"FatOrangeKat", it isn't "common" but a lot of people recommend and use them. To those people: congratulations. I believe if your fuel is clean when it comes out of the supply jug it will be clean when it gets to the engine. A filter can clog, causing endless tuning problems, and the two filter connections are just two more places for leaks to occur.

I use a sintered bronze filter in my supply jug and an inline filter in the supply line. I usually use a sintered bronze filter in the tank. I have never had a problem with dirty fuel, nor do I have many engine tuning problems.

Dr.1