The filter covers incorporate a threaded sleeve to accept the spin-on
filter cartridges. The word "Primary" is cast on the fuel strainer cover
and the word "Secondary" is cast on the fuel filter cover for identification.
No drain cocks are provided on the spin-on filters. Where water is a
problem, it is recommended that a water separator be installed.
Otherwise, residue may be drained by removing and inverting the filter.
Refill the filter with clean fuel oil before reinstalling it.
A 1" diameter twelve-point nut on the bottom of the filter is provided to
facilitate removal and installation.
Replace the filter as follows:
1. Unscrew the filter (or strainer) and discard it.
2. Fill a new filter replacement cartridge about two-thirds full with clean
fuel oil. Coat the seal gasket lightly with clean fuel oil.
3. Install the new filter assembly and tighten it to two-thirds of a turn
beyond gasket contact.
4. Start the engine and check for leaks.
Fig. 5 - Typical Spin-On Type Fuel Strainer Refill the fuel tank at the end of each day's operation to prevent
and Fuel Filter Mounting
CAUTION: A galvanized steel tank should never be used for fuel storage because the fuel oil
reacts chemically with the zinc coating to form powdery flakes which quickly clog the fuel strainer
and filter and damage the fuel pump and the fuel injectors.
Engine Out of Fuel
The problem in restarting the engine after it has run out of fuel stems from the fact that after the fuel is exhausted from
the fuel tank, fuel is then pumped from the primary fuel strainer and sometimes partially removed from the secondary
fuel filter before the fuel supply becomes insufficient to sustain engine firing. Consequently, these components must be
refilled with fuel and the fuel pipes rid of air in order for the system to provide adequate fuel for the injectors.
When an engine has run out of fuel, there is a definite procedure to follow for restarting the engine.
1. Fill the fuel tank with the recommended grade of fuel oil. If only partial filling of the tank is possible, add a minimum
of ten gallons (38 litres) of fuel.
2. Remove the fuel strainer shell and element from the strainer cover and fill the shell with fuel oil. Install the shell and
3. Remove and fill the fuel filter shell and element with fuel oil as in Step 2.
4. Start the engine. Check the filter and strainer for leaks.
NOTE: In some instances, it may be necessary to remove a valve rocker cover and loosen a
fuel pipe nut in order to bleed trapped air from the fuel system. Be sure the fuel pipe is
retightened securely before replacing the rocker cover.
Primer J 5956 may be used to prime the entire fuel system. Remove the filler plug in the fuel filter cover and install the
primer. Prime the system. Remove the primer and install the filler plug.