://www.sau.com.au/forums/topic/134025-fuel-pressures/#findComment-2492528
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