The Sierra 18-7817 is a comprehensive fuel pump diaphragm rebuild kit designed for Mercury, Mariner, Force, and Chrysler outboard engines. This complete kit provides all the essential components needed to restore proper fuel pump operation on 2-stroke outboards ranging from 30 HP to 275 HP.
Kit Contents:
- Fuel pump diaphragms (rubber and plastic)
- Base gasket (Sierra 18-0970)
- Check valves and springs
- Nylon push pin rivets
- All necessary hardware for complete rebuild
Key Features:
- Meets or exceeds OEM specifications
- Direct replacement for Mercury 21-857005A1
- Precision-engineered components for reliable performance
- Includes multiple diaphragm styles for universal compatibility
Replaces OEM Part Numbers: Mercury/Mariner 21-42990A1, 21-42990A2, 21-42990A3, 21-42990A4, 21-42990A5, 21-42990A6, 21-42990A7, 21-42990A8, 21-42990A9, 21-42990A10, 21-42990A11, 21-857005A1; Chrysler/Force 21-42990A7, 21-42990A8, 21-42990A10; GLM 40290
This kit is essential for addressing fuel delivery issues such as stumbling at high RPM, difficulty starting, or poor acceleration caused by worn diaphragms and gaskets.