Back to the main question about the fuel filter. RUN YOUR TRUCK WITH ONE! The reason is because I hadn't been running one in my truck and I went to prime the engine one day. The fuel came up, but went down right away. I took it into the hobby shop and they cleared out the carb and it was fine. (sprayed it with nitro cleaner) The point is, by not running a fuel filter, you can get stuff clogged in the carb. NOw, I'm always gonna run a fuel filter. Hope this helps and good luck!