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June 1, 2026 Service bulletin

Parts Bulletin for Fluorosilicone Fuel Tank Cap Seals

Western Star technical service bulletin PB-47-900-WST for 2018-2023 Western Star 4900, 2018-2022 Western Star 4700 and 2018-2022 Western Star 5700 and others.

Bulletin number
PB-47-900-WST
Component
Fuel/propulsion system
Summary
Parts Bulletin for Fluorosilicone Fuel Tank Cap Seals

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