When you hit the Tank swap switch. Are you sure it actually swaps your tank over? It could not be switching tanks and it keeps trying to pump fuel from your main tank that you use and the pump on it actually being bad.

 

If you can break the line loose at the filter, have someone turn the key on just long enough to see if your getting fuel to that point. If you are, break the line loose at the back of the fuel rail and check again. Your regulator returns extra pressure back to the tank. So wait before you spend that $$

Please, short checks, we don't want to see another fire in the west, especially usin' a ford for fuel

 

Correct me if im wrong but do these old trucks have inertia switches? That could be your problem if they do

 

Yes they do. Well I know 92-96 does have them on the passenger side behind the kick panel

 

Older has it above the brake pedal on the firewall.

 

i don't have any idea how i could have kicked the inertia switch, haven't checked it. today i tried to disconnect my fuel filter and gas sprayed everywhere so i know my fuel pump isn't bad. also have pressure to the fuel rail miraculously. also checked for codes and nothing popped up.

 

When you turn the key over does it try to turn itself over? Or does it just sit there? I may have a possible solution for you.

 

So I broke down and had it towed to a shop. A tow and 2 hours of diagnostics later come to find out the coil was strong enough to spark but not strong enough to start. So I put an oem coil in it and it started but gotta buy a msd coil cuz I did a timing bump and re gapped the plugs and the replacement coil can't light up them plugs right and its kickin my CEL on...