Can I stabilize gas that has been sitting for a year?[SOLVED]

Will Sea Foam stabilize ethanol gasoline that has been sitting in the gas tank for a full year? The car is a 2007 Mustang that hasn’t been driven for a year.

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Jim D.
Jim D.
3 years ago

Thanks for the question Victoria. When using a fuel stabilizer like Sea Foam, it works best when added to fresh fuel. Adding to year-old fuel means the fuel has had 12 months to degrade, so nothing can restore the gasoline to new. My encouragement is to come up with a plan to get rid of the gas in the Mustang. What I would do:  If the car has to sit, I would siphon the tank gas into storage cans, then burn the older gas in a vehicle driven regularly. The old gas will work fine if mixed with new gas.

Tina M Ramirez
Tina M Ramirez
1 year ago

I purchased a 2006 Hyundai Accent that was not driven in years. Replaced several things but still feels shaky. Would this product help?

Conner Kranz
Conner Kranz
1 year ago
Reply to  Tina M Ramirez

Hi Tina,

There may be a few different things happening with your Hyundai so it’s hard to say what’s causing the shaking, but know this: Sea Foam will help overcome problems related to gum/varnish in the fuel system, which is a likely issue in a vehicle that has been around that long.

Here’s what I’d try: add a full can of Sea Foam High Mileage to your fuel when you’re at 1/4 tank or less. Then drive at least 20 miles (just don’t run out of fuel!) before refilling. See if that makes a difference in how it accelerates, how smooth it is when idling, and general engine performance. The Sea Foam will clean any gum/varnish, helping the engine run smoother and better.

In addition, you could apply a can of Sea Foam Spray through the intake, which will clean areas that a fuel additive can’t reach and help overcome some of the same performance problems. Instructions here: <a href=””></a&gt;

Bottom line: we get a lot of positive feedback from customers who use Sea Foam in older/little-used vehicles like that, and they are very pleased with how it works. Let us know what happens if you try it!