What Happens When You Run Out of Propane (And How to Make Sure You Don’t)

Running out of propane happens more than you’d think. You have a gauge. Maybe it’s the dead of winter. Maybe it’s the middle of summer and you thought you had more time. Life happens, and usually on a weekend, usually during a cold snap, and always at the worst possible moment, you run out of gas.

Here’s what actually happens when a tank runs empty, why it’s more complicated than just a refill, and how to make sure it doesn’t happen to you:

Not Just An Empty Tank

When a propane system runs completely dry, the process of getting back online is more involved than a standard delivery. Completely running out of propane means a required safety inspection before service can resume, turning what should be a routine fill into a longer appointment with a larger bill.

Here’s what happens: the tank is refilled, but before your appliances can be restarted, a technician has to perform a leak check on the entire system. This is required because when a system runs to empty, air and moisture can enter the lines. A technician checks every connection, valve, and appliance before relighting pilots and restoring service. Depending on scheduling and weather, this can mean hours without heat.

It also typically costs more than a standard delivery. Emergency service fees, after-hours rates, and the leak check itself add up.

Understand Your Gauge Reading

The dial gauge on your tank is your first line of defense, and it has a few quirks worth knowing:

• A 30% reading is the recommended threshold to call for a delivery because it gives enough cushion for the delivery to arrive before you hit empty.
• The gauge reads the percentage of capacity, not gallons. A 500-gallon tank at 20% has 100 gallons left. A 250-gallon tank at 20% has 50. Know your tank size.
• Gauge readings can shift a few percentage points with temperature changes. A tank that read 25% on a warm afternoon might read 22% the next cold morning with no usage.
• The dial gauge is accurate to roughly plus or minus 10%, so treat a reading near 20% as a call-now situation, not a wait-and-see one.

Get The Most For Your Fill During Missouri Winters

EIA data projected residential propane prices rising from around $2.13 per gallon in October to $2.58 per gallon by March 2026, which is a 21% increase over the heating season. That’s not unusual. Retail propane prices tend to climb through peak demand months regardless of what wholesale prices are doing. 

Calling for a fill in November costs less per gallon than calling in February.

This is how Brooks Gas’ pre-buy program saves you money: you lock in your price before winter, take delivery on your schedule, and the February spike doesn’t affect you. Let us help you use the math of propane pricing to work in your favor when you plan ahead.

What to do if you do run out

If it happens, here’s the sequence:

1. Call Brooks Gas immediately, don’t wait and hope it resolves itself.
2. Do not attempt to relight pilots or restart appliances yourself after a complete runout. Wait for the technician.
3. If you have alternative heat sources (electric space heaters, etc.), use them while you wait, safely, and not in enclosed spaces.

Once the technician arrives, they’ll refill the tank, perform the required leak check, and restore service appliance by appliance. Plan for an hour from the time they arrive, depending on the number of appliances and any issues found – normal safety checks take around 30 minutes.

The easier solution: don’t get there

Check your gauge every week during heating season. Set a phone reminder if it helps. Call when you hit 30%, not when you hit 10%. And if you’d rather not think about it at all, ask us about automatic delivery, we track your usage and schedule fills before you need them.

Questions? We’re here.

• Marshfield: 417.468.2549
• Conway: 417.589.8961
• Seymour: 417.935.4100
• 24/7 Emergencies: 417.468.5668

Sources

• EIA Winter Fuels Outlook 2025–2026 — retail propane price projections
• Propane Education & Research Council (PERC) — runout and safety inspection requirements
• propane101.com — tank gauge accuracy reference
• crystalflash.com — delivery management and runout guidance