[Logic_]

Show us your engine command or how you close the engine?

EDIT: Also,
https://sampwiki.blast.hk/wiki/SetVehicleParamsEx
since 0.3a you will have to reapply this function when OnVehicleStreamIn is called.

EDIT 2:
Optimized version of the code can be...

PHP код:

// top of the script
native IsValidVehicle(vehicleid);
// somewhere in the script
forward FuelTimer();
public FuelTimer()
{
    for(new vehid, veh = GetVehiclePoolSize(); vehid <= veh; vehid++)
    {
        if(IsValidVehicle(vehid))
        {
            new enginec, lightsc, alarmc, doorsc, bonnetc, bootc, objectivec;
            GetVehicleParamsEx(vehid, enginec, lightsc, alarmc, doorsc, bonnetc, bootc, objectivec);
            if(enginec)
            {
                if(Fuel[vehid] > 0)
                {
                    if(GetVehicleSpeed(vehid, 0) != 0)
                    {
                        FuelVar[vehid] ++;
                        if(FuelVar[vehid] >= 72/2)
                        {
                            FuelVar[vehid] = 0;
                            Fuel[vehid] --;
                        }
                        else if(FuelVar[vehid] >= 108/2)
                        {
                            FuelVar[vehid] = 0;
                            Fuel[vehid] --;
                        }
                    }
                }
            }
        }
    }
    return 1;
}