Join Date: Jul 2000
Thanked 196 Times in 185 Posts
Rep Power: 17
Re: Yanmar 2QM15 return fuel line leak
There is no real need for a 'high pressure' line for the 'return' line as it discharges to atmospheric pressure in the tank. The return lines corrode due to possible high temperature and sulfur bearing oil (the sulphur + water ultimately forms Sulphuric acid) ... for ultimate safety replace the engine mounted return line and its 'tail end' COPPER line with double flared stainless steel tubing and not copper tube with 'compression fittings'.