Re: Help with fuel return line, will this work?
[Re: Charger446]
#2487850
04/25/18 04:46 PM
04/25/18 04:46 PM
|
Joined: Jul 2011
Posts: 817 Eugene, Oregon
Secret Chimp
super stock
|
super stock
Joined: Jul 2011
Posts: 817
Eugene, Oregon
|
When you're doing a return system you typically place the regulator after the carb supply, before the rest of the return line. This maintains the pressure throughout the entire carb circuit. If you look at any fuel injected car's fuel rail, you'll always find the little pressure regulator dampener at the end of the rail. Unfortunately this requires a "return style" regulator - you can't use many types of deadhead regulators in a return-type configuration from what I understand, since they aren't designed to maintain pressure under constant circulation. Here's an article that details the differences between the regulator types: http://www.onallcylinders.com/2017/01/12...e-fuel-systems/
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
|
|
|
Re: Help with fuel return line, will this work?
[Re: Charger446]
#2488234
04/26/18 01:21 PM
04/26/18 01:21 PM
|
Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
master
|
master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
|
I run a return type regulator on my '70 with carbs.
It bleeds of both from the high pressure side and the regulated low pressure side of the regulator. It's basically a controlled leak to the fuel tank through two separate hoses that each have a restricting jet in the line. The hoses join together after the jet and flow back to the tank in one line.
You can plumb your system the way you described with your dead head regulator, but you will probably want to restrict that flow back to the tank. Otherwise you fuel pump will be running at near full capacity to maintain pressure. Once your carbs are wide open, you may not have enough flow to keep up with a 1/4" hole in your low pressure side.
You can also run one of those 3 nipple fuel filters that come with a metered third nipple.
Insulating your fuel lines around your engine and exhaust can also help keep your fuel cooler.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
|
|
|
Re: Help with fuel return line, will this work?
[Re: jbc426]
#2488260
04/26/18 02:04 PM
04/26/18 02:04 PM
|
Joined: Dec 2012
Posts: 282 Northeast MA
Charger446
OP
enthusiast
|
OP
enthusiast
Joined: Dec 2012
Posts: 282
Northeast MA
|
Thank you for the replies guys, great information to digest. I am still leaning towards a simple solution, I definitely will be wrapping the fuel lines. I had this set up before in my car w/o issues but I was running a glass hood with a tall scoop so there was plenty of air coming in that area but now I have a steel hood w/o the scoop. JBC426, do you know of a supplier of the filter with the metered nipple? I thought they were just 1/4. https://www.youtube.com/watch?v=YUmaAQoHggMI kind of like this guy's idea, thinking I can adapt that with AN fittings and some sort of metering "jet" to get me to the .060 return size, I think the stock Mopar vapor separators calls for that? I could definitely be wrong here though.
Last edited by Charger446; 04/26/18 03:44 PM.
|
|
|
Re: Help with fuel return line, will this work?
[Re: Charger446]
#2489017
04/28/18 11:57 AM
04/28/18 11:57 AM
|
Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
master
|
master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
|
I've seen the 3 nipple Fram fuel filters hanging on the wall with the rest of the fuel filters at local auto parts stores.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
|
|
|
Re: Help with fuel return line, will this work?
[Re: 451Mopar]
#2490100
04/30/18 07:07 PM
04/30/18 07:07 PM
|
Joined: Sep 2007
Posts: 145 NJ
cb1289
member
|
member
Joined: Sep 2007
Posts: 145
NJ
|
A simple vapor return line like what you want to do works great at eliminating vapor lock. The line must be restricted as mentioned. How you plumb it is your business but it works great. I did the same system on a 65 Satellite 413 with dual quads and the throttle response was crisp like fuel injection with my vapor lock issues a thing of the past. That was in the 1990's and the same system is still working great today on the same car. This is basically the same thing the factory did in the 80's to combat vapor lock with the fuel filters with the 3 nipples. R. Eherenberg did an article many years ago in Mopar Action describing this same cure for vapor lock. Good luck.
Last edited by cb1289; 04/30/18 07:09 PM.
62 Dodge Dart Wagon
65 Plymouth Satellite
|
|
|
Re: Help with fuel return line, will this work?
[Re: cb1289]
#2490516
05/01/18 04:07 PM
05/01/18 04:07 PM
|
Joined: Dec 2012
Posts: 282 Northeast MA
Charger446
OP
enthusiast
|
OP
enthusiast
Joined: Dec 2012
Posts: 282
Northeast MA
|
Thank you guys!
I was going to try to stay with using AN fittings so the 3 prong filter may not be the way to go for me, but I like the holley jet idea, what size did you use?
Last edited by Charger446; 05/01/18 05:37 PM.
|
|
|
|
|