Bill, the coupler is super easy- remove the shell, then remove the pilot. Next, turn the engine upside down. Remove the c-ring for the coupler with pliers, be careful with the spring popping- hold it securely. The coupler comes off the truck assembly. You'll need to follow the plug to the harness and unplug it. It comes out at that point, pigtail and connectors. Just follow the leads to unplug.
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