DS-1 Test Kit: Tests for Bacteria (Algae) in Your Fuel.

  • Simply dip the test into the fuel and wait a day.

  • 1 side detects BACTERIA – 24 to 36 hrs after exposure
  • 1 side detects MOLD – 36 to 48 hrs after exposure
  • 1 Individual Test per Package.
  • Works in ANY Fuel.
  • NO Spots are Good News. Any Reaction is Bad News.

For annual mandatory generator testing  use the drop down to see our 3 in 1 Test Kit Package. DS-1 Bacteria with FCT-100 Fuel Clarity and Water Content Tests $29.95.

Call us for quantity prices and reseller information.

DS-1 Bacteria Test

Diesel Fuel with Gasoline Test #GAS-1

  • Tests for Gasoline in All Diesel Fuel
  • This test will indicate a minimum of 10% of gasoline in diesel.
  • The larger the bubbles indicate the higher percentage of gasoline in the fuel.


Gasoline in Diesel #GAS-1


Diesel Fuel DEF Test #DEF-1

  • Did someone put DEF in your fuel tank…find out now.

  • Tests for Water and DEF in All Diesel Fuel
  • This is a PASS or FAIL test.
  • Kit contains 1 test tube, 10 test strips and 1 transfer pipette

Test Procedure
Remove one test strip from the package
Place the colored end down into the test tube
Add questionable liquid.
DEF will turn BLUE/GREEN in a few seconds.

Diesel Fuel Water and DEF Test

Only $7.50 for ONE TEST


Need more than one test

Quantity 10 Tests Per Kit

W-5 Test Kit: Test For Water in the Diesel Fuel

  • Remove the capsule from a test tube.
  • Add fuel to the test tube.
  • This is a PASS or FAIL test.
  • Test indicates trace amounts of suspended water in diesel.
  • Any detection of suspended water turns pink. The fuel FAILS.


Diesel Fuel Water Content &
Fuel Clarity Test


FT-100 Diesel Fuel Water Content & Fuel Clarity Test

Test Procedure One – Fuel Clarity Test.
Test is designed as a field PASS or FAIL
Test detects water and solid contaminants in diesel fuels.
If all 5 indicator marks are visible then the test PASSES.
If the indicator lines disappear then the fuel FAILS.
Failed tests require Fuel Polishing/Maintenance.

Test Procedure Two – Suspended Water in Fuel

  • Added powder will start to settle to the bottom
  • 200-500 ppm water will give you pink spots in the powder
  • 600+ ppm water will turn the powder hot pink
  • Hot pink is a FAILED test and action must be taken


Diesel Fuel Acid Test #PH-1

Diesel Fuel Acid Test #PH-1
  • Test the pH of the water from your water separator
  • Any pH less than 6 means the fuel is Acidic
  • The more acidic the more damage it is doing to your fuel tan
  • Kit consists of 1 test tube ,10 test strips and 1 transfer pipette
  • Results are immediate.
  • This is NOT a DEF Test.

Test Procedure
Take the water sample using the supplied pipette
Add it to the test tube until the tube is ½ full
Acidic water will show as pink to red

PH-1: Diesel Fuel Acid Test




Why Fuel Testing?

How clean is the diesel fuel that you’re relying on? Never assume fuel quality is not an issue. If you’re not using diesel fuel test kits on a regular basis, you probably don’t have any idea what kind of condition your diesel fuel is actually in. Change that today by investing in test kits for diesel fuel from Dieselcraft. Our kits are designed to test for the presence of microbes and water in diesel fuel so that you’ll know whether or not you have to worry about bacteria, mold, and more affecting your fuel supply as well as your diesel engines and its fuel injectors.

Dieselcraft can supply your company with a wide range of diesel fuel test kits. From the relatively straightforward DS-1 Test Kit that will check for bacteria in your diesel fuel to the more advanced FCT-100 Diesel Fuel Water Content & Fuel Clarity Test that tests diesel fuel, biodiesel blends, and even heating oil, all our tests are easy to use and will provide you with real-time results in 5 minutes or less, in most cases. They include all the supplies and instructions you’ll need to look for microbes and water in diesel fuel.

If your company has stored diesel fuel, it’s a good idea to use diesel fuel test kits on it every 90 days to make sure water hasn’t found a way to get into it. You should also get into the habit of using test kits on fuel deliveries to make sure there aren’t microbes and water in diesel fuel before you accept it. It’ll help you avoid a headache later and allow you to steer clear of using diesel fuel that could potentially have bacteria, mold, fungus, or even dangerous asphaltenes in it.

Take a closer look at each of the diesel fuel tests kits available through Dieselcraft here. Contact us at 530-613-2150 on the West Coast, on the Gulf Coast 337-277-5417 or at 772-215-8087 on the East Coast for additional information on dealing with microbes and water in diesel fuel.