Home-made fuel polishing system: NO MORE DIESEL BUG! - (Episode 351)
15 February 2026 · 23 min · 192K views · Langkawi Island
Crew in white suits apply fiberglass to catamaran hull.
What this video covers
The owner of a Lagoon 450 installs a custom fuel polishing and transfer system to mitigate diesel bug and enable cross-tank fuel management.2:08 The design utilises existing Racor water separators and a new 10-litre-per-minute pump to circulate fuel between port and starboard tanks.12:44 During testing, the system achieved a flow rate of 5.7 litres per minute, exceeding the Racor filter’s 3.75-litre-per-minute specification.14:38 To address the excessive flow, the owner considers throttling the supply valve or installing a flow meter to monitor transfer rates.5:05 The setup includes one-way valves on engine return lines to prevent back-feeding and allows for isolating tanks during engine operation.0:19 Separately, the crew performs hull repairs on the hard, using polyester resin for areas above the waterline and epoxy for submerged sections.17:21 After drying moisture-damaged balsa core for two weeks, the team applies fibreglass layers to restore hull integrity.21:35
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