Re: Fuel starvation ???
I think the fuel pump will be fine. Seems like you have tried everthing on the feed side. Lets look at the pressure side. Fuel filter restriction? Float level(both). Wondering if you could check fuel level at idle and rev to 3000 for awhile with veiwer open and see if stays there? I have a high flow filter with stainless steel replaceable element. i have a 375hp engine and drove 360 mile road trip last weekend with a stock mech pump with 3/8 fuel line. Running 3000 rpm for miles. No issues. Even with low fuel light flickers cuz tank low and still fine. I had the same setup with a electric pump back by the tank. I hooked it up to run when key in run postion. wire pushed on at fuse block just in case needed to unhook quickly. Did not have mech at time cuz i did not like duel pump setup. Safety?
When i desided to go back to stock with all metal lines in engine compartment and mech pump, i would run out of fuel. I could drive for miles but if you pushed it or went up a hill i would run out of fuel. Like on the verge of capacity. Replaced fuel pump and still had issue. What i had to do to solve problem, after time. 1) remove electric pump that i left inline,but not using. 2) remove filter i had on suction side of mech pump,paper stlye. 3) Replace fuel rod with lite weight one. 4)Put in high flow fuel filter,don't use paper style. Another note i made sure my power valves were correct size. i had to lower cuz vaccumme was low and could here valve fluttering. Possible drawing in fuel quicker than nessecary, therefore running rich and taking your fuel capacity level down?