L67 fuel pressure. The service manual says the spec fuel pressure range for a 1995 3800 S...
L67 fuel pressure. The service manual says the spec fuel pressure range for a 1995 3800 Series 1 supercharged engine should be 41-47 psi (off boost). Checking and testing your Fuel Pressure on a L67 What is the fuel pressure of a L67 engine. Would like what GM says in the manual. I also connected the -ve terminal of the battery to the car for ESD safety. Mar 2, 2009 · LT1-LT4 Modifications - L67 injectors in LT1 - I remember a thread awhile discussing how many lbs an l67 injector flows at lt1 fuel pressure. I then thought to bypass the L67 fuel pump management module (FPMM ?) so I disconnected the car's battery unplugged the FPMM and used another battery to power the fuel pump directly (FP+ and FP-) on the FPMM connector. The fuel pressure on these engines should be 56 to 62 psi with the key on and engine off. With boost, the pressure will be higher. Is the 98+ fuel pressure regulator vacuum referenced? Edit:Reading owns me, I take it your car is a 98+? Last edited by ak95ta; 06-03-2009 at 01:59 AM. Look up P0171 fault, should be showing in there where to go to find it Jun 2, 2009 · So the fuel pressure changes with MAP, keeping the flow rate the same, hence the straight line in the IFR table. huodivdxuiisjjeurfwcjujxytcakppjrxuobidgsv