Fuel has been causing me issues since I returned from vacation.
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We also had an extra test done on our HFO380 and found that it contained trace amounts of fatty acids and phenyls. These are not supposed to be in the fuel at all but I do not think they contributed to our problems.
Postscript to this story. We battled with the quality of the HFO throughout our Guinea field service. However in May a dredger from Belgium contracted to dredge the port in Conakry loaded the local HFO we had been using in Guinea and had huge problems. It was re-assuring to me that it was not just us.