Regulator for carb with EFI in-tank pump...
#2593373
12/17/18 09:18 PM
12/17/18 09:18 PM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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My Magnum 5.9 doesn't have fuel pump boss, and I'm tired of the noise from the Holley Red back by the tank. I'm about to go to one of the Spectra EFI tanks but I need to regulate it down for a carb.
Aeromotive makes 3 different regulators with this specific application in mind, but really, whats preventing me from using a plain old bypass regulator that I have lying around? Specifically my old Mallory 29387?
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: Regulator for carb with EFI in-tank pump...
[Re: 67Charger]
#2593383
12/17/18 09:43 PM
12/17/18 09:43 PM
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Joined: Feb 2003
Posts: 8,671
Andrewh
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master
Joined: Feb 2003
Posts: 8,671
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https://www.summitracing.com/parts/maa-2...T0aAuPDEALw_wcBcheck out the comments. you can, as long as it is plubmed right. the guy in comments that didn't is doing the same basic setup you are and the smaller return line is messing him up.
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Re: Regulator for carb with EFI in-tank pump...
[Re: 67Charger]
#2593448
12/17/18 11:14 PM
12/17/18 11:14 PM
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Joined: Aug 2011
Posts: 2,853 Pattison Texas
CSK
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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This is the one I have CLICK HERE
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Regulator for carb with EFI in-tank pump...
[Re: 67Charger]
#2593450
12/17/18 11:16 PM
12/17/18 11:16 PM
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Joined: Aug 2011
Posts: 2,853 Pattison Texas
CSK
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master
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Posts: 2,853
Pattison Texas
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The one you have should work
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Regulator for carb with EFI in-tank pump...
[Re: CSK]
#2593620
12/18/18 06:13 AM
12/18/18 06:13 AM
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Joined: Aug 2005
Posts: 140 Pennsylvania
polaris400cc
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member
Joined: Aug 2005
Posts: 140
Pennsylvania
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I specifically used that regulator on my 95 5.9 Magnum long block with carb. Used 3/8 for return line on my ramcharger and ended up having to run a 1/2 return because of the distance Back to the tank. Was getting some erratic psi numbers at times. Other than that hiccup its been flawless.
I used a 91 OEM plastic tank with stock tbi pump. Drilled a hole on top of tank and used a bulkhead fitting for the return. So I could use the original supply fitting off of the sending unit.
Last edited by polaris400cc; 12/18/18 06:16 AM.
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Re: Regulator for carb with EFI in-tank pump...
[Re: AndyF]
#2593916
12/18/18 07:33 PM
12/18/18 07:33 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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You can mount the regulator back by the gas tank as long as the fuel line is kept cool. The fuel line will be dead headed so it will be more susceptible to heat. But it can be made to work, a lot of new cars are done that way. that's pretty much how our vehicles were from the factory. No regulator per se, but when the inlet needles were closed the fuel was dead heading.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Regulator for carb with EFI in-tank pump...
[Re: 67Charger]
#2593917
12/18/18 07:39 PM
12/18/18 07:39 PM
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Joined: Aug 2011
Posts: 2,853 Pattison Texas
CSK
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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I am in Southeast Tx, it gets hot here, I run 3/8 supply & 3/8 return, all line insulated to keep from heating up the fuel in the tank, regulator is near the carb it works very well, I drive my car & it has A/C.
Last edited by csk; 12/18/18 07:41 PM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Regulator for carb with EFI in-tank pump...
[Re: 67Charger]
#2594655
12/20/18 01:08 PM
12/20/18 01:08 PM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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What I had in mind was putting hthe regulator right next to the tank, and if there IS a vapor issue, either use the vapor return filter to bleed a little fuel back to the tank or use a second regulator at the carb set 1 psi below the back regulator and use the vapor return line as a return line for the minimal return fuel. This way it does not handle ALL the bypass fuel, just the 1 psi difference.
I would think a vapor return filter would be adequate...
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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