North American Turbocoupe Organization



Crazy fuel Pressure
s10den Offline
Junior Member
#1
Good Morning All, I have a 88 t-bird with a problem. I retired recently and finally found time to work on my Tc. While I was still in the work force I purchased some well needed parts and stored them for after retirement. Anyhow the car has sat for a few years and now started the upgrades. I replaced the entire fuel system. New tank,pump,filter,regulator. Problem I am running across is fuel pressure, I have bunches. My new pump is a 255lph Walbro unit which puts out 150 lbs of pressure. I installed a Kirban adj.regulator but cant seems to get the pressure under 100 psi. In fact it layed fuel all over my floor out the header. So I put the new stock regulator back on and the same thing. I got these reading with the engine off and the key on and jumped the fuel pump to keep it on. Have I missed something? Also will the stock regulator the pressure being put on it?
denny sweet
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Jeff K Offline
Administrator
#2
Return line is pinched or plugged somewhere between the fuel rail and the tank.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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s10den Offline
Junior Member
#3
Good call Jeff never thought of the fuel return. been playin with a carbed truck. So that would explain the adjustable regulator not responding to an adjustment. I will get on it in the morning. Thanks for the advice Jeff.
denny sweet
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s10den Offline
Junior Member
#4
Well Jeff Korn was right, About a yr ago I pulled the gas tank and ordered a new one. While the tank was out I injured my back at work. Meantime the tank had come in and I had a rollback take it to a local shop to put the tank in for me. What happened is a Mud Dabber had made a nest in the return line. Removed the tank yesterday found the problem and now runs like a clock. Thanks to this message board for all the help
denny sweet
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Jeff K Offline
Administrator
#5
Glad I could help!
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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anasazi4st Offline
Senior Member
#6
s10den Wrote:Well Jeff Korn was right

As if there was any doubt. Cool :notworthy:

Thanks, Jeff, for all your help!
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 1 T5OD full rebuild, 5 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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Cliff.C Offline
Member
#7
Your 1 smart cookie !!
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Jeff K Offline
Administrator
#8
Actually, if you understand exactly how the fuel supply system works, a plugged return line is the only possible cause of uncontrolled high fuel pressure. Not really rocket science.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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