C 30 P/U 2WD V8-379 6.2L DSL (1985)
Figure 2 - Lower Filter Element
6.
Visually inspect the bore(s) for evidence of seal particles. If particles are present, compressed air can be blown into the lower
filter element locating tube to remove small particles in the bore(s) (Figure 2).
7.
A short length of 1/4 inch diameter bar stock or equivalent with square ends can be used to install the new seals in the base.
Apply a small amount of Synkut lubricant (or equivalent, such as STP) to the end of the rod. Attach a new seal (P/N 15529641)
to the rod's end. Insert the seal into the air vent plug bore until it seats firmly in the bottom of the bore. Visually inspect inside
the bore to ensure that the seal is squarely bottomed. Install the air vent plug.
The seal can be installed with special tool #27751, available from Stanadyne Diesel Systems.
8.
Repeat the above procedure to install a new seal in the drain plug bore, but do not install the drain plug.
Figure 2 - Lower Filter Element
9.
Measure the length of the drain plug bore boss as shown in Figure 2. If the boss is 1/4 inch long, install the drain plug and
tighten until it bottoms. If the boss is 1/8 inch long, install plain washer (P/N 561890) on the drain plug and then thread the plug
in until it bottoms. The drain plug washer prevents threading the drain plug in too far and damaging the seal.
10.
Attach the element to the base.
11.
The filter assembly and plug seals can be pressure checked with air by plugging the fuel inlet, outlet, and drain outlet (if
applicable). Using a maximum of 10 psi air pressure, open and close the air vent and drain plug (if equipped) several times to
ensure that the plug(s) are sealing.
12.
Reinstall filter assembly on vehicle and attach all fuel hoses and electrical connections.
13.
Vent and prime the fuel system as outlined in the Service Manual or Owner's and Driver's manual.
14.
Check for leaks.
