Fuel pressure regulator
10-07-2006, 08:58 AM
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Fuel pressure regulator I have a 1999 Pontiac LS1 installed in a 1984 Studebaker Avanti 2. It runs excellent under power, but at idle my inline MSD fuel pump starts to cavitate causing the engine to surge and stall. At present I am not running a fuel pressure regulator or a return line. Which inline regulator would be best for this problem? I believe that I need a constant source of fuel through the pump returning to the tank at idle to solve this.
10-07-2006, 10:42 AM
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Aeromotive makes an inline regulator that is adjustable. But before you install one you need to check a couple of things.
First, you need to measure the fuel pressure at the rail with a mechanical gauge. For the Gen III engine, the factory calls for a steady 55-60 psi under all conditions (key ON, idle, part and full throttle). What is the flow rate of the inline pump and do you have an intake pump as well? I would guess if you're running just the inline pump, it's not supplying enough fuel. I would also check to make sure the pump has enough voltage.
First, you need to measure the fuel pressure at the rail with a mechanical gauge. For the Gen III engine, the factory calls for a steady 55-60 psi under all conditions (key ON, idle, part and full throttle). What is the flow rate of the inline pump and do you have an intake pump as well? I would guess if you're running just the inline pump, it's not supplying enough fuel. I would also check to make sure the pump has enough voltage.