i got a 98 gt and i was wondering what stock fuel pressure is cuz i think mines low i just tested it and it said 30 psi at idle and if u stab the throttle it jumps to like 39 then falls back down to 30. Then when i shut the car off it stayed at 20 idk if this is right or what.
It might help if you understood what the vacuum line does. It provides a reference point for the fuel pressure.
The external guage measures atomspheric. So by disconnecting the vacuum line, the regulator is also operating atomspheric.
The fuel pressure is susposed to 40 PSI above the intake manifold pressure. At an idle, the intake is under vaccuum. To correctly compensate, the fuel pressure is "referenced" to the lower vacuum pressure (40-10=30).
Under a boosted application, the intake manifold is under pressure. Let's say the boost is 10 PSI. Then the fuel pressure should be 50 PSI (40+10=50).
What many ppl do for a quick test is to disconnect the vaccuum line. The fuel pressure is now atomspheric referenced and should be 40 PSI (for a Mustang).
Do not drive the car with the vacuum reference line disconnected. It will mess up the AF ratio. Under boosted applications, motor damage is likely.
so with the vacum line on its 30 and with it off its 40 correct? and who knows why my nitrous might have back fired through my intake
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?