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Fuel should likely exit anytime the pressure exceeds the overflow valve spring pressure. This is the squeak you hear when pushing the primer on a non-running engine.

Pinch the return line closed with Vice-Grip needle nose pliers, and try again. Report back. Don't run it long if this works. It is just a diagnostic indicator only to check/test/field clean the overflow valve at the return line outlet banjo fitting. Sour fuel could have sludged it in the...