TM 9-2320-260-34-1
F U E L SYSTEM MAINTENANCE
Description and Data (page 5-1)
Section I.
Section II. Fuel Injector Maintenance (page 5-3)
Section III. Fuel Pump Maintenance (page 5-37)
Section I. DESCRIPTION AND DATA
5-1. FUEL SYSTEM MAINTENANCE INDEX
PARA.
PAGE
TITLE
NO.
NO.
Description
Data
Fuel Tank Repair
5-2. DESCRIPTION
The M809 series vehicles use standard or variable speed pressure time (PT) air fuel controlled (AFC)
plugged, type G fuel pumps. The variable speed (VS) fuel pump is used on the M816 and M819 models.
These models require greater varying engine speed to operate the crane. This is accomplished by an
additional governor located in the upper portion of the fuel pump housing.
All engines used in the M809 series vehicles contain six pressure time (PT) type D fuel injectors. The
injectors receive fuel from the fuel pump and meter, and inject fuel into the combustion chamber. There are
two types of injectors being used in these models: a standard cylindrical PT (type-D) and cylindrical PT
(type-D) top stop injector. The standard injector was used prior to serial number 11246663, and after serial
number 11246663 the top stop injector was used.
