Fuel Pump Switch times

Hi all.In FSX I want switch a fuel pump on with(A:GENERAL ENG FUEL PUMP ON:1, bool) ! if{ (>K:TOGGLE_ELECT_FUEL_PUMP1) } The 'A' variable is a switch to stop the fuel pump from continuously toggle on and off. However, the pump does toggle continuously. It's like the 'A' variable is not setting. So I'm thinking that there is not enough time for the pump to react and reset the 'A' variable.I introduced to slow things up a bit, and hey presto, the code now behaves itself and the pump just toggles once to 'on'.Does anyone have any learned comments?Should the Update be slowed down in general to give things a chance to work?cheers,nick