2005 Chevrolet Silverado 2500 HD Q&A
2005 Chevrolet Silverado 2500 HD Question: Have to pump gas very slow.
Check the vent hose coming off the fuel tank and coming up to the filler neck. The hose could be restricted. The most probable cause I think would be the EVAP vent valve stuck closed or the EVAP canister restricted. There was a GM bulletin a few years back pertaining to the fuel nozzles at stations causing this and nothing wrong with the vehicle. Have you changed stations recently or does it happen anywhere you fill up? - ProChevy
you should also check to see if someone has tried to steal gas ther should be a preventing flap in the inlet tube to deter this problem - spud40