MustangForums.com - View Single Post - Fuel pressure

427cobra · 06-30-2009, 06:58 PM

I have an aftermarket EFI system that uses a Ford EEC4 control unit from a 1989-1993 mustang gt. It has a Mallory adjustable fuel pressure regulator and is a return type fuel system. The regulator has vacuum connection that raises or lowers fuel pressure 1:1 with manifold vacuum/pressure. Engine has 36 lb/hr injectors in it.

With the vacuum line disconnected, what should the fuel pressure be set at? The fuel pump only runs for a few seconds when the key is turned on, so I pull the vacuum line to check the pressure. I believe this is a correct way to set the pressure.

06-30-2009, 06:58 PM	#1
427cobra Join Date: Jun 2009 Vehicle: Shelby AC Cobra Replica Location: ohio Posts: 3	Fuel pressure - what should it be? I have an aftermarket EFI system that uses a Ford EEC4 control unit from a 1989-1993 mustang gt. It has a Mallory adjustable fuel pressure regulator and is a return type fuel system. The regulator has vacuum connection that raises or lowers fuel pressure 1:1 with manifold vacuum/pressure. Engine has 36 lb/hr injectors in it. With the vacuum line disconnected, what should the fuel pressure be set at? The fuel pump only runs for a few seconds when the key is turned on, so I pull the vacuum line to check the pressure. I believe this is a correct way to set the pressure.