Can You Put Diesel in Your Home Heating Oil Tank?

Posted Sunday May 24, 2026

You've run out of heating oil on a cold night and you're wondering: can I put diesel in my oil tank to get heat until delivery? The short answer is yes, in an emergency — with important caveats. Here's what to know.

Diesel and Home Heating Oil Are Similar

Standard home heating oil (No. 2 heating oil) and on-road diesel are closely related fuels. In a pinch, diesel from a gas station will burn in most oil furnaces and can keep your heat running until your delivery arrives. It's a stopgap, not a habit.

Important Caveats

• It's expensive. Pump diesel costs much more per gallon than a heating-oil delivery, so only buy enough to bridge the gap (a few gallons).
• Use regular diesel, not the dyed/off-road kind from random sources, and never gasoline, kerosene mixes, or used oil — the wrong fuel can damage your system or be unsafe.
• If your tank ran completely dry, adding fuel may not be enough. Air in the lines usually means the system needs priming to restart.
• It won't restart a burner that's locked out — you may still need to hit the reset (see our no-heat checklist).

The Better Move: Same-Day Delivery

Pouring pump diesel is a last resort. The cheaper, cleaner fix is real heating oil — Oilex offers same-day and emergency delivery across Nassau County. Place an order and pick today's date, or call (516) 333-2703.

Avoid the Scramble Next Time

Running dry means stress, possible priming fees, and overpriced pump fuel. Set up automatic delivery so Oilex tops off your tank before it empties, and learn to read your tank gauge.