Needing help with wiring at fuse block

GOT the Sucker!

^^^ Exactly. There's a terminal on the starter relay (remote mounted Ford solenoid) that powers up when the starter's cranking. That power goes to the fuel pump on the selected tank. When the engine starts, the oil pressure switch closes and the pump relay is energized through the ignition switch in RUN position. I've jumped the wire from the solenoid to the battery to run the pump and fill the carburetor. I've also run the vehicle by powering that same wire from the ignition key in Start or Run. Not recommended.

Anyhow, OP told me the engine would quit AS SOON as the key was released from Start into Run. Not that it ran in Run till the carburetor ran dry. So the ignition was quitting... He got it to keep running by hot wiring one of the terminals on the Tank Select Valve, so I'm confused about the cause and the cure on that one.

Some relays are controlled by the oil pressure switch voltage routed to the fuel pump relay once the engine has fired, others are wired to the starter motor it has been a number of years since I diagnosed and repaired vehicles, lots of cobwebs and slow firing neurons.

navegator

I've got the diagram on flickR. Used to know how to grab the URL and post here, but they've made flickR so user friendly I can't figure it out anymore. Will work on it...

Meanwhile I spoke with the OP and he's got it running with a connection to the tank select valve. He's backfeeding something, but it's running. Not sure what the long term is. I rigged the one we had, but there wasn't a resistor in line anymore. I don't know if that affected the life of the pumps...

The fuel pump relay should engage for two seconds after which the engine should have fired and voltage from the alternator should be present to maintain the relay in the closed position, check to see that the wiring for the fuel pump relay is not burnt or damaged.

navegator

The '84 E350 460V8 is carburated, if I'm not mistaken. I had a wiring diagram of the fuel pump circuit somewhere here but it's rolled off into archive land and doesn't show up on the search. Maybe one of the other 460 drivers has it somewhere ... GrillMeister may have shared it with me.

The wiring includes the oil pressure switch as part of the start/run circuit, iirc.

Are the fuel pump(s) running when selected during the start attempt? Are you getting fuel to the carb?

Fuel filters have been changed. getting ready to check fuel pump relay. will update soon. thanks everyone for all your help.

brother had a 89 f150 that had bad fuel pumps. Sold it to another guy I know. Make sure that the lines are clean and that the injectors are not clogged up as they can get that way from dirty fuel. May have to pull injectors to either clean or replace, just reread it should be carbed but same thing may have jets all clogged so may need to have carb rebuilt, or replaced. Did you replace the fuel filters may need to do a couple of times.

Ok. here is an update. I got the wiring all put back together and installed 2 new fuel pumps, fuel selector valve and she still tries to start. Cranks but no run.
This is a 1984 Ford E350 with a 460 engine Coachmen Leprechaun.

Need a little more info than that. Year, model and make would be a good start.