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2001 F80 TLRZ fuel pressure

Would this motor have the VST filter? I have good pressure at the pumps but motor will not stay running. Seems to not be getting enough fuel.
 
An F80TLRZ has carburetors. VST's are used in fuel injected models.

Have someone pump the primer ball, keeping it firm, while you run the motor. Does the motor still die?

Maybe remove the drain screws from each carburetor. Pump the primer ball. Fuel should flow out of each carburetor.

Did this problem just happen?
 
Motor has sat with old fuel for almost 2 years. Drained tank and added new fuel. Bled each carb many times over. Once I pressurize the system it will fire and run for couple seconds then die, even if I keep ball pressurized. Went as far as running line straight from Jerry can with new fuel. If it's getting enough pressure from pumps could farms be gummed up?
 
I suspect that the carburetors are fouled within. Probably have to remove and dismantle them. For a thorough cleaning.
 
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