My 2010 GSA wont start. It has been stood for about 4 months since last started and the battery was dead. Fitted a new battery and although turns over fine wont fire, always fired straight away before. Put more petrol in as the gauge was showing 2 bars. Still no joy and now showing low fuel. Is it the dreaded fuel strip?? It sounds like the fuel pump is priming when ignition turned on. HELP.....