Join Date: May 2006
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Scout II fuel system
Quadrajets are know for problems, especially ones that could be 20 + years old.
I'd pull the fuel inlet line from the carb and test the pump (key on if electric, cranking engine if mechanical pump) to see if fuel is spurting out of the line during this procedure.
If it's doing so, and in sufficient volume, the problem is likely inside the carb.
If little to no fuel comes from the line during the test, the line is clogged. That could mean a fuel tank full of sediment clogging the lines, or a clogged fuel filter some where between the tank and the carb.
The black plastic piece inside the DS quarter panel is an Evaporate canister. It allows for the expansion (and condensation) of the fuel vapors from the tank. This was largely an emissions requirement, but if yours if functional, I'd leave it.