Fuel return line

[JackFish]

I would like to run a fuel return line back to the tank.
Have a fuel regulator with a provision for one, and I think it would help with some of the heat soak issues on these engines.
Most stock setups would appear to for electric in tank fuel pumps for efi systems.
I'd like to keep the stock mechanical pump for the time being.
I'm not sure how to plumb the line going back into the tank.
I've seen some references to cutting a hole in the filler-neck, but nothing specific for a fox-body.
Is there maybe a stock setup that can be utilized?

 

[xctasy]

Your right on the makeshift return line, its easy. There is a specific Fox body kit, though I can't remember the exact VIN code, hp level or part number, but I think if you copy the Fox body 1983 to 1986 5.0 LTD LX 4v 4180c carb or CFI method. There was a fuel tank for sedans and wagons with the 6 code EFI 3.8 or M code 5.0's which used the 165 or 175 hp engine option. It was a hot fuel handling/vapour reduction package solution for Special Police Pursuit vehicles which often used the packages.

If you use the method the early Ford Capris and foreign Pinto 2000 OHC 2-BBL engined cars did, you use a factory special adaptor to the fuel tank with an extra line in at the fuel delivery point.

For me, id just copy Does10's, where he used a big old conventional electric pump, which you can just run a line back above the rear tank fuel inlet where the tail filler goes into the tail. Just a standard fuel grade line into the tank.

From http://www.mustangevolution.com/mustang ... c-mustang/ it runs down the driver’s side of the car, into the trunk, and into the filler neck:
http://www.mustangevolution.com/wp-cont ... cn0015.jpg

The early European 2000 cc Pinto engines( some Mercury Capri till 1974) and


then the Aussie 1982 to 1992 XE/XF 3.3 and 4.1 engines with the Weber 34 ADM 2-BBL Alloy Head II engine used a factory Carter fuel pump with the line included,
See http://www.xfalcon.com/forums/index.php ... ild/page-6

http://i904.photobucket.com/albums/ac24 ... CN0508.jpg
http://i904.photobucket.com/albums/ac24 ... CN0501.jpg
http://i904.photobucket.com/albums/ac24 ... CN0505.jpg
http://i904.photobucket.com/albums/ac24 ... CN0507.jpg
http://i904.photobucket.com/albums/ac24 ... CN0496.jpg
http://i904.photobucket.com/albums/ac24 ... CN0500.jpg


and so did the US 1983 4V 5.0's and 4-bbl 4180c equiped F150 and F250/350/F600 trucks with the 5.8, 370 or 460 engines, they had a US Carter fuel pump with a return line back to the tank early Pinto/Mercury Capri style, and its just like an extra vapour line bleed back from the carbs nominated fuel bowl.

 

[65coupei6]

The easy thing to do is add a Mopar vapor return fuel filter.
You can get them at any auto parts store. Here is what you are looking for http://item.mobileweb.ebay.com/viewitem ... 0834619408

They are around $5. I did this before my electric fuel pump install.

Or do a search here for my fuel pump install to see how I did a return line.

 

[FalconSedanDelivery]

I think he meant to post a Fram G3583 or Equiv , the one in the link is a bit high :arg:

 

[rbohm]

8) i would just set up a "T" fitting between the tank and the fuel pump, and run the return line to the "T" fitting. that way you dont have to modify the tank, or make sure you get the return line far enough down into the tank to minimize the possibility of static electricity being generated as the fuel returns to the tank, and yes it does happen.

 

[65coupei6]

I think he meant to post a Fram G3583 or Equiv , the one in the link is a bit high :arg:

Yes, the one in the link was just to show what it looks like.

With this you don't even need a return to the tank. Just put a "T" in the line where it enters the engine bay.
I got this idea way back when addo posted a pic of an Aussie Falcon and I saw it there.

Here is the best picture I could find.

http://postimg.org/image/q5g3j2ifr/

 

[JackFish]

I already have an adjustable Mallory 4309 pressure regulator with guage, and it has a return line fitting.
I'm not sure that a T-fitting back to the gas line would accommodate an electric fuel pump if I decide to go in that direction. :

The main purpose of this exercise is to give hot fuel a someplace to bleed off.
The secondary is control over fuel pressure so that I can experiment with a bunch of different carbs I have.
I know there were some sending units that head dual nipples, on being for the return, but I'm not sure if one would fit in a Fairmont wagon tank. I've got a spare tank and filler neck so I can putz around with some ideas.

 

[65coupei6]

If you really want to do the return line since you have the regulator. Then weld a bung to the fill neck or to the gas tank. Another route is to use a fuel sender that has a return provision built in. I used a Ron Morris unit: http://www.ronmorrisperformance.com/miv ... _Code=9112

If you are thinking of going electric in the future. You might as well run a new line now for the fuel. Use your current line as the return. This is how I did mine.
http://forums.vintage-mustang.com/mod-c ... -pics.html

 

[JackFish]

Great suggestions thanks.