Stock fuel pressure ?
Thread Starter
Racer
Joined: Sep 2002
Posts: 424
Likes: 0
From: Va, Beach VA
Stock fuel pressure ?
What is stock fuel pressre?At the dyno(friend's c5) with 14.6 afr heading towards wot. He gets homeand pressure is at 65psi(high to me) and drops to 59psi iirc with vacuum line off. 14.6 obviously being way too lean for wot I also check nb o2 wich is at approx. .93x. Assuming there is an inaccuracy in their wide band o2 as reported, is 65psi normal. BTW stock progamming....
Former Vendor
Joined: May 2000
Posts: 2,406
Likes: 0
From: Roseville CA
Hey Rays, this is from the GM manual
The fuel pressure regulator is a diaphragm-operated relief valve. A software bias compensates the injector on-time because the fuel pressure regulator is not referenced to the manifold vacuum. The injector pulse width varies with the signal from the MAP sensor. With the ignition ON and the engine OFF, system fuel pressure at the pressure test connection should be 380-420 kPa (55-61 psi). If the pressure is too low, poor performance could result. If the pressure is too high, excessive odor and a DTC P0132, P0152, P0172, or P0175 may result. Refer to Fuel System Diagnosis for information on diagnosing fuel pressure conditions
Hope this helps.
The fuel pressure regulator is a diaphragm-operated relief valve. A software bias compensates the injector on-time because the fuel pressure regulator is not referenced to the manifold vacuum. The injector pulse width varies with the signal from the MAP sensor. With the ignition ON and the engine OFF, system fuel pressure at the pressure test connection should be 380-420 kPa (55-61 psi). If the pressure is too low, poor performance could result. If the pressure is too high, excessive odor and a DTC P0132, P0152, P0172, or P0175 may result. Refer to Fuel System Diagnosis for information on diagnosing fuel pressure conditions
Hope this helps.
