Anyone know what the exact thread size for the factory fuel return lines that come out of the heads are? I need to know the fitting that goes into the fuel bowl. That will be the end that I will be putting on my new regulator. I was told by Tom S. that he thought they were -4AN fittings.
I am gathering parts to swap in a Super Duty electric fuel pump and would like to get the proper fittings so I can retain the stock lines.
I am gathering parts to swap in a Super Duty electric fuel pump and would like to get the proper fittings so I can retain the stock lines.
