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 fuel quality. Over time, fuel can degrade or become contaminated in ways that are not visible during routine inspections, potentially affecting 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, supports maintenance decisions, and helps identify degradation or contamination before operational issues occur. Results can indicate an increased risk 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 test reports that provide clear results and recommendations, helping system owners, contractors, and authorities having jurisdiction make informed maintenance and compliance decisions.

Free Diesel Fuel Sample Kits

Standard Turnaround: 5-business days

Expedited Testing Available: Contact us for pricing.

Quantity Needed

1 kit = 1-2 samples

2 kits = Up to 4 samples

3 kits = Up to 6 samples

Applicable Testing

NFPA 25
NFPA 110

Kit Includes

Two 500mL sample containers wrapped in absorbent pads
Sample return form (online form preferred)
Marker
UPS Ground return label (in the contiguous US)‍

Shipping:

Ground shipping to you is included, as well as return labels (UPS/USPS) within the contiguous United States (limited free 1-way shipping to Alaska, Hawaii, Puerto Rico, and Canada; inquire for details). Expedited shipping is available at your cost.

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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Dyne is accredited for ISO/IEC 17025 - Chemical Testing of Diesel Fuel

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)

Test Methods: ASTM D664, ASTM D2709, EN 15751

What types of samples are tested?

Diesel fuel and biodiesel fuel

When is Diesel Fuel testing typically required?

Diesel fuel shall be tested for degradation at least annually. Biodiesel fuel might need to be tested for degradation more frequently.

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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It is the responsibility of the property owner or designated representative to ensure the sample information provided is correct and to correct deficiencies or impairments, including identifying and replacing any recalled products. The results relate only to the sample(s) tested using a limited number of laboratory-scale methods and do not guarantee the system will operate properly.

For more information,please review our Legal Notice page.

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.

Additional Resources

Diesel Fuel Sample Report

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Sample of a Completed Diesel Fuel Return Form

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Diesel Fuel Sample Return Form

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Diesel Fuel Testing Explanation

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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