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Author Topic: EFI hose routing - two 3/8" rubber hoses  (Read 363 times)
chargerjeff
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« on: August 25, 2021, 12:18:01 PM »

Edelbrock Pro-Flo EFI system. Need to determine the safest routing for the supply and return rubber hoses, engine compartment to fuel tank. Cannot bring myself to drill holes in the bodywork. Axle area seems the most challenging with suspension and a muffler in close proximity. Anyone who's installed dual fuel lines, please share your routing pictures.  E-mail:  bullit_dodge@yahoo.com.  Thanks!
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cdr
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« Reply #1 on: August 25, 2021, 02:19:26 PM »

Edelbrock Pro-Flo EFI system. Need to determine the safest routing for the supply and return rubber hoses, engine compartment to fuel tank. Cannot bring myself to drill holes in the bodywork. Axle area seems the most challenging with suspension and a muffler in close proximity. Anyone who's installed dual fuel lines, please share your routing pictures.  E-mail:  bullit_dodge@yahoo.com.  Thanks!

I used 2 factory -6 {3/8]  steel lines with EFI rubber lines on both ends,
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darbgnik
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« Reply #2 on: August 25, 2021, 06:56:34 PM »

Edelbrock Pro-Flo EFI system. Need to determine the safest routing for the supply and return rubber hoses, engine compartment to fuel tank. Cannot bring myself to drill holes in the bodywork. Axle area seems the most challenging with suspension and a muffler in close proximity. Anyone who's installed dual fuel lines, please share your routing pictures.  E-mail:  bullit_dodge@yahoo.com.  Thanks!

I used 2 factory -6 {3/8]  steel lines with EFI rubber lines on both ends,

What Charlie did is the way to do it. Two 3/8 rubber lines wont fit through the torsion bar crossmember like the factory lines do, but two 3/8 hard lines will. Just probably end up shortening the front side of the factory lines by a couple feet or so(doubtful you could get a bender in there to turn them up the firewall)?
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INTMD8
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« Reply #3 on: August 26, 2021, 06:48:43 AM »

Some may disagree but you can run 5/16 for the return no problem.
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BrianShaughnessy
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« Reply #4 on: August 26, 2021, 07:00:27 AM »

Some may disagree but you can run 5/16 for the return no problem.



Maybe.   1/4" is definitely too small and will cause high FP problems.
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cbrestorations
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« Reply #5 on: August 26, 2021, 07:03:37 AM »

You can use the original hardline as a return and just make another hardline as ur pressure. I wouldn’t use soft the whole length, it’s easier yes but more susceptible to failures down the road
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INTMD8
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« Reply #6 on: August 26, 2021, 07:08:45 AM »

Some may disagree but you can run 5/16 for the return no problem.



Maybe.   1/4" is definitely too small and will cause high FP problems.




I've used 5/16 return on cars with over 1000rwhp.

Used 1/4 on a twin turbo 70 Malibu that made over 600rwhp and I could turn the fuel pressure down to zero with the adjustable regulator.

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cdr
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« Reply #7 on: August 26, 2021, 07:30:52 AM »

Some may disagree but you can run 5/16 for the return no problem.



Maybe.   1/4" is definitely too small and will cause high FP problems.




I've used 5/16 return on cars with over 1000rwhp.

Used 1/4 on a twin turbo 70 Malibu that made over 600rwhp and I could turn the fuel pressure down to zero with the adjustable regulator.


mine would not work with 5/16, not saying that you are wrong, had to have a 3/8 return with my high volume pump.
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INTMD8
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« Reply #8 on: August 26, 2021, 07:56:58 AM »

^ When you were carbureted or fuel injected?

Must be quite a pump in order to not reach minimum pressure with a 5/16 return.
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cdr
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« Reply #9 on: August 26, 2021, 04:19:36 PM »

^ When you were carbureted or fuel injected?

Must be quite a pump in order to not reach minimum pressure with a 5/16 return.

 with EFI Not really that much of a pump, 450lph, I had a short piece of 5/16 efi hose that I had forced on the 3/8 tubing, it was a ,,, crap I need more 3/8 line & the stores were closed, had some 5/16 & wanted to go for a drive. then I forgot it was on there, went from a 255lph pump to the 450lph, & then my pressure was reading about 10 psi higher nothing else was changed, so I backed the pressure back down to 43 psi, THEN when data logging I noticed my pressure would drop about 8 psi, it was because I had adjusted the regulator down & the 5/16 return was a small restriction, I remembered that was on there & replaced with 3/8 & then I had to raise my pressure back up , data logging showed steady pressure after that. as you know a pulse width pump set up would have also solved my problem
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LINK TO MY STORY http://www.onallcylinders.com/2015/11/16/ride-shares-charlie-keel-battles-cancer-ms-to-build-brilliant-1968-dodge-charger/  
                                                                                           
68 Charger 512 cid,9.7to1,Hilborn EFI,Home ported 440 source heads,small hyd roller cam,a518 trans,3.54 gear,11.04@123,4100lbs on street tires full exhaust daily driver
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INTMD8
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« Reply #10 on: August 26, 2021, 04:23:53 PM »

Interesting, haven't had that issue with the 450 pumps and 5/16 return myself but whatever works  2thumbs
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cdr
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Katy,Tx


« Reply #11 on: August 26, 2021, 04:32:38 PM »

Interesting, haven't had that issue with the 450 pumps and 5/16 return myself but whatever works  2thumbs

I know many years ago when we were running Sprint cars on Methanol with a Carb & a belt driven fuel pump we HAD to run a -8 supply & -10 on the return side, with -8 on the return when lifting off the throttle at 8500 rpm into the corner it would overcome the needle & seats & flood out .  put a -10 & it solved the problem
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LINK TO MY STORY http://www.onallcylinders.com/2015/11/16/ride-shares-charlie-keel-battles-cancer-ms-to-build-brilliant-1968-dodge-charger/  
                                                                                           
68 Charger 512 cid,9.7to1,Hilborn EFI,Home ported 440 source heads,small hyd roller cam,a518 trans,3.54 gear,11.04@123,4100lbs on street tires full exhaust daily driver
IMG_1285_Moment(2) by Charlie Keel, on Flickr
INTMD8
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« Reply #12 on: August 26, 2021, 07:17:42 PM »

Oh for sure, I could see that.  With that much volume I'm surprised even one regulator could bypass that much.

Basically what I do is get a pump in the car that will flow enough for the power goal (talking electric not belt drive), loop the feed line to return line (if you want to see if stock sized or some pre-existing line will work) and power up the pump.

If the pump free flowing through the return line doesn't build any pressure, that's the most the return line will ever have to flow and you're good to go after installing a regulator.

If you loop feed to return with no regulator, power up the pump and you start building a bunch of pressure (at the point of connection) then you have some kind of restriction on the return be it the line or otherwise.



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cdr
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« Reply #13 on: August 26, 2021, 07:36:50 PM »

Oh for sure, I could see that.  With that much volume I'm surprised even one regulator could bypass that much.

Basically what I do is get a pump in the car that will flow enough for the power goal (talking electric not belt drive), loop the feed line to return line (if you want to see if stock sized or some pre-existing line will work) and power up the pump.

If the pump free flowing through the return line doesn't build any pressure, that's the most the return line will ever have to flow and you're good to go after installing a regulator.

If you loop feed to return with no regulator, power up the pump and you start building a bunch of pressure (at the point of connection) then you have some kind of restriction on the return be it the line or otherwise.




I dont disagree with you,
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LINK TO MY STORY http://www.onallcylinders.com/2015/11/16/ride-shares-charlie-keel-battles-cancer-ms-to-build-brilliant-1968-dodge-charger/  
                                                                                           
68 Charger 512 cid,9.7to1,Hilborn EFI,Home ported 440 source heads,small hyd roller cam,a518 trans,3.54 gear,11.04@123,4100lbs on street tires full exhaust daily driver
IMG_1285_Moment(2) by Charlie Keel, on Flickr
TexasStroker
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« Reply #14 on: August 30, 2021, 02:58:46 AM »

Yeah, best to run hard lines.  Just replicate what the factory did.  You can even buy (2) new lines and go to town.  I'd go SS, but it is tougher to flare if that is a concern.
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