Seems like my gas gauge is stuck on 1/2.  This happened once before and I ran out of gas.  I put some gas in the tank and blew air from the front to the rear of the gas line and then from the rear to the back and it cleared it up.  I hate to keep doing this, but it seems like whenever I try to fix something I know nothing about I mess up.  Should I go ahead and replace the sending unit or try something else.  All help will be appreciated.