Hello, Got a question concerning the factory fuel pressure for 550cc injectors. What might it be at? I dont know why i thought it was like 35lb with the vacumm line off the regulator but its areal possibility that im wrong

Any Help Out There PLEASE Respond......

Later All
Ron

 

it should be around 35 while under boost.

 

Factory Specs: 28.4 with vacuum on regulator, 34.1-39.8 with no vacuum on the fuel pressure regulator.

Irv, Keith's dad

 

For what its worth......I drove the turboii with a new fuel pressure gauge strapped to the windshield wipers. If memory serves, the gauge read about 35psi while maintaining a steady 70mph, and when under boost it would climb to 42psi. Thats when I finaly saw the light. The fuel pressure regulator is progressive. The more boost, the higher the pressure out of the regulator. Sitting in the driveway, I put a Mittyvac on the vac hose that is on the regulator. With the boost gauge teed in , if I put 10psi on the regulator, the fuel gauge would go to 50psi. At that time I was not boosting to 10psi with the car, only a hair off 8. Just out of curiosity I put the 87N/A to the same test and sure enough, even though the n/a does not *boost*, if you put 10psi on the regulators vac hose, you got 50psi on the fuel gauge.
Prior to this little adventure I would have answered as Keith(Irv) did.