Re: converting 2 line pressure to 1 line fuel pump
this came from jay_merrill
a little different take on it.
I have one '58 Evinrude Bigtwin that I converted the same way. As I'm sure you found out, you have to mount the fuel pump on the upper cover, upside down, because the top of it will hit the rod under the flywheel if you don't. Another way to do it (which I did on my other Bigtwin) is to use an intake cover off of a 28hp or 33hp. They are identical to the older cover with one difference - the mounting point for the fuel pump is very slightly lower, which allows the pump to be mounted at the top position, right side up