XUD9TE with lucas pump (306DTS)

Hello everyone,

Can anyone tell me what the arrowed item does on this lucas fuel pump:
http://homepage.ntlworld.com/chrismi/tmp/lucaspump1-sml.jpg (83k)
It's connected to the fast idle arm with inturn is connected to the
thermostat. I've looked in my Haynes manual, but there is no mention of this
part of the pump. As you can see, the rubber has perished and I was
wondering what it did and how quickly I should do something about it.

Also, I take it that the larger item on the front of the pump (with the two
cable ties around it) is the stop solenoid?

Cheers,

Chris

 

just a damper coat it with grease to keep it clean and working