⭐ Best Diesel Fuel Stabilizers for Long‑Term Storage

For long‑term diesel storage, the most consistently top‑rated stabilizers are STA‑BIL Diesel Fuel Stabilizer and PRI‑D.
These products repeatedly appear in independent reviews for preventing oxidation, sludge, corrosion, and fuel breakdown during extended storage.

🔧 Top Options (with strengths)

  1. STA‑BIL Diesel Fuel Stabilizer
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  • Keeps diesel fresh up to 12–24 months depending on formulation.
  • Prevents sludge, corrosion, and injector deposits.
  • Widely available and easy to dose.
    Best for:
  • Backup generators
  • Farm equipment
  • Vehicles that sit for long periods
  • Home or commercial storage tanks
  1. PRI‑D (Power Research Inc.)
  • Frequently rated the best overall stabilizer for long‑term emergency storage.
  • Restores degraded fuel and extends storage life significantly.
  • Strong antioxidant package for ULSD.
    Best for:
  • Long‑term bulk storage
  • Emergency fuel reserves
  • Diesel that may sit for years
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  1. Star Tron Enzyme Diesel Stabilizer
  • Enzyme-based formula that helps prevent sludge and improves combustion.
  • Good for seasonal equipment and marine diesel.
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The Best Fuel Tank Cleaning Additive

STAR BRITE Star Tron Fuel Tank Cleaner – Remove Sludge, Varnish & Other Deposits – Rejuvanate Old, Stale Fuel – Concentrated Formula Works In Gas Tanks & Diesel Tanks – 64 OZ (093664)
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The Tank Dryer

Add this to mop water up! Simple and easy to use! The Tank Dryer is a fuel tank water absorber, which has been developed in response to the increasing concerns regarding water contamination of fuel.

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Get the water out of a small amount of fuel.
Mr. Funnel AF8CB Fuel Filter is the answer.

5.0 out of 5 stars Lifesaver
This thing is great. I had three gas cans tipped over during hurricane Ian, and they all became contaminated. I didn’t know what to do and then searching YouTube. I found this funnel. It worked great! I had no idea. I was worried about what I was going to do with all that contaminated gasoline and I couldn’t use my gas cans in the meantime. This was worth every penny.

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Portable Fuel Polishing

Basic Economy Fuel Polishing System for $479

  • 16 GPM 120 Volt Vane Pump
  • Hand Carry Handle
  • 5 Micron Filter
  • Filter Head with Pressure Gauge
  • Stainless Steel Fittings
  • Hose end suction strainer to protect the pump
  • 20 feet PVC Hose: To be cut by you to fit the job.

14 GPM Portable Diesel Filter System
Model FPSP14-12V. Under $2500

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Heavy Duty Portable Fuel Polishing

  • 420 GPH subject to distance from the source.
  • 115 volt motor with 7 GPM Pump.
  • Filter-less Purifier to removes over 99% of water and large contamination in fuel without filters.
  • Secondary absolute practical filtration to 10 microns standard.
    12 each filters included. Takes standard buy anywhere spin on filters.
  • Water/Debris alarm to indicate time to drain the purifier.
  • 2 each 20 foot suction and discharge hoses included.
  • Magnetic Fuel Conditioning.
  • Digital flow meter.

Stainless Steel Wall Mount Fuel Polishing

The FPS-400S is a modular tank cleaning and fuel polishing system designed for the transfer and/or re-circulating/ polishing of diesel fuel in storage tanks.

The base system utilizes a 7 gallon per minute continuous duty pump in conjunction with a Dieselcraft 5×24 purifier plus a 10 micron spin on filter.

Assembled with all Grade 8 fasteners on the 430 stainless steel backing plate and drip pan.

NOT FOR USE WITH GASOLINE

• Includes:

420 GPH subject to distance from the source.
• 115 volt motor with 7 GPM Pump.
• Filter-less Purifier to removes over 99% of water and large contamination in fuel without filters.
• Secondary absolute practical filtration to 10 microns standard.
10 each filters included. Takes standard buy anywhere spin on filters.
• Water/Debris alarm to indicate time to drain the purifier.
• Magnetic Fuel Conditioning.
• Digital flow meter.
• Flehtral GH-16 Hose
• Meets or exceeds the requirements of SAE 100R1AT and EN853
• DIN 20022 1SN-ISO 1436 Type 1.
• Tube: Synthetic Rubber
• Reinforcement: One braid of high tensile steel wire
• Cover: Blue Perforated, oil, abrasion and weather resistant synthetic rubber, MSHA approved
• Temperature: -40°F to 302°F, except for air 250°F max