Hi all,
From what I have gleaned I think I can say, in very general terms, fuel hose can be used for cooling systems but not cooling for fuel. But thank you to everyone for your comments which put me onto the right track.
Roger, yes the hoses are exactly as your piccie and I've just re-inspected them - not tacky. So it would seem a chemical change as they get warm. I haven't use additives, only Morris universal anti freeze. Whole wealth of info on tacky rubber on the Internet. (Including web sites of notoriety!)
I will play safe and replace. Bit of a bu---r really since one disappears to the back of the block (or head) and seems a bit fiddly
Regards for now
Geoff
70th Anniversary 4/4 Duratec
