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Fuel Microbe Test Kits

Detect"Fuel Bugs", bacteria, fungus, and mold in diesel fuel.

If water enters your fuel system either through condensation or vents, it can cause bacteria growth. Many species of bacteria, mold, and fungus can grow in diesel fuel but not algae. The scientific names for the most common types of organisms that live in petroleum products are Cladosporium resinae and Pseudomonas aeruginosa.

Algae growth in fuel is a misnomer for the problem. What looks like algae may be in fact asphaltene or diesel sludge. Asphaltene is a chemical problem inherent in diesel fuel or it most likely is a bio-mass that forms around bacteria to protect it. This can be treated with Dieselcraft Technol 246 sludge dispersant. The use of a biocide will do nothing until you break up that protective bio-film.

Unless you drain your tanks 100%, you always have old fuel in your tanks. This old fuel most likely has one of two problems, biological or chemical. To determine the problem so it can be treated, we have produced a fuel test kit that will identify biological contaminants.

Technol 403 diesel fuel improver

DS-1 Fuel Test Kit

Works in ANY fuel.

This test is called a "dip slide". One side of the slide is "white". This will detect BACTERIA between 24 and 36 hours after exposure. The other side of the slide is "off white". This will detect MOLD between 36 and 48 hours after exposure.

NO spots are good news. Any reaction is bad news.

Buy 10 test kits and get a free bottle of 246 Tank Cleaner that will treat 275 gallons of diesel fuel. A $25 value.

All prices are for US domestic sales only. Export sales are subject to all shipping, duty and VAT fees in the destination country
Item Price Buy Now
DS-1 Diesel Fuel Test Kit - 1 test kit
Buy 10 test kits and get a free bottle of 246 Tank Cleaner good for 275 gallons of fuel.
DS-1 Diesel Fuel Test Kit - 25 test kits @ $14.50 each. Plus one free 8 oz bottle of tank cleaning chemical 246 good for 275 gallons of diesel fuel.

Usage Instructions

1. Simply remove the slide from the tube. DO NOT touch the slide surface. The slide will detect bacteria on you fingers.

2. Dip the slide into the fuel for 30 seconds. Take a fuel sample from the fuel filter or water separator.


3. Remove the excess fuel. And then put the slide back into the tube.

4. Put the tube in a desk drawer or any dark location for 24 hours.

5. Inspect the tube at 24 hours, 36 hours and 48 hours. Any reaction requires immediate action on your part.

For disposal fill the tube with household bleach. Re-insert the slide and place in the trash.

4-in-1 Fuel & Tank Contamination Test Swabs


4-in-1 Fuel & Tank Contamination Test Swabs

4 In 1 Fuel Test Swabs:

  • Water Contamination
  • Rust/Scale in Tank
  • Fuel Oxidation
  • Sludge/Asphaltines

What's in Your Tank?

Water Infiltration: Over time, water can accumulate undetected, leading to:

  • Bacterial Growth
  • Mold
  • Yeast
  • Diesel Bugs

These appear as sludge coating the bottom and sides of the fuel tank. In extreme cases, bacterial growth that looks like strands of hair begin to accumulate.

To maintain good "fuel hygiene," you should test your fuel tank often:

  1. Make sure your vehicle is parked on a level surface
  2. Follow the instructions outlined in the chart below

Fuel & Tank Test Chart

Step 1: Attach swab to extendable probe.
Step 2: Submerge swab into fuel tank until touches lowest point at bottom of tank. Brush tank bottom several times with swab.
Step 3: Compare to diesel fuel & tank test charts

Link to Brochure

Dieselcraft Fuel Test Kits Video

Dieselcraft offers diesel fuel test kits to detect bacteria or mold that may grow in fuel tanks. These test kits and also be used to detect bacteria in jet fuel, as well as in water or on hard surfaces.

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