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Priming the C18 Engine when the engine has been run out of fuel.
Note: Additional steps must be taken to prime the engine when the engine has ceased to run due to an
exhausted fuel supply.
Fill the fuel tank with clean diesel fuel of the appropriate grade.
Open the air purge screw (2) three full turns. Do not remove screw.
Crank the engine for 30 seconds. Then allow the starter to rest for 2 minutes. Use a suitable container to catch
fuel flow from the air purge screw bore. You may use the hand priming pump (1), in lieu of starting the engine.
See Figure #4-2.
Crank the engine for 30 seconds. Allow the starter to cool for 2 minutes.
Repeat step 4 until the engine starts and runs.
Clean any residual fuel from all engine components.
Changing the Fuel Filters
Each engine has two fuel filters. For identity, the primary filter incorporates the transparent water separator.
Both primary and secondary filters must be replaced at the same time.
Replacing Primary Fuel Filter / Water Separator
Close fuel shut-off valve at bottom of fuel tank, if equipped.
Thoroughly clean filter base (4) and surrounding area to keep from getting dirt and debris into fuel system. See
Figure#4-4.
Remove element (1) from the mounting base while bowl (2) is still attached.
Dispose of the filter contents appropriately. Remove bowl (2) from element (1). The bowl is reusable, do not
discard. Dispose of the used element.
Remove the o-ring from the gland of the bowl. Clean the bowl and the o-ring. Inspect the o-ring for damage or
deterioration. Replace if necessary.
Lubricate the o-ring with clean diesel fuel.
Install bowl (2) on a new element. Tighten the bowl by hand. Do not use tools to tighten the bowl.
Lubricate the top seal of the element (1) with clean diesel fuel. Install the new element on the filter base.
Tighten the element by hand.
Ensure the drain (3) is in the closed position.
Open the fuel shut-off valve at the bottom of the fuel tank, if equipped.
Start the engine and check for leaks. Run the engine for 1 minute. Stop the engine and check for leaks
again.
The primary filter/water separator is under suction. A leak will allow air to enter the fuel. Aerated fuel
can cause loss of power.
Replacing Secondary Fuel Element
Stop the engine. Close fuel shut-off valve at bottom of fuel tank, if equipped. Disconnect battery power.
It may be necessary to relieve residual fuel pressure from the fuel system before the fuel filter is removed. Wait
1 to 5 minutes until the fuel pressure is lowered. Use a suitable container to catch any fuel that may spill.
Remove and discard the used filter.
Apply clean diesel fuel to the new filter o-rings.
Install the new fuel filters. Spin the fuel filter onto the filter base until the o-ring makes contact. Use the rotation
index marks on the filters as a guide for proper tightening. Tighten filters according to the instructions that are
on the fuel filters. Do not overtighten the filters.
Open the fuel supply valve. The engine will need to be purged of air. Refer to Section 3.1.2.1 for fuel system
priming instructions.
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