If you have "rusty" fuel, I wouldn't run it in ANY pump. Maybe in a steam cleaner, torpedo heater, or as home heating fuel, but NOT in any engine. Rust is iron oxide, and VERY abrasive. If you can see it, the level is 1,000's times too much already. Particles can/will be sub-micron. Smaller than any consumer-available filter system can safely process. You'd need a centrifuge to clean it up to a suitable particulate level.