Thanks to all on my truck problem. Today I by passed the lock out and it fired up but still doesn't run so good. I clean the screen next. This truck had little or no maintenance done through the years. I have a hunch the vaporizer has never been cleaned. I still don't know why theres no power at the lock out , all relays are new , fuses are all good. Need to trace that.Question today is rebuild or replace vaporizer?If in fact cleaning doesn't fix it. #2 the lockout needs to hook to a run only source to prevent fuel from entering cyclinders yes? Thanks again for all your help. jo-c