Warning! New filter system on new Yanmar engines is Bad! - Page 6 - SailNet Community
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post #51 of 51 Old 08-23-2019
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Re: Warning! New filter system on new Yanmar engines is Bad!

Pictures are better than words. This is from ~1995-2008. Component part numbers need updating, etc.

Other suggestion, that 12vdc 'bleeding' pump in the upstream probably should be replaced with a 12vdc full-on diaphragm-type pump plus 3 valve block & bypass ... as a backup for a failed engine lift pump - not cheap.

... Plus, that pump in 'pressure feed mode' and an emergency scenario will add about 6psi to the fuel delivery system ... you'll realize the value of adding 6 psi to the fuel system when you carefully scrutinize your Racor filter's flow chart diagram (GPM per PSID) ... more additional flow through a partly clogged filter !!!!!
Note: pressure feed is for fuel systems monitored constantly by a marine engineer, as if you have any piping, etc. failures with pressure feed on the system, you are vulnerable to filling the bilge and overboard in a hurry. All pressure feed systems should have double flared connections (NEVER with 'compression' fittings), and well rated pressure service design for the entire fuel system .... plain rubber hoses are strictly 'verboten'. Pressure feed systems rarely need air purging or 'bleeding' to affect a 'restart'.

FWIW - the common fuel system design on recreational boats are specifically designed to FAIL EASILY ... any time there's a fuel system failure, a vacuum feed system automatically 'sucks air'; and, instantly shuts down the entire fuel and engine system, usually with no oil leaks into the bilge, etc.
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Fuel System.jpg  

Last edited by RichH; 08-26-2019 at 10:38 PM.
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