4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Fuel Pressure Regulator Problems

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Old 02-27-2006, 08:28 PM
  #11  
Jglisson
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Default RE: Fuel Pressure Regulator Problems

This is pretty easy...your fuel pump is probably running backwards. Take a look at the fuel pump harness and see if you may have reversed the wires. Turn your ignition on and wait until you hear the pump shut off. Then use a small screw driver to press down the schrader valve which is mounted on the fuel rail (looks like a little metal valve stem). You should have a good spray of fuel (watch your eyes). If you have a guage, ignition on pressure should be close to 50 psi with running pressure at idle around 40-45psi.
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Old 02-27-2006, 09:01 PM
  #12  
blownstanger
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Default RE: Fuel Pressure Regulator Problems

If I'm not getting enuff fuel pressure then what might the problem be? Cuz Im not sure, but i dont thing I pugged it backwards. I did it exactly like my stock one was. Then I plugged my sock pump back in thinking the new pump was the problem...and still the same thing. Wha else could the problem be.
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Old 02-28-2006, 12:44 AM
  #13  
beheivjer
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Default RE: Fuel Pressure Regulator Problems

pass side back by the fire wall is a the regulator it is on the fuel rail if you unhook the vacuum line from it it will let the fuel pressure rise up. ill try to take a pic of mine tomarrow if you still need
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Old 02-28-2006, 01:28 PM
  #14  
blownstanger
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Default RE: Fuel Pressure Regulator Problems

Appreciate it thanks.
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