FD – HYBRID: Water, quality & microbial fuel tests


4 tests in the 1 kit:

  • Test Part A – water in fuel
  • Test Part B – fuel quality haze test
  • Test Part C – fungus growth
  • Test Part D – bacterial growth

Part A & B – fuel quality + water in fuel 

1 x water finding agent for detection of water in diesel fuel @ 200 ppm (parts per million) & above.

1 x test bottle with haze quality indicators.

Part C & D – microbial growth 

1 x test kit for bacterial & algae problems.

1 x test kit for fungus (moulds & yeasts).

Other components

1 x pair of gloves.

1 x syringe for loading sample on test plates.

2 x clear bags for storing test plates when incubating.

1 x instructions.


Test kit suitable for all types of diesel fuel including dyed and bio fuels.

The test agent turns a deep red / bright pink when water is detected, the contrast color with dyed fuel is not as good as non dyed fuel testing but it still works with dyed fuel.

We suggest just hold test sample near a flashlight / light to view the bottom of sample, you then can clearly see for any water indicators if you are testing dyed fuel.

Test kit suitable for all types of diesel fuel including dyed and bio fuels.

contact us to order


Suitable for all types of diesel fuel testing applications

  • marine – power generation – construction equipment
  • automotive – storage tanks – transport equipment + more

Part A & B: Part # FD-1 – fuel quality + water in fuel tests

1 x test agent for detection of water in diesel fuel @ 200 ppm (parts per million) & above.

1 x 120ml / 4 fluid ounce test bottle with haze rating markers.

5 minutes to obtain test results.

Part C & D: Part # FD-BUG – fungus & bacteria tests

1 x test plate for fungus (moulds & yeasts) detection.

1 x test plate for bacteria detection.

1 x syringe for loading fuel sample onto test plates.

24 to 48 hours for test results @ 24°C to 35°C / 77°F to 95°F.

Misc. components

1 x pair gloves, 1 x instructions.

Non-toxic non-hazardous materials contained in test kits. No liquids, no gels contained in kits.

No warranties or guarantees are made regards the accuracy of the test results that you may interpret from using this kit.

If more definitive & accurate tests are required or for critical application fuel testing use a laboratory for a complete quantitative analysis.

This test kit contains no liquids, no toxic or hazardous materials.

Testing steps: Part A & B – fuel quality + water in fuel tests

FD – 1 test kit instructions:

Fill the supplied 120 ml / 4-ounce test bottle with your fuel sample, pour detection agent powder into the test bottle, screw cap on bottle and shake for 30 seconds, allow bottle to rest for at least 5 minutes and view the sample images 1, 2, 3 and 4 below to determine your testing results.

Part A: haze quality test

Pass, images 1 & 2: You should be able to view in some way the haze rating test indicator bars.

Fail, image 3: If you cannot view the bar indicators your sample has failed the visual clarity haze test.

Part B: water in fuel test

Fail, image 4: The detection powder will indicate any water present in your sample, thus turning the water into a pink, red or purple color spot for easy identification. Depending on contamination levels, water will be detected @ 200 PPM (parts per million) and higher. Best if viewed from the bottom of test bottle like in image 4 below. No spots indicate your sample is free from unacceptable water contamination – below 200 PPM.

NB: if you are testing a dyed fuel for better identification inspect the bottom of the bottle close to a light source or use a flashlight for better viewing.

Degraded, dark & water contaminated fuel negatively impacts combustion & can cause breakdowns, damage to engines / tanks & fuel system

The kit provides fast general results & can be used as a first step in fuel analysis.

Clear & bright fuel free of water & contamination is the key to a reliable engine.

The threshold levels good vs. bad fuel indicators used in the haze rating test are modelled on ASTM D4176 test standards.

If your fuel fails testing, you may need additives to stabilize / break down water / contamination in the fuel, or the need to change filters or undertake fuel servicing / cleaning to get your fuel & system back to peak operating condition.

Testing steps: Part C & D – microbial growth 

Remove the test 2 plates from packets when ready to start, remove the covers on the plates, use the syringe provided to place 1 ml of fuel onto the centre of each test plate agar, the fuel will absorb out over the agar media area.

Refit the plate covers, then insert test plates into their original foil packing bags or store them in the clear bag we provide or store in any container for incubation. Store the test plates with the lid side of the test plate upwards at all times.

Incubation steps:

Once you have completed the above steps you will need to store the plates for the incubation period at a temperature of between 24°C to 35°C / 77°F to 95°F for 24 to 48 hours.

Do not place the plates into direct sunlight to increase temperature.

If you cannot incubate within or close to these temperatures needed you will require an incubation device to achieve the optimum temperatures required – we have inexpensive incubator devices for purchase if required.

Depending on your incubation temperature and the levels of microbial growth in your fuel you may see visual signs of some problems from about 24 hours of incubation.

Should you have signs of growth at this early stage you already have positive results that you have microbial issues in your fuel samples.

Once incubated for the required times and temperatures, compare the test plates to the images on the instructions sheet provided for identifying any problems.

  • Test plate C fungus: this test will indicate mould and yeast problems.
  • Test plate D bacteria: this test will indicate bacterial problems.

Place white paper under the test plate for better viewing. You can view the test results from the top or bottom of the plate which ever side is clearer to view. Any signs of growth indicates signs of bugs in your fuel.

If your fuel fails testing, you many need additives to stabilize / destroy microbial bugs in your fuel, or you may need to undertake fuel servicing / cleaning to get your fuel & system back to peak operating condition.

Fuel bugs are not considered a health hazard to humans or animals. To neutralize any microbial residue before disposing of plates just drop some bleach onto agar area.