I have a ‘99 MXZ 670 HO and have no idea if the DPM system is working. What I am wondering is if the system is not working, can it damage the engine? From what I have read on the system, I believe the machine should just run a little rich and basically not get the fuel economy it could if it worked properly. I just did a top end overhaul since the machine blew a piston thanks to the previous owner, so I want to ensure that it is good to go from that, before I spend money in confirming the system is functioning properly. Thanks.