Might sound like a weird question but how do I know if the oil injection system is working on my Mercury XR150? The injection system was unplugged when I purchased the boat and I've simply been adding oil to the fuel. I was told by the previous owner that the beacon that sounds when there's a failure in the oil injection system has been destroyed (he got tired of hearing it). There is an oil resevoir under the cab of the engine as well as a bigger one on the boat itself. All appropriate hoses seem to be hooked up right but how can I know for sure if it's working right? Any advice would be appreciated. Thanks.