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Stanadyne® FM100 Fuel System

Out with the old, in with the new. Donaldson filters for Stanadyne® Fuel Manager® FM100 fuel systems provide complete coverage with fewer part numbers. Buy one Donaldson replacement filter to fit multiple off-road applications. Our filters will accommodate your existing OEM drain valves, WIF sensors and bowls.


  • Stanadyne® Fuel Manager® FM100 Fuel Systems used in popular off-road applications


  • Save shelf space − consolidate part numbers stocked with complete application coverage
  • A single part number can fit up to 20 different applications, including both the current and previous fuel system designs 
  • 7 part numbers are available to cover over 500 vehicle applications


  • Versatile − no keys necessary for installation; universal interface allows one part to fit multiple applications
  • Integrated hose barb − allows attaching a hose to drain water to a container 
  • Fully compatible with OEM accessories such as water collection bowls, drain valves and wa.ter-in-fuel (WIF) sensors
Stanadyne® and Fuel Manager® are registered trademarks of Stanadyne Corporation.
This servicing information is provided as a best practices guide. It is not intended to replace or supersede the service instructions supplied by your engine or equipment manufacturer.

Stanadyne FM100 Fuel Filter Water Separator (FFWS)

  1. Disconnect Water-In-Fuel (WIF) sensor if present – reconnect after servicing.

  2. Unscrew the black retaining ring off the filter head and pull it down.

  3. After the ring has been completely removed, pull the filter straight down.
    Do not twist or turn the filter, as it is not threaded. Properly dispose of the used filter according to local regulations.

  4. Wipe filter head with a clean cloth.

  5. Apply a thin film of clean motor oil to the gasket.

  6. Push the new filter up to the filter head.

  7. Hand tighten the retaining ring until it clicks.

  8. Replace WIF sensor and water collection bowl gaskets if applicable.

  9. Prime fuel system per manufacturer instructions.

  10. Start engine and check for leaks.

  11. Drain water daily.

Donaldson Fuel Filter Servicing

 Donaldson provides best practices and recommended steps for fuel filter servicing. Effective fuel filter maintenance is the key to optimal engine performance.