Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Preventive Maintenance
NOTE: To expel air from density-type strainer
elements, soak them in clean fuel before installing
them.
• Throw away old gaskets. Replace them with new ones to
ensure a positive seal.
• Position the shell and gasket properly. Then tighten the
cover nut or bolt just enough to prevent fuel leakage.
• After starting the engine, check for leaks around the filter.
Filter Draining
Check fuel filter/water separator daily. Check with engine
OFF. Depending on the fuel storage facility, more frequent
draining may be required.
1. Open drain valve (by hand only): turn valve screw
counter-clockwise approximately 1 1/2 to 2 turns until
draining occurs. Drain filter sump of water until clear fuel
is visible.
If entrapped water exceeds sump volume, you can
either:
Engine Maintenance
A. Close valve and run engine until smooth idle is
established, then repeat drain procedures, or
B. Remove filter from mounting head, completely drain
all fluid, and reassemble filter assembly. Be sure to
follow new filter assembly instructions.
2. Close drain valve by turning valve screw clockwise
approximately 1 1/2 to 2 turns.
Fuel Tanks
CAUTION: Do not overtighten the valve. Overtightening
can damage the threads.
1. Inspect fuel tanks, fuel hoses, and fittings to ensure
proper positioning and fastening; check for leaks.
2. Inspect mounting brackets, straps, and pins to ensure
proper positioning & fastening every 15,000 miles/
24,000 km (see label on fuel tank and data below):
Type of Tank
Aluminum
Tank Strap T-Bolt Nut Torque
30 Lb. ft. (41 Nm)
Cylindrical Steel 8 Lb. ft. (11 Nm)
Medium Duty (R10/06) Y53-6008 – 141 –