Fuel system - annual or 100-hour inspections

               Note: compliance through extra off job sheet along with 100hr schedule
• Check fuel caps, cap gaskets, cap adaptors, cap adaptor gaskets, fuel filler neck to adaptor sealer, fuel gage transmitter gaskets, gage transmitter access covers, and upper surface inspection covers for condition, proper sealing, security, alignment, etc. Ensure to service and clean these areas, replacing parts as necessary.
• Drain and flush the fuel strainer and carburetor bowl completely.
• Inspect the interior of metal fuel tanks for signs of corrosion, which may indicate water contamination.
• Inspect the interior of bladder tanks for wrinkles, broken or missing hangers, etc.
• If signs of contamination are found, alert the owner and fuel supplier of your findings for corrective action.
5. If aircraft has a fuel drain valve replaced with a cap or plug, you should suspect water contamination in the respective tank. Strongly consider having a qualified maintenance technician install the proper drain valve prior to flight
6. Take precautions to preclude water migration in the fuel tank system from an internal source (free water coming out of solution). Keep fuel tanks full when the airplane will not be operated regularly to minimize moisture condensation within the tanks. Keep fuel tanks full between flights, provided weight and balance limitations permit. Limit the fuel tanks exposure to large temperature fluctuations as much as possible. If the airplane has been exposed to sustained wing low or unusual attitudes or a fuel tank has been run dry, sump contaminants may have migrated throughout the fuel tank system.
7. Know your fuel supplier. Regularly check and verify quality controls are in place to ensure you receive only dry, uncontaminated fuel from a supplier. Have on-field checks and verify to ensure continued supply of dry uncontaminated fuel to an operator. Gain assurance that the fuel supply has been checked for contamination
and is properly filtered before allowing the airplane to be serviced. When ordering fuel, specifically state the exact fuel grade and quantity needed. Be present at each and every refueling and observe the fueling process.
8. Collect all sampled fuel in a safe container and dispose of properly.
9. Replace all safety items removed during contamination checks. Correct all unsatisfactory conditions found during or any examination prior to further flight.
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