Ford F-650 2001 Owner's Manual page 189

Installation
The engine will not run properly if the fuel filter is not installed
in housing.
1. Apply a coating of clean diesel fuel to the new bevel gasket and install
it onto the fuel filter housing.
2. Install the new fuel filter element onto the cap. Place the new fuel
filter element and cap into the fuel filter housing. Allow fuel to soak into
the fuel filter element.
3. Tighten cap onto the fuel filter housing until cap contacts the housing.
4. Start the engine and check for fuel leaks.
After changing the fuel filter, the engine will purge the trapped air as it
runs. Engine may run roughly and smoke until the air is completely
eliminated.
Fuel filter replacement—Cummins B engine
Refer to your engine operator's manual for service intervals and
procedures.
ESSENTIALS OF GOOD FUEL ECONOMY
Measuring techniques
Your best source of information about actual fuel economy is you, the
driver. You must gather information as accurately and consistently as
possible. Fuel expense, frequency of fillups or fuel gauge readings are NOT
accurate as a measure of fuel economy. We do not recommend taking fuel
economy measurements during the first 1 600 km (1 000 miles) of driving
(engine break-in period). You will get a more accurate measurement after
3 000 km–5 000 km (2 000 miles-3 000 miles).
The advertised fuel capacity of the fuel tank(s) on your vehicle is equal
to the rated refill capacity of the fuel tank(s) as listed in Fuel Tank
Capacities in the Capacities and Specifications chapter. The
advertised capacity is the amount of the Indicated Capacity and the
Empty Reserve combined. Indicated Capacity is the difference in the
amount of fuel in a full tank and a tank when the fuel gauge indicates
empty. Empty Reserve is the small amount of usable fuel remaining in
the fuel tank after the fuel gauge indicates empty.
Maintenance and care
189