Plastic clip is the retainer for accelerator linkage to the vacuum valve on the top of the injection pump that controls bleed vacuum to the transmission.
At some positions the rod will fall off without the retainer.
The 'cut off' canister is attached to the rear of the injection pump and has one vacuum line from the fire wall to it. It is actuated by vacuum applied to it when you turn off the ignition key. It pulls the rack to the 'no fuel' position.
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