FAA Looking Into Possible G100UL Fuel Issues

Russ Niles

Monday, January 20, 2025 at 11:51 PM ET

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Credit: General Aviation Modifications, Inc. (GAMI)

Key Takeaways:

The FAA is investigating multiple reports of aircraft damage, including peeling paint and mechanical issues, potentially linked to GAMI's G100UL unleaded fuel in California.
Incidents have been reported at Watsonville Airport, where inspectors examined affected planes, and the fuel is also sold at Reid-Hillview Airport.
GAMI is conducting its own materials testing in response to inquiries and is encouraging operators to report any suspected fuel-related incidents.
Over 100 aircraft across the affected areas are using G100UL under an approved Supplemental Type Certificate (STC).

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The FAA is now reportedly investigating reports of damage to aircraft related to their use of GAMI’s G100UL unleaded fuel in California. Inspectors looked at several planes involved at Watsonville Airport south of San Francisco. Various incidents of peeling paint, leaking fuel tanks and even a bent pushrod/seized valve have been reported in various forums.

GAMI is responding to inquiries and doing its own materials testing and is encouraging operators who believe the fuel is affecting their aircraft to report incidents. G100UL is being sold at Watsonville and Reid-Hillview Airport near San Jose. More than 100 airplanes at those fields and some from neighboring airports have the STC that allow them to use the unleaded gas.