I was having some fuel delivery issues with my car and was thinking that the 25 year old non Stage 1 pump was not keeping up with fuel delivery. I was looking around for a Stage 1 pump and my local suppliers did not show them available as everywhere else. Although I did find one at a Canadian online parts supplier just after I finished making this one. After seeing a couple of custom options that looked to be built from Chevy pumps, I figured I could make one myself. I am sure the Robb MC one is excellent but by the time I got one to me up here in Canada it would have been pushing $300. It is more pump than I need for my engine anyway. I do have plans to swap this engine out with something a little more stout but even then will be under 500hp. I ended up ordering a Carter M4891 from Amazon for $65 CDN. It is rated at 120 GPH free flow so should be plenty of fuel. The body diameter is a little bigger but it still clears the engine ok as seen in the pictures. It comes apart super easy the diaphragm side is screwed together and the pivot pin has a set screw holding it in. I took an old Buick pump from my parts pile and removed the arm from it. The channel on the Carter pump where the arm slides it was just a hair too narrow for the Buick arm. I just grabbed my die grinder and a carbide bur to take a little material off. Maybe 1/16" max. I smoothed it out with a cartridge roll after. To put back together you just put the diaphragm back in and then engage the arm where it holds the diaphragm. You just have to put the pivot pin back in and then the set screw to hold it, after that then assemble the lower bowl assembly with the fittings in an appropriate place to plumb the lines. It all worked out pretty good. It is on the car and running now. Unfortunately it did not solve my engine issues but I can rule out fuel delivery now. It will allow me to supply fuel for any future engine upgrades. I had to plumb a new line so I used 37 deg flare JIC fittings in and out from the 1/4" Pipe thread fitting bosses on the pump. I bent up a new stainless line up to the carb as well. It is a pretty easy build and at a price point that most can afford. I thought I would share for others to replicate if they were interested. Greg
God bless you. Useful info, part numbers, metal tubing on the pressure side instead of cheap hose, photos (in focus, and decently cropped)...and you didn't perpetuate the myth of "AN" 37 degree fittings. WELL DONE!
