Well, most (of MANY) of us Giant Scalers prefer to filter the fuel AT LEAST 3 times (yes THREE) before it gets to the engine.
I have a filter in my FUEL jug (clunk filter down in the can), and sometimes an inline is used on the can as well. Then, one clunk filter in my planes fuel tank, and then an inline filter between the tank and the engine. EVEN when all 3 (or 4) of these filters are used, we STILL can find junk/crap in the inline filters after just 25-30 flights.
As for the vent line, NEVER, NEVER, NEVER run a vent line without a Dons' Hobby Shop vent filter attached to the end of the vent tubing. Realizing of course, these filters are a bit big for tiny little fun flyers/etc, but for Giant Scale, they are perfect.
Even when I flew tiny little glow planes as a kid, I would always find a screen, or even use a regular in line filter (with larger mesh) on the vent line, so NO crap would suck up into my fuel tank.
The LAST thing I want in MY fuel tank, is trash and debris from my own shortcomings, which could have been prevented... It's all about a CLEAN fuel system... It's kind of neat to filter your fuel 4 times between the fuel jug and the engine, and STILL be able to unscrew an inline filter and find it all black and dirty....