How would you run the return ??

Demonracer said

I did a conversion to EFI using the metal fuel tank recently. I used a fitting similar to the one bulkhead referenced in post #2. I drilled the tank with the sending unit out and was able to get my arm in the sender hole to tighten up the nut on the bulkhead fitting. The customer is driving it now with no leaks.

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That’s what I was thinking. I know my arm won’t fit in that sending unit hole.

When I added the sump on my tank I also added a return line fitting. Since I had the welder out I just welded a fitting in.

If you can get your hand in there to get to the nut on the bulkhead fitting that is his best option.

Maybe I should have had my kid go out there with his skinny 15 year old arms (he‘s 22 tomorrow) and do it but like I said, I had the welder out so I did it myself.