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Offline biggrgivens

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fastest best way to create return line for gas tank EFI setup
« on: February 06, 2015, 02:06:58 AM »
Ok, I was just going to swap a bigger new mustangII gas tank on my 72 pinto. I just noticed that the previous installer when going EFI, that he used the vent as return line. I want to use vent as a vent. what is the fastest yet efficient way to return fuel to tank? Do I need to tig in a new return? Can I just drill a hole in new tank and install another crank vent as mod to use as return tube?

Offline dianne

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #1 on: February 06, 2015, 06:00:17 AM »
Ok, I was just going to swap a bigger new mustangII gas tank on my 72 pinto. I just noticed that the previous installer when going EFI, that he used the vent as return line. I want to use vent as a vent. what is the fastest yet efficient way to return fuel to tank? Do I need to tig in a new return? Can I just drill a hole in new tank and install another crank vent as mod to use as return tube?

Does the gas tank setup need to be done differently on the 2.3 EFI?
Vehicles:

- 1972 Plymouth Duster (To be a Pro Street)
- 1973 Ford Pinto wagon (registered ride 195)
- 1976 Mustang II mini-stock
- 1978 Mustang King Cobra II
- 1979 Ford Pinto Runabout
- 1986 Chevy K5 Blazer
- 1997 Suzuki Marauder

FORD: Federal Ownership Respectfully Denied

Offline biggrgivens

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #2 on: February 06, 2015, 10:33:25 AM »
It needs a fuel return line unlike a carbed car.

Offline 76hotrodpinto

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #3 on: February 06, 2015, 11:10:10 AM »
I've heard of people putting the hole through the sending unit mounting plate, rather than the tank.
1976 half hatch 2.3 turbo w/t5.

Offline Wittsend

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #4 on: February 06, 2015, 12:44:15 PM »
I put a return line in through the sending unit. I drilled a hole, put a tightly fitting piece of steel tubing in and soldered it to seal it.  A few points to know:

1. The sending unit nylon seal for the wire melted and I liberally used JB Weld to seal it again.  5 years later it is still holding.

2. I would allow the return line to cross over or run parallel to the existing pick up line and solder it where it does. This allows additional brace points so the pass through point isn't the only point of connection.

3. I would make sure the return line didn't splash into the pick up area.  When the tank is low you don't want it pushing fuel away from the pick up.


Lastly, do at your own risk.

Offline 76hotrodpinto

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #5 on: February 08, 2015, 01:19:55 PM »
Just tape a hose up the side and in to the filler cap, done deal! Use the shiny tape so it looks professional.
1976 half hatch 2.3 turbo w/t5.

Offline amc49

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #6 on: February 08, 2015, 11:28:23 PM »
Build a cup of sorts around the pickup tube and then run the return into it, how modern cars are essentially built. The return serves to keep the pickup cup area full of fuel during turns when a major amount slides away from inertia and with low fuel level. All modules do that now. Many return bypassed fuel right there rather than coming all the way back from front of car.

Offline dianne

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #7 on: February 09, 2015, 06:36:05 AM »
Build a cup of sorts around the pickup tube and then run the return into it, how modern cars are essentially built. The return serves to keep the pickup cup area full of fuel during turns when a major amount slides away from inertia and with low fuel level. All modules do that now. Many return bypassed fuel right there rather than coming all the way back from front of car.

My Spitfire has something like that with a larger tank on top. I can replicate that amc! Thanks!
Vehicles:

- 1972 Plymouth Duster (To be a Pro Street)
- 1973 Ford Pinto wagon (registered ride 195)
- 1976 Mustang II mini-stock
- 1978 Mustang King Cobra II
- 1979 Ford Pinto Runabout
- 1986 Chevy K5 Blazer
- 1997 Suzuki Marauder

FORD: Federal Ownership Respectfully Denied

Offline 76hotrodpinto

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #8 on: February 09, 2015, 11:29:21 AM »
Is there nothing a shot glass can't fix?!
1976 half hatch 2.3 turbo w/t5.

Offline pinto_one

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #9 on: February 09, 2015, 01:47:39 PM »
I have done it a couple of times using aircraft bulkhead fittings , you can place them on the sending unit or dill a hole in the tank to use them, AN832 straight  fitting or AN833 Elbow, or last a AN807 if you just want to hook a hose to it , and use the nut AN924 to back it up,   a dash number at the end of the number gives the size , 1/8 to 3/4 ,  and Dianne I will send you the fed ex shipping number when I drop off your stuff tomorrow,  and also I included the above fittings for your fuel tank,  its amazing
how many aircraft parts end up on my cars  :o
76 Pinto sedan V6 , 79 pinto cruiser wagon V6 soon to be diesel or 4.0

Offline dianne

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #10 on: February 09, 2015, 05:45:24 PM »
Is there nothing a shot glass can't fix?!

So it doesn't have to be as complex as the Spitfire?
Vehicles:

- 1972 Plymouth Duster (To be a Pro Street)
- 1973 Ford Pinto wagon (registered ride 195)
- 1976 Mustang II mini-stock
- 1978 Mustang King Cobra II
- 1979 Ford Pinto Runabout
- 1986 Chevy K5 Blazer
- 1997 Suzuki Marauder

FORD: Federal Ownership Respectfully Denied

Offline amc49

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #11 on: February 21, 2015, 03:42:52 AM »
Dunno what Spitfire looked like but the ones I've seen have a small demand valve or poppet that stays closed until pump demands fuel, it then slips open to let fuel in. On a Focus say, it is only a flat round piece of silicone rubber that lifts instantly on demand but then closes so fuel stays pretty much trapped in the reservoir cup there.

You want instant availability of fuel when needed but cup seals off at fuel sloshing time like cornering. The in-tank pump output has a small amount short-circuited off in a bypass that spills right back into cup to help keep it full.

Offline dianne

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #12 on: February 21, 2015, 08:17:58 AM »
Is this something I can pull from a fox body?
Vehicles:

- 1972 Plymouth Duster (To be a Pro Street)
- 1973 Ford Pinto wagon (registered ride 195)
- 1976 Mustang II mini-stock
- 1978 Mustang King Cobra II
- 1979 Ford Pinto Runabout
- 1986 Chevy K5 Blazer
- 1997 Suzuki Marauder

FORD: Federal Ownership Respectfully Denied

Offline amc49

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #13 on: February 21, 2015, 07:22:29 PM »
If talking Ford parts, in my limited knowledge those type reservoirs started being used say '99-'00 and tied to higher pressure MPFI pumps, of course the reservoir does not care about pump other than if the internal bypass is used it will be rated with a higher pressure check valve based on around 45 psi. Reservoir would not care as well about whether the bypass fuel coming back came from right there in a short loop or all the way from front of car.

Offline pintoguy76

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #14 on: January 18, 2016, 10:10:43 AM »
I stumbled across this thread just now. I thought the second (smaller) line in the fuel sending unit WAS a return line, but you guys are saying that its actually a vent line? I have a 91 Mustang 2.3 DIS in my car. Is this causing me any problems that I am unaware of? Come to think of it, there is a 3rd line up front on the frame rail that I had to cap off, its connected to the fuel system somehow... where could it be coming from? And which one would be the vent and which one would be the return? Car is a 74 wagon, 2.3....
1974 Ford Pinto Wagon with 1991 Mustang DIS EFI 2.3 and stock Pinto 4 Speed
 
1996 Chevy C2500 Suburban with 6.5L Turbo Diesel/4L80E 4x2

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Offline 65ShelbyClone

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Re: fastest best way to create return line for gas tank EFI setup
« Reply #15 on: March 12, 2016, 10:15:42 AM »
I don't know why there would be three lines, but I would guess that at least one was a vent and went to the charcoal canister.

I used the vent as a return by making an aluminum piece to replace the pot metal original (that has a tiny restrictor in it to let vapor out, but not be significant fuel flow path).


It would have been simple to put two fittings in it and keep the original vent configuration. I ditched the charcoal canister when I went 2.3T EFI, so it would have been more work just to preserve a vent line to nowhere.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.