We've pulled the float out, the U shaped spring is the retainer, it should come out by pulling straight up, the the float and float pin can then come out. You may need to pull the fuel inlet fitting and needle out for the float to come out. Inspect the float for leaks, shake it, listen and feel for gas sloshing about in the float. If it's leaky you will need a new one. Take care with it as new are available, but not cheap.