For vehicles equipped with engineering machinery, pressing on the driving accelerator (almost) fully can cause the guide pin, which was installed specially for the vehicle equipped with machinery accelerator (installed on the throttle lever in order to prevent the throttle cable from slacking when the machinery accelerator is operated), to push the throttle cable, which may come to contact with the pipe of the fuel system. If this problem is left unattended, the pipe can be damaged, and in the worst case, fuel could leak resulting in a fire.