Thanks for your reply.
No the fuel pumps are not noisy at this point in time.
Along side my idle problem the car has shut of a few times within the last month. This happens at a stop light etc. The car starts up right away each time. I am trying to link this problem to my ever niggling rough idle problem and the fuel pumps along with the over voltage relay have been mentioned.
I am looking for alternate oppinions before I go ahead and sink another 1k only to find that the rough idle / shutoff problem is still there.
Thanks for your help.
88 300 CE
82 300 SD