Propane torch not lighting or staying lit? Fixing it can be pretty simple. You just need to follow two steps: 1. take off the burn tube if you can, and using a wire brush or q-tip clean the inside. You may need to just clean it from the top or bottom vents. You can also use compressed air to dislodge any debris or spiderwebs. 2. If your propane torch has an auto ignition, you may need to move the ignition wire closer to the outer wall until you see a spark when you click the torch lighter button

TJP Safety Training - Propane Torch Basics

How to Use a Propane Torch for Hard to Loosen Metal Pipes