The fuel selector valve works in unscreened fuel. Contaminated fuel can cause selector valve seal damage. When fueling from possibly contaminated fuel sources McFarlane recommends the use of a fuel filter, such as Mr. Funnel or another filtering device, to reduce trash in the fuel system.
APS Primer Lines
FAA-PMA approved for various Lycoming engines
Prevent vibration cracking and fuel leakage on the engine!
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