How to test fuel for Diesel Exhaust Fluid (DEF) contamination.

Testing for DEF (Diesel Exhaust Fluid) contamination in diesel fuel is an essential process to prevent potential engine damage. Here are the steps to test for DEF in fuel:

Get a Dieselcraft DEF Test Kit: DEF test kits are readily available and easy to use. You can purchase them online at

Collect a fuel sample: For accurate results, collect a fuel sample from the tank or fuel line using a clean container. You can use a hand pump or a drain plug to do this.

Perform the test: Follow the instructions provided in the DEF test kit.  If  DEF is present in the fuel, it will cause a distinct color change to the test strip in the kit.

Interpret the results: The test kit will come with a color chart that indicates the

If the test results show that DEF is present in the fuel, it is essential to address the issue immediately. Continuing to use the contaminated fuel can lead to significant damage to the engine and fuel system. Drain the fuel tank and flush the system thoroughly to remove any remaining DEF.

In conclusion, testing for DEF contamination in diesel fuel is a simple process that can save you from costly engine repairs. Use a DEF test kit and follow the instructions carefully to ensure accurate results. If you find DEF in your diesel fuel, take immediate action to avoid further damage to your vehicle.