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Fuel pressure regulator

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Old 02-26-2014, 07:05 AM   #1
Charlieg3's Avatar
Join Date: Feb 2014
Vehicle: 1990 mustang gt
Location: Arkansas
Posts: 7
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, 02:50 PM   #2
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Vehicle: 1990 Ford Mustang GT
Location: New Hampshire
Posts: 296

I had a similar problem and it was the regulator...I would put an adjustable in since you have heads and injectors..etc
trick flow street upper and lower intake, bbk 70mm throttle body, bbk afpr, walbro 255,shorty headers, catless h-pipe, bassani stainless cat back, tremec tko, centerforce df clutch, aluminum driveshaft, full length sub frames, chrome cobra r's, eibach pro-kit, 9mm plug wires, mac cold air, pro 5.0 shifter, sn-95 maf, autometer phantom gauges, cervini's stalker front bumper, cobra r svo hood, 93 cobra wing
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Old 03-02-2014, 05:41 PM   #3
Join Date: May 2012
Vehicle: 95 mustang gt
Location: kentucky
Posts: 26

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, 07:57 PM   #4
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Join Date: Feb 2014
Vehicle: 1990 mustang gt
Location: Arkansas
Posts: 7

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, 07:06 AM   #5
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Vehicle: 1990 mustang gt
Location: Arkansas
Posts: 7

Turns out the fuel pump was bad, replaced it and it is running fine.
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Old 04-22-2014, 10:42 AM   #6
88 orangepeel notch
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Vehicle: 1988 notchback
Location: Wisconsin
Posts: 2,763

Good to hear, and thanks for the update.
306 with all bolt ons, letter cam, ported E7's, T5 swap, full exhaust, 3:55's, 2" drop, and the worst paint you'll ever see or feel.
Dyno'd 300/316, 2745lbs-track scale
Best ET………12.4@108, 1.66 60ft on 8" ET Drags.
24 mpg (combined)
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Old 04-22-2014, 10:42 AM
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