Does diesel fuel go bad like gasoline? - Diesel Forum -
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post #1 of 4 (permalink) Old 05-23-2008, 11:33 PM Thread Starter
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Does diesel fuel go bad like gasoline?

I have permanently parked my diesel. Does diesel fuel go bad after a long period of time. I know gas goes bad about 30 days. How about diesel?

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post #2 of 4 (permalink) Old 05-24-2008, 06:50 AM
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In the northeast many folks heat with oil. The oil sits in a 275 gallon tank and never empties - a perfect scenario for bacteria and water, yet it's rarely a problem. Heating oil and diesel is virtually the same product.

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post #3 of 4 (permalink) Old 05-24-2008, 11:56 AM
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Originally Posted by STUTTERSTAN View Post
I have permanently parked my diesel. Does diesel fuel go bad after a long period of time. I know gas goes bad about 30 days. How about diesel?
If you can keep water out you'll be ok. Its the water that will allow algae growth that's going to be your biggest problem. I'd fill it all the way up to seeing fuel in the filler neck if it were me. This will keep it from having an air space in the tank where condensation can form.


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post #4 of 4 (permalink) Old 05-26-2008, 12:52 AM
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The ULSD supposedly has a shelf life of about 2 months. We let the bus sit all winter long without treating the diesel tank, and it grew a phenomenal amount of algae. It was so bad that it would plug a filter after only 10 or so miles. The stuff I drained out looked like green apple cider. Right now we've dropped the tank to steam clean it, and are putting new fuel lines on. If you're going to let it sit, put some kind of biocide in it.

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