[Water Warrior 2]

There should not be any fuel loss from the tank when you remove the gas line from the petcock. The only gas to flow will be in the line itself. When the engine is off there is no vacuum to open the petcock for fuel flow. Just make sure the petcock is not in the prime position. Remove the gas line from the other end too and take it down to the local auto parts store. They will have a variety of filters to choose from. A longer skinnier one may fit better. Anything for a riding lawn more, snowmobile or bike will be adequate. You can also get the little clamps for the fuel line. The little wire clamps that are already on the fuel line are good enough to do the job so a couple more for the filter will be perfect.