The Stovebolt Site Forums The Shop Area Engine Shop Fuel injection question - '62 C-10

I plan on installing a Fuel injected v8 in the C-10, which has a 6 in it now. Anyhow, the FI fuel return line is the question: I plan on using the original gas tank and making the original fuel line from it the F.I return line, and then adding a new, 3/8" line soldered into the tank as the F.I. fuel feed line. Has anyone done this before, and if not, how did you approach the F.I. return line matter ?

My buddy put injection on his 69 using the in-cab tank, he welded a bung on the bottom of the tank, & use the original line as return, but I think he cut it off inside the tank so fuel would return higher up in the tank, not right on the bottom.

I did an EFI conversion on my '65 3/4 ton some years back.

Since I was using a Holley ProJection 650 CFI 2bbl TBI kit, it didn't need a lot on the inlet side so I was able to use the stock pickup line. However it did need a larger return line to prevent excessive back pressure which messes with your pressure regulators working pressure.

I used stainless hardline for bolth supply & return lines and used rubber lined adel clamps to mount them to the frame rail with short sections of fuel hose to connet them (I cheated & used an aircraft shop to make the pressure lines using AN fittings, looked very sharp & no leaks!). You'll want a good high flow FI fuel filter between the tank & the pump as well, thankfully the Holley kit came with all of that.

As far as modifying the tank, I took the tank out, rinsed it a few times, aired it out, Then I used another piece of stainless line bent to run up one side of the tank and into the top in a sharp J shape, drilling a hole at the top for it to run into the tank. Then I took it to a radiator shop to have them braze the return line onto the tanks seam and check it all for leaks. To aleviate the whole explosion hazzard they submerge the tank and only expose the area they need to work on.
This is also a good time to have the tank cleaned & coated inside if you dont need a new one outright.
I brought the tank back, figgured where the return line would pass through the floor and drilled an oversized hole so I could instal a rubber grommet and then boted it back in place.
Worked good for the rest of the time I owned the truck.