Diesel Fuel Technical Resources
Practical guidance for investigating contamination, managing stored diesel and choosing the right maintenance response. Start with the condition you have observed, then follow the evidence through sampling, water management, treatment and verification.
Find the answer to the decision in front of you
A blocked filter, a water layer and an abnormal microbial test result are different findings. This library helps operators distinguish those conditions, understand what further evidence is useful and plan an appropriate next step. It is written for fuel retailers, asset owners, maintenance teams and fuel-service contractors.
| What you have observed | Start by investigating | Relevant guidance |
|---|---|---|
| Filters repeatedly restricting | The material captured, the timing of the problem and where contamination enters | Read the relevant guide |
| Water, haze or recurring bottom water | Water form, quantity, location and the source of ingress | Read the relevant guide |
| Slime or suspected diesel bug | Representative microbial testing alongside tank observations | Read the relevant guide |
| Fuel held in storage for extended periods | Fuel condition, storage history and the equipment's requirements | Read the relevant guide |
| An uncertain or conflicting sample result | Sampling purpose, location, phase and handling | Read the relevant guide |
Investigate contamination and operating symptoms
Dirty diesel: identify the condition before choosing a remedy
Separate an appearance change from a diagnosis and organise the evidence needed for a useful investigation.
Water in diesel fuel
Understand free and emulsified water, assess the source and select a water-management response.
Microbial growth and diesel bug
Connect microbial testing with water findings, tank condition and a documented corrective plan.
Diesel sludge and tank residues
Investigate deposits, consider physical access and plan removal or treatment against an identified need.
Blocked diesel filters
Use the timing, captured material and system layout to investigate recurring filter restriction.
Diesel tank contamination
Review the tank and fuel-transfer path together instead of treating each maintenance event in isolation.
Sample, test and understand stored-fuel condition
Diesel fuel sampling and testing
Define the decision, collect suitable samples and interpret results within the test method’s scope.
Stored diesel fuel degradation
Consider storage history and relevant fuel properties without relying on age alone.
Diesel oxidation and stability
Understand chemical ageing and why filtration, visual appearance and stability testing answer different questions.
Select the maintenance response
Fuel polishing versus fuel treatment
Compare physical separation and chemical treatment, and define how the result will be verified.
Preventative diesel fuel treatment
Build formulation selection, dosing and monitoring into a planned maintenance programme.
Treatment for diesel storage tanks
Plan treatment around actual fuel volume, tank condition, implementation constraints and follow-up.
Apply the guidance to your operating environment
Backup generator fuel maintenance
Connect stored-fuel condition with the readiness and maintenance requirements of standby power.
Marine diesel fuel contamination
Account for bunkering, water exposure, tank movement and the operational consequences of restricted fuel flow.
Connect the finding with the appropriate product pathway
Fuel Right treatments
Review ProActive, 15K and 30K for formulation-specific treatment functions, compatible fuels and dosing guidance.
FUELSTAT microbial testing
Compare One and Plus and select the correct diesel or aviation kit for the microbial-testing objective.
Aquafighter water management
Check tank access, stationary use, inspection and retrieval requirements for in-tank diesel water absorbers.
Product, handling and further technical information
Frequently asked technical questions
Record the symptom, when it began and which assets or tanks are affected. Start with the dirty-diesel and sampling guides, then select testing that answers the actual investigation question.
No. Microbial testing, water measurement, particle analysis and chemical-condition testing answer different questions. Select the test suite around the fuel, the equipment and the decision that must be made.
Where contamination is suspected, establish an appropriate baseline before changing the system where practicable. Record any urgent corrective action already taken because it may affect later interpretation.
No. Apply the current fuel and maintenance requirements for the actual equipment. These guides help frame questions and organise the evidence for a site-specific plan.
Use a consistent observation and sampling record, identify the decision owner and define escalation triggers. Apply the relevant guides to each finding rather than assuming every site needs the same intervention.
Provide the fuel grade, tank capacity, actual fuel volume, storage history, symptoms, sample locations and available results. Include any operational constraints and the outcome you need to establish.
Turn the technical question into a practical next step
Share your fuel, tank and operating requirements with Fuel Right Australia. Include the findings already available so the discussion can focus on the relevant product information and maintenance options.