I, at one time, mounted a flat plate to the outside of a normal bypass cover, with a hole drilled thru to allow the movement of pressure.
I filled the outside cavity of the bypass cover with JB weld to make it easier for the plate to seal against the cover, the plate had the mounting holes for the fuel pump in it so we were good to go. I suppose I could have just made a gasket but what fun is there in that..lol
I’ve converted several by filling the outside of the original cover with jb weld. Then use a belt sander to make sure any excess jb weld is removed and the surface is flat. Finally drill 3 holes and tap the outer 2 to match the thread of the screws for the pump.
Worked just fine for me.
