Mariner 90 - Acceleration Pump Fuel Flow Circuit for Four Cylinder Engines

3A-2790-13645--2 495 FUEL SYSTEM AND CARBURETION
Acceleration Pump Fuel Flow Circuit
for Four Cylinder Engines
NOTE: Fuel pressure values are approximate.
#1
CARB.
#2
CARB.
#3
CARB.
#4
CARB.
+4 .5 PSI
CYL. #3
CYL. #4
SMALL FUEL
FILTER
ACCELERATOR
PUMP
FUEL
PRESSURE
DROP OCCURS
+3 .5 PSI
BRASS RESTRICTOR
(.014” I.D.) LOCATED
INSIDE FUEL LINE
CHECK VALVES
LOCATED IN
CYLINDER BLOCK
TRANSFER PORTS
(UNSEAT AT 11–14 PSI
LARGE
FUEL
FILTER
+5 .0 PSI
–0 .4 PSI
–0 .5 PSI
+5 .0 PSI
FUEL
PUMP
FUEL
TANK
+4.0 PSI
FUEL
CONNECTORS