Detroit Diesel DD15 EuroIV Operator's Manual page 84

How to Procedures
WARNING: PERSONAL INJURY
To prevent the escape of high pressure fuel that can penetrate
skin, ensure the engine has been shut down for a minimum of 10
minutes before servicing any component within the high pressure
circuit. Residual high fuel pressure may be present within the
circuit.
NOTICE: At cold temperatures (-40° C or -40° F), DO NOT remove the filter
elements from the caps unless the intent is to replace the filter elements.
Repeated removals at cold temperatures may break the filter element tabs.
Removal of the Fuel Prefilter
Remove the prefilter as follows:
1. Using a 36 mm socket, unscrew the prefilter cap.
2. Pull the cap and prefilter straight up and out of the fuel filter housing.
3. Remove the prefilter (1) from the prefilter cap (2) by placing the filter on a
solid surface and apply pressure on prefilter cap (2) at an angle.
4. Discard the prefilter cap seal ring.
Installation of the Fuel Prefilter
Install the fuel prefilter as follows:
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