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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 02-26-2014, 08:05 AM   #1
Charlieg3
 
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Default Fuel pressure regulator

1990 gt, t5, trick flow heads, 30 lbs injectors. The car has run great since I bought it 6 months ago. Recently is has had an enginemmiss under load, and it feels like it is shutting off when you go to wide open throttle. I installed a new 255 LPH fuel pump when I bought it. Fuel pressure reads 36 at idle, 40 when the vacuum hose is unhooked. In second gear at 2000 rpm pressure is 32 psi, at 4000 rpm pressure drops to 25, and it takes a while to build pressure back up over 30 psi. Any suggestions, fuel pressure regulator, pump, vacuum leak?
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Old 03-01-2014, 03:50 PM   #2
StalkerGT
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I had a similar problem and it was the regulator...I would put an adjustable in since you have heads and injectors..etc
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Old 03-02-2014, 06:41 PM   #3
zbbow1974
 
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i have the exact same issue, i installed a new regulator and the issue remains, i do hear a vaccume leak at the firewall on the drive side, got to put new head gaskets on my ride so i will tackle the leak when i do those, post a reply if the regulator is your issue please
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Old 03-04-2014, 08:57 PM   #4
Charlieg3
 
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The car runs the same with the fuel pressure regulator hooked up or unhooked to the vacuum hose.
The fuel filter is clean, but I need to check the sock on the fuel pump.
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Old 04-22-2014, 08:06 AM   #5
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Turns out the fuel pump was bad, replaced it and it is running fine.
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Old 04-22-2014, 11:42 AM   #6
88 orangepeel notch
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Good to hear, and thanks for the update.
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Old 04-22-2014, 11:42 AM
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