Hi does anyone have an idea of how to rectify my problem, when i turn my ignition off the engine still runs for a few seconds before stopping this has just happened in the last few days, there are no problems with the engine as it runs fine however i do run it on biodiesel but have not had this problem in the past, A friend seems to think it is more of an electrical problem either relay or solenoid i would be grateful for any help thanks in advance Nick