Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 82Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 82

Quality of the image is intentionally reduced!

FUEL PUMP Remove screws and plate from pump cover to inspect check valve
4 Inspect check valve, gasket, and diaphragmReplace if damaged5 Replace plunger if tip is warn or groovedaCheck ValveDiap