I stopped the engine by opening the fuel filter line and letting air into the system. I took 5 primes to get her started again. According to the Yanmar document I need to crack the injectors to stop her next time. I may have a bad relay. I'll find out today when I try to stop the engine all the same, I have the 17mm wrench ready to crack the injectors. Nice day today, went shopping and picked up everything for Crawfish Etoufee. Yum… Can't wait.