For a complete understanding of fuel systems and fuel pump operation for the Mercury Mariner 40 hp 45 hp 50hp 1995, 1996, 1997, 1998, 1999 2000 outboard motor. follow the link above for a complete factory service repair manual guide available for instant download in pdf format. High quality picture illistrations, diagrams and step-by-step procedure to get the job done right. A must have manual for any repair job.
FUEL SYSTEM
Fuel Pump
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A-1
Fuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A-2
Fuel Pump Operation . . . . . . . . . . . . . . . . . . . . . . 3A-4
Fuel Pump Removal . . . . . . . . . . . . . . . . . . . . . . . 3A-5
Fuel Pump Disassembly . . . . . . . . . . . . . . . . . . . 3A-6
Cleaning/Inspection/Repair . . . . . . . . . . . . . . . . . 3A-7
Fuel Pump Reassembly . . . . . . . . . . . . . . . . . . . . 3A-8
Fuel Pump Installation
FUEL SYSTEM
Fuel Pump Type
Fuel Pump:
Pressure
Diaphragm Stroke
Plunger Stroke
Fuel Tank Capacity
Pump Operation
1. The fuel pump is a diaphragm pump which is mechanically driven off of the rocker arm.
2. The black mounting block (insulator) and the two outlets on the fuel pump help prevent
vapor lock.
3. If the engine runs out of fuel, or has a restriction preventing adequate fuel flow, the pump
will make a “clicking” noise.
1. Remove sta-straps from fuel lines.
IMPORTANT: The hose fittings on the fuel pump can break if you try twisting or pulling
the hoses off. Remove hoses by slowly prying off the hoses using a small screwdriver.
2. Disconnect fuel lines from pump.
3. Separate fuel pump from cylinder head cover by removing mounting bolts.
