
- Water and Other Contaminant Detection
- Prevent Breakdowns and Premature Failure
- Identify and Solve Fuel Quality Problems
- Ensure Your Critical Equipment is Ready

Fleet Core’s Diesel Testing Expertise You Can Trust
When it comes to fuel analysis in Denver, we’ve seen it all. Our team uses advanced laboratory testing methods to identify problems before they become expensive headaches. We don’t just test your fuel, we provide actionable insights that keep your equipment running smoothly year-round.
Our comprehensive testing protocols examine everything from fuel stability to contamination levels. Whether you’re dealing with stored diesel that’s been sitting through Colorado’s harsh winters or managing active fleet operations across the Front Range, our testing services give you the data you need to make informed decisions. We’ve helped facility managers avoid generator failures during critical moments and fleet coordinators prevent costly downtime that could derail entire operations.
Think of it this way: you wouldn’t skip oil changes on your personal vehicle, so why gamble with the fuel that powers your entire business? Our testing isn’t just about meeting regulatory requirements—it’s about giving you peace of mind that your fuel investment is protected.
Why Choose Us
Preventing Problems Before They Cost You Money

Denver’s altitude and weather conditions create unique challenges for fuel storage and equipment operation. Our local expertise means we understand how Colorado’s environment affects fuel quality, and we’ve developed testing protocols specifically designed for Front Range operations.
Equipment Protection
- Early detection of contamination prevents expensive engine repairs
- Regular testing extends equipment lifespan significantly
- Identifies problems before they cause operational shutdowns
Cost Control
- Prevents emergency repair expenses that can devastate budgets
- Optimizes fuel purchasing decisions based on actual quality data
- Reduces insurance claims related to fuel-related equipment damage
Regulatory Compliance
- Meets EPA and state environmental requirements for fuel storage
- Provides documentation needed for compliance audits
- Ensures backup generator fuel meets emergency response standards
Operational Reliability
- Guarantees fuel quality for critical operations like hospitals and data centers
- Prevents unexpected equipment failures during peak demand periods
- Maintains consistent performance across entire fleet operations
Who We Serve
Denver’s Most Critical Operations Trust Fleet Core’s Testing
From hospital backup generators that can’t afford to fail during emergencies to transportation fleets managing hundreds of vehicles across Colorado, our fuel testing services support operations where reliability isn’t optional. We understand that when you’re responsible for keeping Denver moving or keeping critical facilities operational, fuel quality isn’t just a maintenance issue—it’s a business continuity requirement.

Fleet Management
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Fleet Management
Your Challenge
Ensuring optimal fleet uptime and performance without disruptions and escalated costs
Our Solution
Maintain fuel quality across diverse Denver-area operations and remote locations

Construction Site Management
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Construction Site Management
Your Challenge
Managing remote sites, with rigorous timelines, requiring uninterrupted fuel-dependent operations
Our Solution
Verify fuel quality for heavy equipment operating in Colorado’s challenging conditions

Project Management
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Project Management
Your Challenge
Managing tight timelines, defined budgets, environmental regulations, safety requirements, and performance expectations
Our Solution
Support city services with reliable fuel quality for emergency response vehicles
Denver’s One-Stop Shop for All Things Fuel and Lubricants

Fuel Delivery
On-Demand Fuel Supply To Keep You Moving
Our mobile delivery service brings quality diesel directly to your Denver location, eliminating trips to fuel stations and ensuring your equipment never runs dry. Emergency deliveries are available 24/7 because we understand that operational demands don’t follow business hours.
Tank Cleaning
Prevent Recontamination of Your Mission Critical Fuel
Keep your fuel system clean and efficient with expert tank cleaning services. Eliminate sludge and buildup to prevent recontamination and ensure uninterrupted equipment performance.


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.
Spill Cleanup
Accidents Happen, Eco-Friendly Cleaning Solutions
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.
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.”