Fuel Pressure Regulator
#1
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Car: 1986 Camaro Sport Coupe
Engine: 383 Stroker
Transmission: stage 2 2004r
Axle/Gears: 3.55
Fuel Pressure Regulator
Hi,
I just got done with my tpi to carb swap and I have a 255lph in tank pump with a Holley billet regulator. The regulator can only regulate down to 7psi. Can I run a deadhead regulator after the bypass regulator? Will it hurt the pump at all?
I just got done with my tpi to carb swap and I have a 255lph in tank pump with a Holley billet regulator. The regulator can only regulate down to 7psi. Can I run a deadhead regulator after the bypass regulator? Will it hurt the pump at all?
Last edited by 86Base; 06-12-2016 at 07:56 PM.
#2
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Car: 1990 IROC
Engine: Rebuilt L98 with H/C/I/Carb
Transmission: TH350 with ATI Treemaster
Axle/Gears: 7.5 with 4.10's
Re: Fuel Pressure Regulator
If you can't get it to regulate down past 7psi, it could be an issue with the return line. I have the aeromotive regulator on my car and had a similar situation. I had to fix some kinks in the return line to get things sorted out.
#3
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Car: 1986 Camaro Sport Coupe
Engine: 383 Stroker
Transmission: stage 2 2004r
Axle/Gears: 3.55
Re: Fuel Pressure Regulator
I can check the return line but there is no issue to my knowledge. Do you have a 255lph pump? what can you put your pressure down to?
#4
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Car: 1990 IROC
Engine: Rebuilt L98 with H/C/I/Carb
Transmission: TH350 with ATI Treemaster
Axle/Gears: 7.5 with 4.10's
Re: Fuel Pressure Regulator
I do have a Walboro 255 pump and I have my pressure set at 5.5 psi. I never tried to take it lower than that, but I think it would go lower if I tried.
#5
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Car: 1986 Camaro Sport Coupe
Engine: 383 Stroker
Transmission: stage 2 2004r
Axle/Gears: 3.55
Re: Fuel Pressure Regulator
Which regulator do you have? Maybe the regulator isn't a good one. I might have to switch to an aeromotive
#6
Supreme Member
Re: Fuel Pressure Regulator
I have used the very affordable Mallory 4309 regulator on multiple EFI-to-carb swaps over the years. Never a problem. Including applications where the fuel pump has been upgraded to a Walbro 255. If you can't get pressure low enough with that regulator, you have a restriction in the return line, in all likelihood.
[edit] Mallory/MSD changed the part number. And doubled the price. Don't believe me? Here they are on Summit, both old (4309) and new (29387) part numbers:
4309 (old part number, no longer available, but you'll have to trust me, it used to be about $60):
https://www.summitracing.com/parts/maa-4309
And now the new part number for the exact same regulator at $120 each:
https://www.summitracing.com/parts/msd-29387
[edit] Mallory/MSD changed the part number. And doubled the price. Don't believe me? Here they are on Summit, both old (4309) and new (29387) part numbers:
4309 (old part number, no longer available, but you'll have to trust me, it used to be about $60):
https://www.summitracing.com/parts/maa-4309
And now the new part number for the exact same regulator at $120 each:
https://www.summitracing.com/parts/msd-29387
Last edited by Damon; 06-14-2016 at 10:23 PM.
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Car: 92 Camaro Z28
Engine: 383
Transmission: T56
Axle/Gears: 9"
Re: Fuel Pressure Regulator
Check out this page on running a static regulator after the return regulator.
http://www.aeromotiveinc.com/tech-he...ed-regulators/
Also, even with the Walbro pump, getting pressure down shouldn't be a problem (I would think). Mallory lists their regulator as being able to handle 200 GPH which is far more than the Walbro pump puts out.
I would agree with the other poster about checking out the return system first before adding a second regulator, but this page does say that a second regulator can overcome a poor return system.
Hope this helps
http://www.aeromotiveinc.com/tech-he...ed-regulators/
Also, even with the Walbro pump, getting pressure down shouldn't be a problem (I would think). Mallory lists their regulator as being able to handle 200 GPH which is far more than the Walbro pump puts out.
I would agree with the other poster about checking out the return system first before adding a second regulator, but this page does say that a second regulator can overcome a poor return system.
Hope this helps
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#8
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Car: 1986 Camaro Sport Coupe
Engine: 383 Stroker
Transmission: stage 2 2004r
Axle/Gears: 3.55
Re: Fuel Pressure Regulator
Check out this page on running a static regulator after the return regulator.
http://www.aeromotiveinc.com/tech-he...ed-regulators/
Also, even with the Walbro pump, getting pressure down shouldn't be a problem (I would think). Mallory lists their regulator as being able to handle 200 GPH which is far more than the Walbro pump puts out.
I would agree with the other poster about checking out the return system first before adding a second regulator, but this page does say that a second regulator can overcome a poor return system.
Hope this helps
http://www.aeromotiveinc.com/tech-he...ed-regulators/
Also, even with the Walbro pump, getting pressure down shouldn't be a problem (I would think). Mallory lists their regulator as being able to handle 200 GPH which is far more than the Walbro pump puts out.
I would agree with the other poster about checking out the return system first before adding a second regulator, but this page does say that a second regulator can overcome a poor return system.
Hope this helps
An update. I looked for kinks and there are none. But I found out when the car is not running the regulator won't go less than 7psi. I was messing with the regulator and loosened it quite a bit and I started the car and it was running strange and I noticed the pressure was 4.5psi. So it turns out when it's running I have full adjustment range from 4.5 to 9 psi.
Is this a normal thing?
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