I'm having a fuel starvation problem on my '78 300D; it just isn't getting enough fuel when I push the accelerator pedal to the floor. I've been running it on WVO for the past 2 years. It has gotten progressively worse on power, and now it takes forever to get up to speed on flat ground and barely goes uphill at all.
So far, I've replaced 3 injectors that were bad, had the valves adjusted, replaced the in tank fuel filter and cleaned the line from tank to front. I've also changed out the hand primer which was leaking air, but that didn't help either.
My question is does anyone think that an auxilary fuel pump can cure this problem? Do I need a new primary fuel pump, or should I just try adding an auxilary pump first?