Diesel Fuel

Dyne Fire Protection Labs, an NFPA Global Solutions company, provides independent laboratory testing for diesel fuel. Testing is conducted to evaluate fuel quality characteristics associated with oxidation, contamination, and degradation that can impact performance, reliability, and compliance.

Diesel fuel degrades over time due to oxidation, water contamination, and microbial growth. As fuel degrades, insoluble particulates and sludge can accumulate, potentially clogging fuel filters, fouling injectors, and reducing equipment reliability. Diesel fuel testing provides information on fuel quality and degradation that can be used to support maintenance decisions and compliance with applicable NFPA requirements for diesel-driven fire pumps and emergency generators.

Why Diesel Fuel Compliance Matters

Reliable operation of diesel-powered fire pumps and emergency generators depends on the quality of the fuel being stored. Because fuel conditions can change over time and contamination issues are not always visible during routine inspections, testing plays an important role in identifying conditions that may affect equipment performance and reliability.

NFPA 25 and NFPA 110 require periodic testing of stored diesel fuel to help verify that fuel remains suitable for service. Testing provides objective information about fuel condition that can be used to support maintenance decisions, evaluate fuel storage practices, and identify degradation concerns before they result in operational issues.

Diesel fuel testing provides information about the condition of stored fuel that can be used to determine whether corrective actions may be necessary. Samples exhibiting signs of degradation or contamination may indicate an increased likelihood of filter clogging, injector fouling, fuel system maintenance concerns, or the need for fuel treatment, replacement, or tank cleaning.

Diesel Fuel Testing Overview

NFPA 25 states that fuel degradation testing shall include fuel quality testing for stored fuel in accordance with applicable ASTM standards. These standards contain recommended methods for evaluating stored diesel fuel quality and monitoring changes in fuel conditions over time.

Testing is commonly performed as part of annual compliance activities, following corrective actions such as fuel replacement or tank cleaning, or when fuel quality concerns are identified. These services are typically used by building owners, facility managers, contractors, service providers, consultants, insurers, and other professionals responsible for the inspection, maintenance, and reliability of diesel-powered fire protection and emergency power systems.

Key Testing Capabilities Include:

Oxidation Stability (EN 15751) to evaluate a fuel's resistance to degradation caused by exposure to oxygen during storage.
Water and Sediment (ASTM D2709) to identify contamination that may contribute to corrosion, support microbial growth, restrict fuel flow, or clog fuel filters.
Acid Number (ASTM D664) to evaluate changes in fuel chemistry associated with degradation that may contribute to deposit formation and corrosion.
Actionable reporting to support fuel management, maintenance planning, and informed decision-making.

Free Diesel Fuel Sample Kits

Quantity Needed

1 kit = 1 - 2 samples

2 kits = Up to 4 samples

3 kits = Up to 6 samples

Kits are shipped at no cost within the contiguous United States (limited 1 -way free shipping to Alaska, Hawaii, and Canada, inquire for details), payment information is needed when samples arrive for testing
Each kit contains two 500mL sample containers wrapped in absorbent pads, paperwork, and marker
Ground shipping to you is included as well as return labels (UPS/USPS) that can be used within the contiguous United States
Standard turn-around is 5 business days
Expedited shipping & testing (24-hour) is available, please contact us for pricing
Use this kit to test: NFPA 25 & NFPA 110

How Diesel Fuel Testing Reduces Risk and Supports Compliance

Diesel fuel testing helps reduce risk by providing information on the condition of stored fuel used in fire pumps and emergency generators. Fuel quality can change over time during storage, potentially affecting system performance, increasing maintenance requirements, and shortening fuel life.

Laboratory analysis provides objective data on fuel quality characteristics, allowing owners, contractors, and facility managers to make informed maintenance, fuel management, and corrective decisions before more significant issues occur. Testing also supports compliance with NFPA requirements related to the periodic evaluation of stored diesel fuel and can help identify when corrective actions may be necessary. When deficient fuel is identified, NFPA 25 requires fuel reconditioning or replacement, supply tank cleaning, and fuel filter replacement, followed by continued monitoring to demonstrate acceptable fuel storage performance.

By proactively monitoring fuel condition and documenting fuel quality over time, diesel fuel testing helps support equipment reliability, informed maintenance planning, and confidence in the readiness of critical fire protection and emergency power systems.

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Relevant Diesel Fuel Standards and Test Methods

NFPA 25 Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems (2026 Edition Section 8.3.4.1)
NFPA 110 Standard for Emergency and Standby Power Systems (2025 Edition Section 8.3.7)

What types of samples are tested?

(TBD)

When is Diesel Fuel testing typically required?

(TBD)

How are test results delivered?

Test results are delivered via email within 5 business days or less from the receipt of the sample(s).

Who should I contact to get started?

You can contact Dyne Fire Protection Labs to discuss your testing needs.

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Why NFPA Global Solutions Diesel Fuel Testing

Dyne Fire Protection Labs, an NFPA Global Solutions company, is a full-service NFPA 25 testing laboratory that combines fire protection industry expertise with specialized diesel fuel testing services. Our approach focuses on delivering objective laboratory data that helps organizations evaluate stored fuel quality, support maintenance planning, and make informed decisions related to fuel management and compliance activities.

With more than 25 years of testing experience, we understand the unique challenges associated with maintaining diesel fuel used in critical fire protection and emergency power systems. Our testing services are designed to help organizations assess fuel condition, document results, and maintain confidence in the reliability and readiness of diesel-powered equipment.

Testing Advantages:

Test reports in 5-business days or less (with rush 24-hour turn-around available)
Free Diesel Fuel sample kits
Free shipping within the contiguous United States (limited free 1-way shipping to Alaska, Hawaii, Puerto Rico, and Canada, inquire for details)
Comprehensive reports and tank tags
Online access to results and return forms
Immediate communication with our quality technicians and customer service staff
Automatic reminder service to make sure you are always current with your testing requirements.

Order Diesel Fuel Kits

We offer free Diesel Fuel sample kits with free shipping within the contiguous United States. Please indicate the quantity needed. If you have questions, please contact us at (800) 632-2304 or dyne.lab@nfpaglobal.com.

Order today

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