Aagaz one issueI forgot to mention learned t b is from an old timer. I use a soup can painted black inside. Have a small hole that fits our glow plugs. The spring on most plugs has a covering. That makes them glow bright red. In that can a plug is dull not bright red the plug will not fire the fuel mixture. Most plugs have three ranges of heat and brightness. Dull medium and bright. Always use a bright range on UC engines. Some plugs have idle bars. Never use idle bars on a glow UC engine. Thought I would share! Keep them lines tite.AJ