I have a 1994 BMW 318is, It will not start. It will Turnover like it wants to start, But will not. It has been sitting for three months, when I parked it there was no problem. It sounds like the fuel pump is constantly running with the ignition off, and it sounds like there is an air escaping noise from the engine compartment. The battery is good; had it tested. Put Fuel in it. Please Help me diagnose this issue.