Mariner 100, Service Manual, Page: 90 / 391

3A-3 90-13645--2 495 FUEL SYSTEM AND CARBURETION
Fuel Pump Removal/Installation
(Design 1)
Remove 4 hoses from fuel pump.
Remove 2 phillips-head screws -- lift off fuel pump.
Remove 2 hex-head bolts to disassemble fuel
pump.
20427
a
b
a
c
a - Fuel Pump
b - Screws (2 Each)
c - Bolts (2 Each)
Remove gasket from backside (fuel pump base) --
replace gasket as necessary -- check gasket in
port area carefully.
20417
a
b
a - Gasket
b - Port Area
Reinstall Fuel Pump (Design 1)
After reinstalling fuel pump, ALWAYS check all
fuel line connections for leaks, with engine
running.
CAUTION
Reinstall fuel pump to powerhead, as shown, with
2 phillips-head screws.
Attach fuel lines (inlet and outlet).
Attach oil injection hose.
Attach pulse hose.
Secure each hose connection with a sta-strap.
a
b
c
d
a - Inlet Fuel Hose
b - Outlet Fuel Hose
c - Oil Injection Hose
d - Pulse Hose
Fuel Pump Cleaning,
Inspection, Disassembly and
Reassembly (Design 1 and 2)
Disassemble by removing 2 hex-head bolts;
remove/disassemble fuel pump parts.
Fuel Pump – Cleaning/Inspection
Clean fuel pump housing, check valves, pulse cham-
ber, and pump base in solvent, and dry all but check
valves with compressed air.
Inspect each check valve (2 ea.), for cracks and/or
holes. Check each black rubber disc (2 ea.) to see
that the black coating is not coming off. Unless dam-
aged while disassembled, replacement is seldom
necessary. Inspect the Check Valve Assembly on
Chamber Plate (check by both pressure and suction
to hose barb), to see that check ball is moving and
functioning (1-3 psi required).
Inspect fittings on fuel pump housing for looseness or
any signs of fuel or air leaks. Replace or tighten fitting
if leak is found, or replace chamber Plate Assembly.