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Hello, my name is***** usually means the fuel tank itself is the problem. Check the canister vent solenoid hose for any obstruction and clean or repair as needed. If the vent hose is not restricted, remove the canister vent solenoid from the canister. Verify that it is open and free of any restrictions. If not, replace and retest. If the vent solenoid is OK, check the charcoal canister for any restriction. Repair/replace as needed and retest. If the canister appears free of any restriction, remove the fuel vent hoses as close to the fuel tank as possible. Try filling the fuel tank with the hoses disconnected at the fuel tank to see if it fills as it should, or if the gas pump still wants to click off too easily. If the problem is still present, verify there is no obstruction in the filler neck. If the filler neck is OK, suspect a problem with the vent valve(s) in the top of the fuel tank which would require tank replacement. Let me know if you have more questions or if there is anything else I can do to help. Thanks.