You do not have to have a propane tank for very long before running into a question or two about how it works.
One of the most common questions typically happens right after a delivery.
You just had the tank filled, so naturally, you expect to see a full tank when you check the gauge afterward. Then you look at the gauge and notice it only reads around 80%.
At first glance, it can feel like something is wrong. Was the delivery completed? Was the tank only partially filled? Did the gauge stop working correctly?
The good news is that a tank reading like this after a propane delivery is usually exactly what you should expect to see. For safety’s sake, propane tanks should always have some empty space inside and not be filled to the top.
And while the explanation seems straightforward, understanding a few basics about how propane tanks are filled, what affects delivery amounts, and what is considered normal after a refill can help you feel much more confident the next time you check the gauge.
Propane is not like gasoline. When gasoline sits in a vehicle’s fuel tank, it changes very little. Propane, on the other hand, naturally expands and contracts as temperatures rise and fall throughout the year.
With some space left in your tank, your propane has room to expand safely as outdoor temperatures rise. Without that extra space, pressure inside the tank could rise to levels the system was never intended to manage.
In other words, that “missing” 20% is not missing at all. It is an important part of how a propane tank works safely and properly in changing weather conditions. We call this the 80/20 rule.
Another thing that sometimes catches homeowners off guard is the number of gallons listed on the delivery ticket.
It is easy to assume a propane delivery always means filling an almost-empty tank. But that is not necessarily the case.
If the tank still has propane, the delivery driver would only add enough fuel to bring it back to its proper level. The amount delivered will depend on how much propane was already in the tank before the truck arrived.
That is one reason delivery amounts can vary significantly throughout the year. A homeowner might receive a large delivery after a cold winter stretch and a smaller one during a milder period, even though the tank is being filled both times correctly.
Understanding that difference can help make more sense of both the tank gauge and the delivery receipt after a propane delivery.
Once you understand why a tank reads around 80% after a fill-up, you can move on to becoming more familiar with how propane is used in the home. Knowing what is normal for your household, how quickly fuel is typically used during different times of the year, and when it may be time for another delivery can go a long way toward avoiding unnecessary worry.
If questions ever do come up, it helps to have a local propane provider you can call for answers and responsive service. For more than 70 years, Roach Energy has been helping homeowners and businesses throughout the Eastern Panhandle and eastern West Virginia navigate their fuel needs with dependable propane delivery and knowledgeable service.
By relying on Roach Energy for your heating fuel services, you support a local, family-owned company. That helps keep more of your money in the community, supporting local workers and local businesses, instead of sending that money to corporations with headquarters located far away.
