TM-9-2320-280-20-1

TRUCK, UTILITY: M998 SERIES

TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3

JANUARY 1996

TM-9-2320-280-20-1 - Page 200 of 888

REFERENCE INFORMATION

If you hear a hissing noise while removing the

fuel filter cap then either the vent filter is plugged,

the vent line is restricted, or the vent valve is

restricted. The vent filter is located behind the

coolant surge tank.

Replace vent lines or vent line filter,

refer to (para. 3-27.)

Replace vent valve, refer to (para. 3-24.)

Diesel fuel is sensitive to temperature. All

diesel fuel has a certain amount of paraffin-like

components which have high energy value and

help improve fuel economy. When

temperatures are less than 20°F (-7°C) these

components begin turning into wax flakes that

can build upon the fuel tank strainer or in the

fuel filter. If wax build-up is found, replace the

fuel in the tank with a winter grade of fuel if

available. You will have to remove the fuel tank

if you need to inspect the tank strainer.

Replace fuel tank, refer to (para. 3-24.)

TM 9-2320-280-20-1

FUEL SYSTEM

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