Will pull the inner panel off and have a look and a clean as the fuel gauge still only ever shows half full so may be a fair bit if grot on the connectors just like the rest if the electrical stuff. All I have been able to smell for the last few days is fuel so I imagine I will have to get in there with some degreaser or similar and give it a clean to. Will change any fuel lines out that are a bit average as well. Thanks for the tip.