Fuel return line

[Rusty 72]

Hi

I have a question about running a fuel return line.
I just installed a 5.9L (truck) magnum in my 1972 Charger. I am using an electric fuel pump since the newer magnum has no eccentric for a mechanical pump. I have a regulator with a fuel return line that I want to run. I've routed all new 5/16 fuel lines. I want to use my old fuel tank sending unit since it was working just fine and was reading correctly before I swapped engines.
My question is, where should I plump the return line into? I was thinking just attaching it to one of the new tanks evap lines? The lines that go directly into the tank, not the little secondary expansion tank which is still in good condition and I am still hooking up. I'm not using the overall evap system because all the engine stuff was yanked years ago by a previous owner.
Sorry if this has been covered before. I wasn't able to find an answer by searching.

Thanks in advance, Jeanette

 

[Lionized]

If you're able to pull the sending unit without too much hassle I would simply drill a hole and use a 1/4" bolt on barb fitting. Use nylon washers on either side with the correct threaded nut to secure it from behind.

Just a suggestion.

 

[Rusty 72]

Thanks! I hadn't thought of that. That's exactly what I'll do.

 

[70chall440]

If you look around you can find sending units that have a return nipple or one that can be used for that purpose. I've done it many ways to include drilling the hole and used a bulk head fitting, welded in a fitting to a tank, used existing inlet/outlets, etc. So long as what you connect to returns back to the tank you are good.

 

[Frankb]

The fuel return line should be plumbed to near the bottom of the fuel tank. The return fuel should not be splashed into the tank from above.
Frank

 

[70chall440]

Well, all 3 of mine plus the one I am doing now has the return line up near the top of the tank, I haven't any problems on my 3, don't know about the I am building now because I am not there yet.

 

[Frankb]

You can put the return line anywhere you want. I would think most people simply plumb the line to an existing fitting at the top of the tank and leave well enough alone. Lots of cars on the road like that without any problems. The correct way, however, is to plumb the line to the bottom of the tank.
Frank