Adding Fuel Return line to 1970 Mopar
can i just punch a hole in the corner of the tank install a fitting and fabriate a return line? im just scare there will be venting issues since the return line will bring the fuel back with pressure 6-8 psi.
I added a return on my 67, which of course never had one. As above^^ I drained the tank, and plumbed the MIG bottle to the feedline. (I use pure CO2) "backfill" the tank with CO2 at low pressure. Then get up in there next to the sender. Take a sharp "awl" and punch a hole, after first cleaning it well. the punch (not drill) will avoid chips, and will leave a rolled lip, making it easier to silver braze. We used to call this "silver solder" but the proper name is "silver braze."
If you are concerned about fuel aereation in the return, either do install it low in the tank, or just use a longer tube and stick it 'down' into the tank towards the bottom.
You can use about anything your skill level requires. One mistake I made was to use too small tubing, which ----later when I went EFI-- kinda bit me back. So I would us a 3/8 piece of tube, or even a brass or steel no6 fitting.
The sender you posted will work, too, but as mentioned above, "repop" senders have a horrid track record for calibration issues