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Don't know but my assumption is that those coloured tapes on the wiring loom are to identity the correct engine wiring loom to be fitted...

This shows the one on my engine The cap is at the bottom of this picture and you can also see the wire going up to the left

It is the cap that slides over an adjusting screw on the injection pump and is then wired on to act as an anti-tamper deterrent.

Perfect, many thanks for taking the time to reply. ...as an aside, any idea why the red amber green tape - happened to spot my bits of...

Found in my engine compartment today. Nothing obvious amiss. Boat: Glastron GS249 Engine: Volvo Penta AD31