Fuel Pressures

[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

[Guest 40th-edition]

No one Has any idea about fuel pressures on a skyline?

[Abo Bob]

How many psi is that? Should be 36-38psi at idle.

[Guest 40th-edition]

not sure about psi, but im worryed about the max pressure.

has no worrys with idling and running

[Craved]

350 kpa is 50psi

seems alot high to me

[WogsRus]

my stock pump did not go above 45 psi, it was dead. Form memory it is suppose to be 2.5 bar = 37.5 psi at idle. IE: no vacume just atmospheric.

Get a new pump just incase yours is dead.

[Sydneykid]

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.

cheers

Edited September 14, 2006 by Sydneykid

[Guest 40th-edition]

Thatnks 4 that "sydneykid" thats a great help, cheers