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Re: 1976 k20 fuel tank switching valve issue
The system at this point is suction. Should be able to either clamp a 3/8 hose down enough to seal at the 5/16 valve or soak a new 5/16 hose in hot water just before sliding it over the 3/8 sender tube.
IIRC - the sender wires are pink and the solenoid valve wire is brown.
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