Gas Spill on an Asphalt Driveway: What to Do and Will It Damage It?

Yes, gasoline can damage asphalt. The binder that holds an asphalt driveway together is a petroleum product, and gasoline acts like a solvent on it. A small splash that evaporates quickly usually leaves only a stain. A larger spill that soaks in, or a slow leak that hits the same spot for days, can soften the surface so stones loosen and a pit forms. The fix is to act fast: keep flames and sparks away, soak up the fuel with an absorbent like clay cat litter, sweep it up, and dispose of it properly. Don't wash it down the driveway into the street.

Safety first: Gasoline vapor is highly flammable. If the spill is large, the fumes are strong, fuel is running toward a storm drain or into soil, or there's any chance of ignition, move people away and call your fire department's non-emergency line, or 911 if there's immediate danger.

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Why Gasoline Hurts Asphalt

Asphalt pavement is stone held together by asphalt binder, a thick, sticky part of crude oil. Gasoline, diesel, and some other fuels and solvents can dissolve or soften that binder. When the binder softens:

• The surface gets tacky or mushy
• Small stones lose their grip and come loose
• Over time, a shallow pit or raveled area forms

Gasoline evaporates fairly fast, which limits how much it can soak in. Diesel and oil evaporate slowly, so they can keep working on the surface longer. That's why a dripping diesel tank or a leaky lawn mower parked in one spot often does more damage than a single gas can tipped over.

What to Do Right Away

1. Stop the source. Stand the gas can up, shut off the equipment, or move the leaking vehicle if it's safe.
2. Remove ignition sources. No smoking, no running engines nearby, no power tools. Don't start the car that's parked in the puddle.
3. Keep people and pets back and let the area air out.
4. Contain it. If fuel is spreading, ring it with absorbent to keep it from running toward the street, a drain, or the lawn.
5. Absorb it. Cover the spill generously with clay cat litter, a commercial oil-dry product, sawdust, or absorbent pads. Work from the outside in.
6. Let it sit. Give the absorbent time to soak up the fuel.
7. Sweep it up with a broom and dustpan and put it in a sealable metal or approved container.
8. Dispose of it properly. Fuel-soaked absorbent shouldn't go in regular trash in many places. Call your local household hazardous waste program for instructions.

What Not to Do

• Don't hose it away. Water spreads the fuel and washes it into storm drains, which often lead straight to streams.
• Don't use a shop vac. Motors can ignite vapors.
• Don't try to burn it off. Ever.
• Don't pour detergent on a large, fresh spill before absorbing the fuel.

After the Fuel Is Gone: Clean the Residue

Once the spill has been absorbed and the area has aired out, you'll likely have a darker or shinier stain. Scrub it with warm water and a little dish soap or a driveway degreaser, then rinse with a small amount of water. Keep the rinse water off the lawn and away from drains.

How to Check for Damage

Wait a day or two, then look and feel:

• Surface feels normal and firm: You're probably fine. It's a stain at most.
• Tacky or soft spot: The binder was softened. Keep traffic off it and give it time to firm up as the fuel evaporates.
• Loose stones or a rough, pitted patch: The surface has raveled and needs a repair.

How to Repair Fuel Damage

Minor damage

Once it's fully dry and firm, clean the area, apply an oil-spot primer, and sealcoat it. The primer helps new sealer stick over any leftover residue.

Soft or pitted areas

Scrape out anything loose until you reach solid asphalt. Fill the low spot with cold patch in thin layers and compact it well. Let it cure, then prime and seal over it.

Large or deep damage

If a big area has softened or broken up, it may need to be cut out and patched with hot mix by a paving contractor.

How to Prevent Fuel Damage

• Fill mowers, generators, and gas cans on the lawn or gravel, not on the driveway, or put a drip tray under them.
• Use a spill mat under equipment that's stored on asphalt.
• Fix leaking vehicles and put a drip pan under them until you do.
• Keep your driveway sealed. A good coat of sealer gives you some extra time to clean up before fuel reaches the binder.
• Keep a bag of cat litter in the garage. It's cheap, and it's the fastest fix.

Bottom Line on a Gas Spill on an Asphalt Driveway

Gasoline softens asphalt, so speed matters. Keep sparks away, soak up the fuel with an absorbent, sweep it into a safe container, and dispose of it through the proper channels. Check the spot after a day or two, then prime and seal, or patch if the surface has broken down.