Fuel Bacteria Test Kit 10-pack



Detects “Fuel Bugs”, bacteria, fungus and mold in 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.

  • Autoclave or incinerate the capped vials (loosen cap to prevent explosion). Alternatively, decontaminate inoculated slides by immersing slides overnight in a bactericidal solution (1 part bleach added to 5 parts water). Local/state/provincial laws may apply to disposal.
  • If water enters your fuel system either through condensation or vents, it can causes 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 and not biological contamination.
  • 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.
  • KMT Labs offers the fuel bacteria test kit to identify biological contaminants in the field.

Additional information

Weight 10.5 oz
Dimensions 7.25 × 3 × 3.75 in


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