
- State-of-the-art cleaning technology for thorough results
- Experienced technicians trained in safety and compliance
- Flexible scheduling to minimize disruption to your operations
- Comprehensive fuel testing and analysis

Why Fleet Core is Denver’s Go-To for Fuel Tank Cleaning
When it comes to fuel storage tank cleaning in Denver, we’ve been around the block a time or two. Our team has seen it all – from sludge-filled tanks to water contamination nightmares. But here’s the thing: we don’t just clean tanks, we solve problems.
We understand that every tank, every facility, and every operation is unique.
That’s why we tailor our approach to fit your specific needs. Whether you’re managing a fleet of trucks, keeping a hospital running, or ensuring your farm equipment stays in top shape, we’ve got the expertise to keep your fuel clean and your operations smooth.
Why Choose Us
Local Experts in Solving Fuel Problems

Fleet Core’s unparalleled expertise in fuel management has helped countless businesses overcome fuel-related challenges while maximizing the longevity of their storage tanks. Our thorough cleaning process not only ensures optimal fuel quality but also significantly extends the life of your valuable storage infrastructure, delivering a dual benefit that translates to substantial long-term savings and operational efficiency.
Improve Fuel Quality
- Removes contaminants, water, and sediment that can degrade fuel
- Ensures fuel meets specifications for optimal equipment performance
- Reduces the risk of equipment damage due to poor fuel quality
Extend Tank Life
- Prevents corrosion caused by water and microbial growth
- Reduces wear and tear on tank components
- Helps maintain structural integrity, potentially avoiding costly tank replacements
Enhanced Operational Efficiency
- Minimizes downtime due to fuel-related equipment failures
- Improves fuel flow and reduces filter clogging
- Ensures a consistent fuel supply for uninterrupted operations
Regulatory Compliance and Environmental Protection
- Helps meet industry standards and environmental regulations
- Reduces the risk of leaks and spills that could lead to fines or legal issues
- Demonstrates commitment to environmental stewardship and responsible operations
Our Service Offering
Fleet Core Preventive Maintenance Services
We take a comprehensive approach to tank maintenance, leaving no detail overlooked:

Fuel Tank Inspections & Diagnostics
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Fuel Tank Inspections & Diagnostics
Evaluate sediment levels, tank structure, and surface seals to detect risks early.
Advanced water-testing paste locates moisture contamination before it affects performance.

Water, Sludge & Sediment Removal
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Water, Sludge & Sediment Removal
Safely extract contaminants and prevent corrosion and microbial growth for clean, reliable fuel flow.

Fuel Stabilization, Restoration & Filtering
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Fuel Stabilization, Restoration & Filtering
Add stabilizers to maintain fuel usability in long-term storage, preventing oxidation and degradation.

Detailed Compliance Reporting
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Detailed Compliance Reporting
Receive full documentation confirming your tanks meet regulatory and environmental requirements.
Why Regular Maintenance Matters
The Risks of Neglect
Leaving tanks unchecked invites risks no operation can afford:
- Contaminated Fuel: water and sludge lead to clogged filters, microbial growth, and fuel inefficiency.
- Corrosion Hazards: tank rust weakens structural integrity and increases the risk of leaks.
- Regulatory Trouble: outdated or degraded tanks can fail inspections and incur financial penalties.
Fleet Core tackles these risks head-on, so you can focus on running your business — not worrying about your fuel system.


How Often Should Tanks Be Maintained?
Stay proactive with a schedule designed for your tank type:
- High-Use Tanks (Generators and Fleet Systems): maintenance annually ensures reliability during critical times.
- Long-Term Storage Tanks: every 2–3 years, depending on environmental conditions, prevents sediment buildup and fuel degradation.
Speak with Fleet Core to create a maintenance plan customized to your operations.
Trusted by Industry Leaders for Fuel and Lubrication Management
Fuel Delivery
Never Run on Empty Again: Premium Quality Bulk Diesel & Gasoline Delivery
On and off-road fuel delivered to your fuel storage facility or directly to your equipment. Our on-demand and scheduled deliveries ensure you’re always powered up, come rain or shine.


Diesel Fuel Testing
Know Your Fuel Quality Before Problems Start
Professional diesel fuel testing identifies contamination levels, water content, and microbial growth before they damage your equipment. Our comprehensive analysis gives you the data needed to make informed decisions about fuel treatment and replacement schedules.
Fuel Polishing
Restore Fuel Quality & Protect Emergency Equipment.
Ensure peak performance of your generators and emergency equipment with professional fuel polishing services. Remove water, sludge, and microbial growth to restore fuel quality and prevent costly downtime.


Eco-Friendly Oil & Fuel Spill Cleanup
Accidents Happen, We Can Help
Ensure peak performance of your generators and emergency equipment with professional fuel polishing services. Remove water, sludge, and microbial growth to restore fuel quality and prevent costly downtime.
Oil Analysis
Identify Breakdowns BEFORE They Happen
Detect early signs of engine wear and contamination with precision oil analysis. Gain insights that help you prevent costly breakdowns and extend the life of your fleet.

Who We Serve
Your Operations Matter: Here’s How We Help With Diesel Tank Cleaning
Fleet Core custom-tailors diesel tank cleaning to meet the needs of key industry professionals across Colorado.

Facilities Management
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Facilities Management
Keep Power Online in Critical Moments
Backup generators cannot afford compromised fuel. Fleet Core ensures your emergency systems are always ready, protecting against failures during power outages or generator tests.

Environmental Compliance Management
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Environmental Compliance Management
Achieve Total Regulatory Compliance
Avoid costly penalties with tank cleaning services designed to meet eco-standards. Our process ensures environmentally responsible waste handling, giving you full confidence in your compliance.

Fleet Management
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Fleet Management
Protect Uptime for Fleets
Contaminated fuel leads to downtime and disrupted schedules. Fleet Core keeps your fuel systems clean, so your vehicles stay on the road and revenue stays steady.

Construction Site Management
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Construction Site Management
Prevent Project Delays
Dirty tanks damage equipment and derail timelines. Fleet Core ensures your heavy machinery operates reliably under demanding conditions.
Testimonials
Our Commitment To Excellence
Fleet Core is more than just a fuel and fluid provider — we are your comprehensive ENERGY PARTNER supporting operational reliability, productivity, and sustainability.

“Great company and great service!! Employees are well trained and very professional!!”

“Fleet Core offers excellent customer service. They complete the commitments they make and take care of their clients.”

“Great Diesel and Service. Extremely low temps and Core Power didn’t let me down. I would recommend Fleet Core and Core Power diesel to anyone in the Denver area.”

“Quick and efficient on-site fuel delivery.”