alright i am running a mechanical fuel pump but runs through the factory electric pump that doesnt work i can start the motor with starting fluid and it pumps fuel up to the carb with engine running it wont stay running what do i need to adjust help please

 

My "guess" is that the mechanical pump just can't cut it trying to draw fuel through the dead old electric pump in the tank. The electric pump "rotor/gears" are not turning and you are expecting the mechanical pump to pull fuel through that restriction. It may pump fuel up there (it takes starting fluid to give it a "push" as you mentioned), but I believe that this is too much of a drag on the mechanical pump. Have you installed a fuel pressure gauge in the line to see if it maintains pressure after it starts?

It sounds like you may need to drop the tank and either put in a new electric pump and a regulator up front, or ditch the electric pump in the tank and put in some kind of "homebrew" pick-up tube so the mechanical pump can do it's job without interference. Keep us posted and good luck!
Brad