Fuel pressure regulator?!?
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From: Queens, NY
Car: 87 IROC Z28
Engine: Custom Forged 355
Transmission: 700R4
Axle/Gears: 9" 4:11's Detroit Locker
Fuel pressure regulator?!?
Ok so im dropping the fresh new 355 this weeken, runing the same tpi pump with a holley 3 port pressure regulator, i have 2 ports hooked up now to it, one is blocked off, one for fuel from pump and one for puel to the carb with lower pressure, the blocked one i guess i should hook up to the return line, or leave it blocked...what do i do...this is what it looks like.....the fuel paths at last
out - - out
I
in
out - - out
I
in
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Joined: Feb 2004
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From: N.E. Ohio
Car: 88 Camaro IROC-Z
Engine: SBC 385
Transmission: 700 w/ manual valvebody & 2400 TCI
Axle/Gears: 9-bolt B&W w/ 3.70s
I can't say for sure how the holley works but my Mallory works like this:
4 ports
1 for fuel in (hi pressure)
1 for low pressure out (to carb)
1 for remaining pressure out (back to tank)
1 blocked
Let me also note that with my AFPR I could not get the PSI below 10 and had to add another low pressure (3-12PSI) regulator inbetween the carb and the first regulator to get to the right PSI.
Hope this helps ya
4 ports
1 for fuel in (hi pressure)
1 for low pressure out (to carb)
1 for remaining pressure out (back to tank)
1 blocked
Let me also note that with my AFPR I could not get the PSI below 10 and had to add another low pressure (3-12PSI) regulator inbetween the carb and the first regulator to get to the right PSI.
Hope this helps ya
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From: Queens, NY
Car: 87 IROC Z28
Engine: Custom Forged 355
Transmission: 700R4
Axle/Gears: 9" 4:11's Detroit Locker
thanx, ill play around with it this weekend when i drop the motor so we shall see...
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Car: '89 Firebird
Engine: 7.0L
Transmission: T56
You should probably find out before you run the engine. You absolutely need a return line back to the tank or you'll prematurely burn up your fuel pump. A regulator fuel return port will have a valve to control fuel flow. If you can see straight through then it's just another fuel feed - it is not a fuel return port. If this is the case then you need a different regulator.
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
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The "typical" Holley reg has an inlet port and two outlet ports (one for each bowl, or one to carb and one to pressure gage), no return port.
You need one that regulates pressure by controlling the amount of fuel returned to the tank.
You need one that regulates pressure by controlling the amount of fuel returned to the tank.
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From: Queens, NY
Car: 87 IROC Z28
Engine: Custom Forged 355
Transmission: 700R4
Axle/Gears: 9" 4:11's Detroit Locker
yeah, ill run teh holley to get it runnin ya know, but i need teh better one, but i donno which one, i heard mallory is pretty decent with their 4 port regulator...which one tho....any links, numbers for me...thanx guys...
Joined: Mar 2001
Posts: 10,405
Likes: 2,081
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Personally, I wouldn't run it at all like that or you can risk burning up the fuel pump. You'll be operating the car for at least 30 minutes just for initial break in. I'd rather change a regulator than change a fuel pump!
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Thread Starter
Supreme Member
iTrader: (1)
Joined: Dec 2003
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From: Queens, NY
Car: 87 IROC Z28
Engine: Custom Forged 355
Transmission: 700R4
Axle/Gears: 9" 4:11's Detroit Locker
hmmm...no need to break in the motor, its already been broken in adn all,
but i wanna get a return stule regulator, but which one...i donno...anyone know...
but i wanna get a return stule regulator, but which one...i donno...anyone know...
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Joined: Feb 2004
Posts: 159
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From: N.E. Ohio
Car: 88 Camaro IROC-Z
Engine: SBC 385
Transmission: 700 w/ manual valvebody & 2400 TCI
Axle/Gears: 9-bolt B&W w/ 3.70s
Here it is.
...Taken from a tech document at www.thirgen.org
www.thirgen.org
AFPR option: There are two AFPRs at the time of this writing that I know of. One is made by Mallory (p.n.: MAA-4309) the other by Barry Grant (p.n.: 132-171021). Again, which is better is mostly personal preference. Note that there are three lines from the fuel tank on the drivers side under the master cylinder. One is fuel delivery, one fuel return, and the other goes to the charcoal canister behind the headlights. The fuel delivery line is slightly thicker than the return. Go to your local hardware store and buy some 3/8" pipe thread to 3/8" hose nipple fittings, and put one in each port of the AFPR with a good coat of thread sealant. Plumb a hose from the fuel delivery line to the suitable port on the AFPR, and do the same with the return. Finally, run a line from the pressure port on the AFPR to the carb. Remove the hose that's on the line going to the charcoal canister (remove the whole canister if you want), clamp a length of 3/8" hose onto the end of the hard bent line, and rout it out of the engine compartment somewhere. Mine exits in front of the left tire. This is necessary to vent pressure buildup inside the tank.
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From: Queens, NY
Car: 87 IROC Z28
Engine: Custom Forged 355
Transmission: 700R4
Axle/Gears: 9" 4:11's Detroit Locker
it runs nice with the holley, but im gonna geta mallory one this week...
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