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Topic: Fuel pressure question.... (Read 3833 times) previous topic - next topic

Fuel pressure question....

O.K., I mildly looked for a thread on this, and didn't see one. What is the recommended fuel pressure at idle, and setting (5.0 SEFI, 24# injectors...info in my sig). Where should I set the AFPR and so on? Thanks.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Fuel pressure question....

Reply #1 –
around 40 41 with the vacuum disconnected is a good start

Fuel pressure question....

Reply #2 –
Thanks. I'll install the AFPR asap and set it where I need it. I THINK it was set to 42 with my 19# injectors. I'll keep it at the stock numbers for the 24's.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Fuel pressure question....

Reply #3 –
when I ran 24's I bumped it a little higher .......... but all I want to do is go fast lol

Fuel pressure question....

Reply #4 –
Fast is fine, but I don't want it to be running too rich. What should the gauge show with the vacuum line hooked up after it's set with the hose off?
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Fuel pressure question....

Reply #5 –
rated flow is 43.5 psi, but I believe the computer expects 40 psi.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Fuel pressure question....

Reply #6 –
Around 35

Fuel pressure question....

Reply #7 –
With the current FPR it was reading about 22 at idle with the vacuum hose hooked up.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Fuel pressure question....

Reply #8 –
to low set it to 33 ish


what pump do you have

Fuel pressure question....

Reply #9 –
Haystacks is correct most all injectors are rated at 43.5 PSI for  flow at rated output. And an injector should never be operated past 80% DC. I would set the regulator at or around 44 LBS NO VACUUM. 22 lbs is ABSOLUTELY NG even for a stock setup. Better find out why your fuel pressure is so low before jumping in to new injectors or a regulator. Your car must run terrible if this is the fuel pressure you are running. And you could very well have leaned the motor out drastically. Better check that out real fast. Good luck
I spend money I don't have, To build  cars I don't need, To impress people I don't know

HAVE YOU DRIVEN A FORD LATELY!!

Fuel pressure question....

Reply #10 –
It has a 255lph pump. I have been wondering if it's pumping the fuel that it should be. I have had 24# injectors on the car for some time, and was running my Kirban adjustable fuel pressure regulator. When we were installing new rings and bearings, and had everything apart, I misplaced my Kirban and installed a factory FPR that I had in my desk drawer in the garage. I have since found the Kirban, but haven't installed it yet.

So, should I install the Kirban, check the pressure and go from there?
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Fuel pressure question....

Reply #11 –
put it on and see what happens if you try to crank the pressure and it wont go you probably have a week pump or clogged filter

Fuel pressure question....

Reply #12 –
I'll get after it tomorrow. I'll start with the FPR, then, if necessary, the filter and if I have to, I'll order a pump. I appreciate you guys. If there are any more comments, or lessons, or whatever, keep it coming.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Fuel pressure question....

Reply #13 –
you can check to see if the stock regulator is bad if there is any fuel in the vacuum line

Fuel pressure question....

Reply #14 –
No fuel in the vacuum line. I've had that off a short time ago when I was swapping the valve covers and had removed the upper intake.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..