Fuel bypass regulator... before or after
#2778938
05/27/20 11:26 PM
05/27/20 11:26 PM
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BloFish
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Can anyone tell my why I can’t or shouldn’t run the bypass regulator before the carbs? Aeromotive says it should only be installed after the carbs, as in this diagram.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Fuel bypass regulator... before or after
[Re: BloFish]
#2778942
05/27/20 11:56 PM
05/27/20 11:56 PM
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CSK
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I have run it right before the carb & it works great, for a street set up it would be better after for keeping the fuel cool.
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: Fuel bypass regulator... before or after
[Re: CSK]
#2778957
05/28/20 01:41 AM
05/28/20 01:41 AM
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BloFish
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So if the regulator was before the log, it essentially a dead head system? There seems to be many ways to skin this cat.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Fuel bypass regulator... before or after
[Re: BloFish]
#2778959
05/28/20 01:47 AM
05/28/20 01:47 AM
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CSK
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no its not a dead head, it is still returning the unused fuel.
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: Fuel bypass regulator... before or after
[Re: BloFish]
#2778982
05/28/20 07:10 AM
05/28/20 07:10 AM
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TRENDZ
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Not sure about the porting in the regulator. If the flow area in the regulator is large enough to feed the carb without restriction, I can’t think of a reason it wouldn’t work fine. That picture also says to return to top of tank.... so take it as more of someone’s recommendation than the correct way to use it.
"use it 'till it breaks, replace as needed"
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Re: Fuel bypass regulator... before or after
[Re: TRENDZ]
#2779012
05/28/20 09:58 AM
05/28/20 09:58 AM
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Sniper
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I am running a bypass regulator on my EFI swap.
The bypass regulator I am using (Holley 12-886) controls the pressure at it's input and anything in excess goes out the bypass line. So my fuel rail is between the pump and the regulator.
If you plumb it any other way it does not work as designed.
Aeromotive probably knows how to properly plumb it.
You graphic's plumbing does not match the available ports in the picture you also posted. In the graphic I would bet those carb feed ports and the regulator inlet port all are the same internal to the regulator and in essence the carb in the graphic is plumbed exactly like Aeromotive says to do it.
Last edited by Sniper; 05/28/20 10:06 AM.
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Re: Fuel bypass regulator... before or after
[Re: Sniper]
#2779030
05/28/20 11:21 AM
05/28/20 11:21 AM
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BloFish
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You graphic's plumbing does not match the available ports in the picture you also posted. In the graphic I would bet those carb feed ports and the regulator inlet port all are the same internal to the regulator and in essence the carb in the graphic is plumbed exactly like Aeromotive says to do it.
Those graphics are straight from their website. One graphic is for a log feed and the other is directly into to carb.
Last edited by BloFish; 05/28/20 11:23 AM.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Fuel bypass regulator... before or after
[Re: BloFish]
#2779082
05/28/20 01:50 PM
05/28/20 01:50 PM
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Just-a-dart
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I am running that set up. The way the fuel log picture shows is the simplest. The regulator just mounts to the fuel log, clean set up, no drama. My return goes back to a submerged port in the rear of the fuel cell.
It is my understanding that the regulator after the carbs help dampen the pressure spikes in the fuel log
Last edited by Just-a-dart; 05/28/20 02:06 PM.
"Just a Bracket car dressed up like a streetcar"
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Re: Fuel bypass regulator... before or after
[Re: Just-a-dart]
#2779087
05/28/20 02:00 PM
05/28/20 02:00 PM
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BloFish
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It’s all just a bit confusing to me, as some call this set up a bypass system and others such as aeromotive call it a dead head system. At this point, I’m leaning towards putting the regulator after the carbs.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Fuel bypass regulator... before or after
[Re: BloFish]
#2779089
05/28/20 02:08 PM
05/28/20 02:08 PM
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Just-a-dart
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That is a different regulator. for a dead headed system
"Just a Bracket car dressed up like a streetcar"
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Re: Fuel bypass regulator... before or after
[Re: BloFish]
#2779090
05/28/20 02:08 PM
05/28/20 02:08 PM
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fast68plymouth
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The way it’s set up with the picture with the log, the regulator determines the main feed line pressure. If you have the regulator set at 6psi, the whole main feed line is at 6psi.
With the regulator between the pump and the carb, the regulator only regulates the pressure between the regulator and carb....... independently of the main line pressure.
Any regulator with a return line to the tank is by definition not a “dead head” regulator.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Fuel bypass regulator... before or after
[Re: fast68plymouth]
#2779092
05/28/20 02:15 PM
05/28/20 02:15 PM
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BloFish
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The way it’s set up with the picture with the log, the regulator determines the main feed line pressure. If you have the regulator set at 6psi, the whole main feed line is at 6psi.
With the regulator between the pump and the carb, the regulator only regulates the pressure between the regulator and carb....... independently of the main line pressure.
Any regulator with a return line to the tank is by definition not a “dead head” regulator. That makes sense. So is one version better than the other for keeping the fuel cooler and the pump quieter?
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Fuel bypass regulator... before or after
[Re: justinp61]
#2779166
05/28/20 05:32 PM
05/28/20 05:32 PM
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duspan
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do you set the fuel pressure and float level with the car runnning or off?
Last edited by duspan; 05/28/20 05:33 PM.
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Re: Fuel bypass regulator... before or after
[Re: duspan]
#2779172
05/28/20 05:43 PM
05/28/20 05:43 PM
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BloFish
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Running, if using a dead head system.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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