Diesel Exhaust Fluid (DEF) Phoenix, AZ

Does your equipment or fleet use DEF? Many modern high-efficiency diesel engines require the use of DEF. DEF works by breaking down the nitrous oxide in exhaust into nitrogen and water, making your diesel engine more environmentally friendly. Foster Fuels is proud to provide DEF delivery services throughout the Phoenix, AZ, area, offering an affordable and hassle-free way to obtain high-quality DEF.


If your equipment or vehicles need DEF, Foster will deliver it to your site. We offer DEF direct to equipment, generators and vehicles. Because we deliver DEF in Phoenix to your site, we allow you to focus on the job at hand instead of looking for a DEF supplier.


Currently, the Environmental Protection Agency (EPA) has regulations in place that require diesel trucks to have DEF in the appropriate tank in order to run properly. Engines using DEF will have indicators similar to those of a fuel tank. If the tank is low, a warning light will alert the driver. For many vehicles, if the tank is empty, the vehicle will run with a maximum speed of 5 mph until refilled. The same is often true for vehicles that have contaminated DEF in their tanks.

Foster will deliver DEF directly to you, no matter where you are in the Phoenix area. That means no more scrambling to provide your vehicles with DEF or running to high-priced retail stores. We offer same-day delivery to save you time and money.

Why Choose Foster Fuels for Your Diesel Exhaust Fluid Delivery in Phoenix

When you choose family-owned Foster Fuels, our expertise and friendly customer service ensure you receive high-quality DEF to keep your fleet running. We are a licensed fuel provider in 48 states, offering 24/7 fuel delivery services 365 days a year. This means no matter where or when you need us, we’ll be there. Partnering with Foster offers many distinct advantages to your business, fleet and equipment:

  • Same-day DEF delivery: We won’t leave you waiting around for your vital DEF delivery.
  • Auto-fill services: Don’t worry about calling for DEF. When you choose our auto-fill services, our team will check your tank and bill you as needed.
  • Full-service capabilities: We offer a wide variety of other fuel delivery services throughout the Phoenix area.
  • Capable team: With Foster, you can always count on friendly, reliable and knowledgeable service.
  • Affordable: We’ve earned a reputation for providing first-rate services at sound, competitive prices.

Contact Foster Fuels Today for DEF in Phoenix

At Foster Fuels, our goal is to exceed your expectations and establish a long-standing partnership built on trust, performance and expertise. Although we’ve been in business for nearly 100 years, we continually push our limits to ensure we’re at the forefront of innovation and industry standards. 

If you would like to learn more about mobile DEF delivery in Phoenix and our other fuel delivery services, we invite you to contact us today

Flexible Payments

Foster offers flexible payment methods and terms that suit your business. Whether you want to pay by check or a credit or debit card, or have a corporate online billing portal, we say yes! Want your tank rental factored into your per-gallon price? We say yes.

Contact Us


+1 800 344-6457

Phoenix Location
825 S. 63rd Ave.
Phoenix, AZ 85043

Call Now