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Re: Gas tank
When filling the gas tank, the tank is suppose to vent out. It used to vent out to the atmosphere. But due to environmental restriction, it can no longer vent out to the atmospher but instead the pump noozle has a device that allows it to capture the vented gas. I suspect that somehow that feature is not working, more than likely in your truck because you said you tried various pumps. Check out your Evaporative Emission Control System (EECS).
EECS consists of a charcoal-filled cannister and the lines connecting the cannister to the fuel tank, ported vacuum and intake manifold vacuum. Fuel vapors are transferred from the fuel tank, throttle body and intake manifold to a cannister where they are stored when the engine is not operating. When the engine is running, the fuel vapors are purged from the cannister by a purge control solenoid, which is PCM controlled, and consumed in the normal combustion process. Might be worthwhile checking this system before deciding to pull out the tank.
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