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Regulator for carb with EFI in-tank pump... #2593373
12/17/18 09:18 PM
12/17/18 09:18 PM
Joined: Jan 2003
Posts: 3,031
Erda, UT
67Charger Offline OP
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67Charger  Offline OP
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Erda, UT
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
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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Andrewh Offline
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https://www.summitracing.com/parts/maa-2...T0aAuPDEALw_wcB

check 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.

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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Pattison Texas
CSK Offline
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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

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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Pattison Texas
CSK Offline
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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

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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Pennsylvania
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polaris400cc Offline
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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.
Re: Regulator for carb with EFI in-tank pump... [Re: 67Charger] #2593856
12/18/18 04:51 PM
12/18/18 04:51 PM
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Colorado front range
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BcudaChris Offline
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I saw an install at a show with the Spectra tank that had the regulator on the body just ahead of the tank where the line runs. The return run was 18" or so. He was running a chokeless 4150 of some sort. He had split the output after the regulator to run 1 line to the carb and one to the Nitrous plate. Adjusted initially to 6psi and with fuel flowing into a catch can through orifices that matched his nitrous jetting and and needle/seat orifice flow, then jacked that pressure a bit to keep it fed up top (6.6psi at both the plate and carb inlets. The guy stated that adequate fuel supply and pressure was not one of his problems.

Anyhow, pros/cons of that setup? The packaging is tempting....

Car was a small block brand-X auto with ported factory heads of some sort, headers, 9.0:1, cam, converter, ET Streets, etc. 150 shot. A fairly conservative setup as these things go, and clearly a driver with strip time on it. Not super shiny and with some timeslips getting close to 10's.

Re: Regulator for carb with EFI in-tank pump... [Re: BcudaChris] #2593899
12/18/18 06:35 PM
12/18/18 06:35 PM
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Oregon
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AndyF Offline
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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.

Re: Regulator for carb with EFI in-tank pump... [Re: 67Charger] #2593912
12/18/18 07:28 PM
12/18/18 07:28 PM
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Posts: 403
Colorado front range
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BcudaChris Offline
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Got it. Thanks Andy. Aren't new style return-less systems regulated by varying the pump output?

Also, on the fuel heat, is it less of a concern at carb fuel pressures? and do you think using Parker hose for most of the runs with hard line for the bends and debris prone areas isolate the fuel from conducted heat enough to prevent vapor lock with the extra heat from dead heading?

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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Supercuda Offline
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Originally Posted By AndyF
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.
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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Pattison Texas
CSK Offline
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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.

44598630_1961097237282309_7993352386066251776_n.jpg
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

Re: Regulator for carb with EFI in-tank pump... [Re: 67Charger] #2594655
12/20/18 01:08 PM
12/20/18 01:08 PM
Joined: Jan 2003
Posts: 3,031
Erda, UT
67Charger Offline OP
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67Charger  Offline OP
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Erda, UT
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
Re: Regulator for carb with EFI in-tank pump... [Re: CSK] #2594692
12/20/18 02:59 PM
12/20/18 02:59 PM
Joined: Mar 2003
Posts: 3,358
Berwyn, IL
challenger70 Offline
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Originally Posted By csk
The one you have should work


iagree Went from a barry grant external to an in-tank (tanks, inc.) FI pump setup and the same regulator works like a champ, no issues so far.







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