return line for EFI conversion

I put the Corvette filter/reg on my 65 Dart 273. The Wix one is $20 at O'Reilly's. I used for later MPFI. It regulates ~56 psi, too much for TBI or carb. I currently run a carb off the 9 psi return drop (plus in-line 5 psi reg). This regulator needs to be after the final pump, so if your pump is at the rear you can put the reg right after it and have a short return tube/hose to the tank, as inkjunkie says. That is simplist, but getting at the pump isn't fun, especially for problems on the road.

Running a single tube forward to the engine still follows Bill USN-1's recommendation to return "unused fuel and vapor" to the tank. It shouldn't cause a problem since EFI vehicles have done that since ~2001. I know Mopar Magnum engines started running a single tube then (reg in tank). I understand that was a federal mandate (return-less fuel) to lower emissions by avoiding heating the gas supply via a "to engine bay" loop.

The EFI pump in my Newport and Dart must be below the tank level, since when I test the flow from the supply tube, the gas pours out (maybe 1 gpm), much faster than the pump could flow. I don't think any public road or driveway could have a grade steep enough to starve my pump. I tried a pusher pump in the rear years ago, but it caused more problems than not.