thafox
+1y
1st thing, there should be some fuel shoot back at u if you have the lines loose if it's pumping enough pressure, 2nd question i dont really understand...your unhooking the return from the injectors? if so that shouldnt cause air in the supply. 3rd question if the bubble doesnt get pulled in try gravity feeding the pump placing a tank higher than the pump and see what happens, if it works make your way back replacing the external supply pump to your seperate container, if still works check your lines to make sure you dont have one chaffed or whatever,4th question make sure you've got good power going to your sol on the pump or even pull it out and put power to it as well just to make sure, you shouldnt have fuel come out of the lines if it's a bad sol but by looking at the rubber stop on the sol u can tell if there's metal or not in the pump (hopefully not), also might want to pull the return fitting off the pump check it, possibly leave it off see if anything changes when cranking could be blocked if it's been sitting for a while