Fuel pressure - what should it be?
06-30-2009, 05:58 PM
#1
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Join Date: Jun 2009
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.
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.
07-13-2009, 11:53 PM
#2
4th Gear Member
Join Date: Mar 2009
Location: CA
Posts: 1,291
I'm looking into the same thing- what the correct fuel pressure is for the eec 4 5.0L.
Is the aftermarket rising rate fuel regulator necessary? I thought that if it's regulated to the specified pressure- the injectors would operate correctly. I mean, it's the EEC that is adjusting the injectors movement electronically, not by changing the pressure (mechanically).
Apparently, the factory FPR is adjusted by engine vacuum also.
Is the aftermarket rising rate fuel regulator necessary? I thought that if it's regulated to the specified pressure- the injectors would operate correctly. I mean, it's the EEC that is adjusting the injectors movement electronically, not by changing the pressure (mechanically).
Apparently, the factory FPR is adjusted by engine vacuum also.
Last edited by socalwrench; 07-14-2009 at 12:09 AM.
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