Mechanical Fuel Pump issue?

[Anchor1800]

I've been lurking in this area all summer trying to get to the bottom of my engine shutdown issues. The long story short is that the engine will shut down after several minutes of running at half or higher power under a load, but seems to be able to run for extended periods while idling.

Early summer I rebuilt my carb and decided to yank off and look at the mechanical fuel pump at the same time. I found a broken spring in the fuel pump, replaced that during my rebuild with the kit from moyer. I thought this would help resolve my issues, I wrong.

So I decided to get the shutdown warning system from moyer and add a fuel pressure gauge while I was at it, it is all installed as of today, but the warning system hasn't been wired up yet.

Current behavior is that I can pump the fuel pump manually and get 6 psi at the carb. But once started and while running at an idle I am barely above 1 psi, and if I throttle up the pressure drops to barely registering above 0 on the gauge. While running I can manually pump the fuel pump and get it back up to 6 psi, only take 2 or maybe three pumps to get it there. While doing this I can feel the rod from the engine trying to run the pump.

Before I yank off the fuel pump again and take a look to see if I did something wrong, does anyone have any other areas to look into or any thoughts on my issue?

I did a bunch of other unrelated work on the engine back in the spring, I upgraded to electronic ignition, and replaced the plug wires, along with checking that other parts of the electrical ignition system were working.