IDENTIFICATION OF FUEL SUPPLY PUMPS
All 6081 Engines are equipped with a mechanical fuel
supply pump mounted on the outside of the injection
pump (Bosch or Nippondenso).
A tappet on the final supply pump is actuated by the
injection pump rotating cam during engine revolution. The
tappet on the supply pump may be either a flat plunger
type (Bosch) or a roller tappet type (Nippondenso). (The
Nippondenso pump is an option on 6081T engines only.)
Fuel supply pumps are furnished as complete assemblies
for repair. Only the primer, washers, and fittings are
available as separate parts.
REMOVE FUEL SUPPLY PUMP
NOTE: To diagnose fuel supply pump malfunctions, refer
to Group 115 of CTM134.
Thoroughly clean exterior of supply pump. Also clean
around supply pump mounting area on injection pump
1. Disconnect fuel inlet line and outlet line, shown
do not enter fuel system.
Removing Fuel Supply Pump
2. Remove three supply pump mounting nuts and pull fuel
supply pump straight out from mounting studs as
3. Cover supply pump mounting bore so debris cannot
enter injection pump housing.