This is a two part process.

We send you two field tests, one to detect DEF in fuel and one to detect bacteria/algae in fuel.

These tests are done by you in your facility.

We also will send you the container and a postage paid package to return the sample to the lab by Priority Mail. Once the lab gets the sample the test is completed and results are emailed to you within 72 hours.

This laboratory portion will give you a pass or fail report as to the fuel quality based on these characteristics:

API Gravity
Cetane Index
Water by Karl Fishcher
Distillation
Flash Point
Water & Sediment
Particle Count

The price is $249.
We will send you the sample container and a postage paid package to return the sample to the lab by Priority Mail same day it is ordered.
Once the lab gets the sample from you, you will be emailed test results within 72 hours.

Contaminated Fuel Testing FAQ | Dieselcraft

Know Before You Burn! Get clear answers about our professional contaminated fuel testing services and kits.

General Questions

What is the Dieselcraft Contaminated Fuel Testing Service?
Our $249 service combines quick field tests with a full laboratory analysis. We send you field kits for DEF contamination and bacteria/algae (diesel bug) detection. You also receive a sample container and prepaid Priority Mail return package for a comprehensive lab report.

What does the laboratory analysis test for?
The lab provides a detailed Pass/Fail report on key fuel quality indicators:

  • API Gravity
  • Cetane Index
  • Water by Karl Fischer
  • Distillation
  • Flash Point
  • Water & Sediment
  • Particle Count

Results are emailed to you within 72 hours of the lab receiving your sample.

Who should use this testing service?
Fleet managers, construction companies, generator operators, marine owners, and anyone storing diesel long-term (boats, backup power, trucks, equipment). Ideal for older fuel, after bad deliveries, or routine maintenance.

Field Tests & Process

How do the field tests work?
You perform two simple on-site tests:

  • DEF Test (#DEF-1): Detects Diesel Exhaust Fluid contamination in minutes.
  • Bacteria/Algae Test (DS-1): Checks for microbial growth (results in 24–48 hours).

Follow the included instructions — no special training needed.

How long does the full process take?

  • Order today → We ship same day (Priority Mail).
  • You complete field tests + collect sample.
  • Return via prepaid label → Lab results emailed in 72 hours.

What if I only need quick field tests?
We recommend starting with our standalone Deluxe Fuel Test Kits ($35.95) for water/clarity, bacteria, gasoline, or DEF. The full lab service is best for in-depth analysis.

Results & Next Steps

What do the lab results mean?

  • Pass: Fuel meets quality standards for use.
  • Fail: Contamination or degradation detected — fuel polishing, treatment, or disposal is recommended to protect your engines.

What should I do if my fuel fails?
Contact us immediately. We offer fuel polishing systems (FPS-400 / FPS-30), the OC-25 centrifuge, and expert recommendations to restore your fuel and prevent costly downtime, filter plugging, and injector damage.

How often should I test my fuel?

  • Test every new fuel delivery.
  • Test stored fuel every 90 days.
  • More frequently in hot climates or high-humidity areas.

Pricing, Shipping & Support

What is the cost and shipping?

  • Full Contaminated Fuel Testing Service: $249 (includes field kits + lab analysis + prepaid return).
  • Fast Priority Mail shipping (1–3 days in the USA).
  • International orders: Email sales@dieselcraft.com for export pricing.

Do you offer quantity or fleet pricing?
Yes. Call 530-613-2150 or email sales@dieselcraft.com for volume discounts and reseller information.

Need help choosing the right test?
Contact our team:

  • West Coast: 530-613-2150
  • Gulf Coast: 337-277-5417
  • East Coast: 772-215-8087

Why Dieselcraft?

Our test kits and lab service are the first and last line of defense against water, bacteria, particulates, and other contaminants that cause 90% of diesel engine problems. Protect your investment with simple, reliable testing.

Ready to test your fuel?
Order Contaminated Fuel Testing Service →
View All Fuel Test Kits →

Questions? Call 530-613-2150 or email sales@dieselcraft.com