Diesel fuel starts to degrade and become contaminated within 28 days of storage. Typically, fuel can be stored 6–12 months, but without proper care, its quality will decline.

To maximize storage life, many companies recommend:

• Keep fuel cool, ideally around 70°F
• Treat with biocides and stabilizers
• Maintain tanks per NFPA 110 standards

According to NFPA 110, diesel “Storage Life” is 1.5 to 2 years. Tanks should be sized so fuel is consumed within that period, or stale fuel must be replaced.

The Most Critical Step: Keep Water Out

Water is the number one killer of stored diesel fuel. It encourages microbial growth, leading to bacteria, sludge, and engine damage.

• No water = no bacteria
• No bacteria = no need for biocides

Regular fuel polishing is the most effective way to remove water, sediment, and microbes—but it can be expensive.

Deciding on Fuel Management

Consider your fuel volume:

• 200 gallons vs 5,000 gallons – costs and methods vary.
• Decide if contracting a fuel polishing service or investing in a machine makes the most sense for your operation.

Meanwhile, for small tanks, simple devices can quickly remove water and prevent early contamination.

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