If you’re the proud new owner of a propane gas tank, you may be wondering what to do when the gas runs out and the tank goes bad. You’ve come to the right place for answers, thanks to the internet. We’ve included a checklist of when to service and replace your propane tank, as well as some helpful tips on how to prolong its life. When to service propane tanks the most important thing to remember about them is that they should never be left completely empty. Doing so could damage them. There are two ways to avoid this, fortunately. To see how much fuel is left, there is also a wireless tank monitoring system. The other option is to sign up for automatic deliveries. When a company schedules regular visits to top off your tank for you, it is when you need to replenish your tank. If this is a service you’re looking for, our company operates as a propane fuel delivery company when we’re not putting in new tanks. Check out our rates and all of the services we offer as part of the program. When to replace despite the fact that propane does not have an expiration date, the tanks do. They last about 30 years, but it could take longer.