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A 20-year-old Yanmar 2GM diesel generator fails to reach full RPM, vibrates excessively, and emits carbon from the exhaust after a winter layup.0:27 Nigel Calder identifies these symptoms as signs of imperfect combustion caused by fuel-related deposits.1:10 Modern ultra-low sulfur diesel can form a gummy, resin-like substance during storage that jams injection pump pistons and injector pintles.2:14 This sticky residue often requires a complete fuel system overhaul and manual cleaning of components, as standard fuel additives or solvents typically fail to clear the blockage once the parts are seized.2:22 To prevent this, Calder advises against the traditional practice of storing boats with full fuel tanks to avoid condensation.4:05 Instead, he recommends burning off fuel before layup to keep tanks nearly empty, then refilling with fresh, non-bio-component diesel at the start of the season.4:11 Owners should also sample fuel from the bottom of the tank before starting an engine after a long period of inactivity.4:17

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