DEF Search app iconDEF Search

Find DEF at the Pump

The most accurate map for diesel exhaust fluid locations, verified by the driving community.

Download on the App Store

See It in Action

Designed for finding DEF at the pump — fast, verified, and community-driven.

Find DEF at the Pump — map view of nearby DEF stationsLocation-based search results for DEF stationsUser-verified DEF stations list viewDirections to nearest DEF pump via Apple or Google MapsCustomize app style and units in settings

Built for the Road

Every feature designed around one goal — getting you to DEF at the pump.

GIS Precision

Lightning-fast distance calculations to the nearest pump, powered by spatial indexing that finds your closest DEF dispenser in seconds.

Community Verified

Every location is moderated and approved by real drivers for 100% data accuracy. No outdated listings, no guesswork.

Instant Reporting

A "drivers helping drivers" system to flag issues — no DEF available, incorrect PIN location, or fleet only — keeping the map reliable for everyone.

Frequently Asked Questions

What is diesel exhaust fluid (DEF)?
DEF (diesel exhaust fluid) is a mix of roughly 32.5% urea and 67.5% deionized water. On-road diesel vehicles built after 2010 use it in their SCR (selective catalytic reduction) system — the vehicle injects DEF into the exhaust stream to break NOx emissions down into nitrogen and water vapor.
Where can I find DEF at the pump near me?
Download and open the DEF Search App and the map centers on your location with the nearest pump dispensers highlighted. We focus exclusively on bulk DEF at the pump — not jugs off a shelf.
Which truck stops have DEF dispensers?
Most Pilot, Flying J, Love's, TA, and Petro locations have DEF at the pump on the truck side, but coverage isn't universal and some are fleet-only or cardlock. While other apps show general truck stop amenities, we specialize in DEF dispensers only, ensuring you don't waste time searching while on the road.
How is DEF Search different from Google Maps?
Google Maps will show you a truck stop but won't tell you whether the DEF pump is broken, fleet-only, or just a shelf of jugs. DEF Search is built with community features for increased accuracy — drivers verify each location and flag the bad ones, so the map stays true to what you'll actually find at the exit.