Cannot fill the fuel tank. Gas Station pump keeps kicking off.

What is your question?

Dropped the evac canister under the tank and blew through it. Clear! When I add air into the outlet hose off the canister I get some air pressure coming back out. Some air does come out the vent at the filler neck but it isn't clear. there is a restriction of some sort but the vent line except for some small pieces of hose is steel. Put som airtank pressure to it but didn't help. Any other ideas besides dropping the tank and replacing everything. What seems to make the problem better or worse? Problem just started a week ago. Figured the stations evap hose was messed up.