Regional differences in the quality of transit fuels continue to worry shipowners and tenants. Unfortunately, advanced treatment techniques and mixture components over the past 30 years have caused a reduction in waste oil quality. In addition, the demand for low sulfur fuel and the use of improper mixture components allowed the emergence of problematic products. Some marine fuels turned into dumps of chemical waste and organic matter. Therefore, machine damages and time losses caused by fuel quality problems were frequently encountered. The damage caused by these problems became more complicated by unskilled personnel, insufficient paperwork and evidence, not taking or keeping the representative sample, not keeping the consumption documentation correct, not having or analyzing fuel analysis reports. In some cases, it became apparent that the apparent properties of the fuel quality are similar to the representative sample, but when a thorough analysis is made, it is not at all. Machine failures are difficult, but proved to be due to these reasons. The most important factor in controlling this situation is that all representative fuel samples are taken under the supervision of the authorized personnel of the ship, at the same time as the refueling, by means of dripping from the fuel manifold and carefully stored. The knowledge, experience and experience of the staff should be updated with regular training programs and seminars. Equipped personnel must be attentive and witness to the operation, without missing any details. The product received with the signature of the authorized personnel is now in the responsibility of the buyer. After this stage, only the ethical rule, rules and practices are valid for the missing or wrong task. In official form, documents are valid. Each document confirmed must be read and understood. Afterwards, legal rules binding by fuel contract are intervened, the defective party compensates for damage and loss. The bunkerist is determined to coordinate the activities it carries out with all its business partners with regard to the consideration and follow-up of these responsibilities. Store questionable fuel samples as long as possible Make sure sample is present and maintained for analysis The faster and earlier the problem reaches the local supplier, the quicker and easier the solution will be. The interaction of fuel with other products and the full use of it makes the situation difficult. An extra sample of each fuel has the benefit. It is not binding but saves time. You can have an idea about the product without using it yet. Let’s not forget that the main sample highlighted between the lines is the sample kept by the supplier. If the problem occurs, the agreed sample should be sent to the analysis immediately. Get technical support. Discuss the results and analytical work with your technical department and machine manufacturer Discuss with the supplier the measures to control and minimize damage In the event that the fuel mediated by the bunkerist is not suitable for use, it is determined to coordinate the activities carried out with all business partners in respect of damages and damages by the supplier.