No gauge, no stick: tracking oil anyway
Some tanks cannot be read at all: the float gauge is fogged or stuck, the tank is sealed with no stick opening, or the buried fill pipe curves and the stick never finds bottom. You still have to know when to order, and you do not want to learn it from a sputtering burner. Four methods work without a reading off the tank, in the order we would try them.
1. Fix the access first
Cheapest first: a replacement float gauge is an inexpensive part swapped at a delivery or service visit, and a Petrometer style remote gauge can often be revived with a new aerator or a cleared line rather than replaced. If the obstacle is a curved fill pipe on a buried tank, ask your oil company to gauge the tank at the next delivery; drivers deal with stubborn fills weekly. Electronic monitors, float, ultrasonic, and pressure types, also exist as retrofits; your dealer can recommend one that suits the tank. Not every type fits every tank, and oil tank gauge types sorts them out by tank: above ground or buried, steel oval or sealed Roth.
2. Let automatic delivery watch it for you
This is the standard industry answer, and it requires nothing on the tank at all. Your oil company tracks the weather in degree days, knows your home's K-factor from past deliveries, and schedules the next fill before the math says you are low. The dealer carries the run-out risk instead of you. If your tank is unreadable, that is the best reason there is to be on automatic delivery.
3. Keep books on it
Your delivery slips already carry the numbers. Two of them in the usage calculator give your real gallons per day; from each fill, count down with the days-left calculator and reorder at the quarter-tank equivalent on the calendar. You are keeping books rather than measuring, so the answer carries a margin and holds only while the weather behaves. Leave that margin generous in January.
4. Put an hour meter on the burner
This is the precise method. An elapsed-time meter wired across the burner motor counts every minute of actual firing. Your nozzle's rated GPH and pump pressure give the true burn rate, and hours times rate equals gallons burned since the last fill. The burner fuel use calculator does the arithmetic and carries the nozzle flow chart.
Common questions
How accurate is the hour meter method?
Within a few percent once calibrated against a delivery ticket, which beats a float gauge by a wide margin. It drifts only when the nozzle wears or the pump pressure changes, so re-check the math after each annual tune-up, when the nozzle is replaced.
Who installs the hour meter?
Your service tech, ideally bundled into a tune-up. The meter itself is an inexpensive elapsed-time counter; wiring it across the burner motor is a few minutes of licensed work and is not a homeowner job.
My stick will not reach the bottom of the buried tank. Is the tank unreadable forever?
Not necessarily. A longer or jointed stick clears some risers, and a driver can often gauge the tank during a delivery. If the fill geometry defeats every stick, methods 2 and 4 on this page need no reading from the tank at all, and the delivery method can still identify its size.
Are the wifi tank monitors worth it?
Electronic monitors solve the same problem with hardware and an app, and they work. We keep no inventory and sell none. They cost real money, they need a compatible tank opening, and your dealer can tell you which style suits your tank. Everything on this page costs little or nothing.
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