for starters: 85 f250 4x4 7.5L duel 19 gallon tanks

I wasn't using my truck for a while I was driving my car around but i still ran the truck for about 20 minutes every week.

One day i go out to start it and it ran for about 10-30 seconds at a time then acts like it isn't receiving any gas.

I thought I might have a clogged fuel filter so i went and bought a new one ....It didnt fix it.
I checked the filter in the carb ...It didn't fix it.

Canister where the two fuel lines met was clogged ..so I bought new one ...It didnt fix it.

I then realized that my fuel pumps were not pumping and I was just getting gas by vacuum.
I put in a new oil pressure switch, still nothing.

What the heck is going wrong ?

I dropped my front tank yesterday but i dont know if i want to pay 100 bucks for a new pump just to see if both pumps crapped out on me.

What do you guys recommend.?

Any chance I could be losing oil pressure causing the oil pressure switch not to work ?

or

Is there a fuel pump relay in my truck ?

or

maybe just both fuel pump screens may be clogged.?

ANY SUGGESTIONS willbe appreciated.

I NEED and Want my baby back on the road asap

 

There is a fuel pump relay in the eng compartment maybe on the left fender?

 

There is a fuel pump inertia switch on the pass side of the transmission hump under the dash(that's where it was on my late 85 built 86.) If it will fire while cranking, it's the inertia switch or the oil pressure switch. To verify this, pull the wire that is hooked to the hot in start terminal on the solenoid(should be the forward small terminal, IIRC, the wire is pink with a black stripe, pull one, and, if it still cranks with the key, you've got the right one unhooked) and run a jumper between it and the positive battery terminal. This should make your fuel pumps run, if it doesn't it's either the relay(drivers side firewall, close to the fender,) your grounding for the pumps, or the pumps themselves.
Evan