I bought a 93’ f-350 with a 5-speed manual trans. I was letting a buddy use it for a while and he tried to put electric lift pumps in as well as his own fuel lines. I got it back and after replacing the fuel lines and putting a mechanical lift pump in, it won’t start. I bled the injector lines. The batteries are good. I’ve tried plugging the block heater in. It still won’t turn over. I hold the key over for about 5-10 seconds and it’ll act like it’s about to turn over but nothing happens. I know using too much ether on hot glow plugs isn’t good. Any suggestions?