1: Can anyone tell me what the thing is that is on the inlet manifold, on the right hand side at the front. Some sort of vacum valve I think. My braided hose to it seems a bit perished, so wondered what is does and how important it is.

2: My leak off/fuel return braided hoses are not very dry now. Should I replace them and is it easy to pull them off and replace?

Same hose for both I imagine.
Thanks
Mand