[C320-list] Yanmar 3GM issues

[Bob Borelli]

Both probable.

Is inline fuel valve open?
Visually inspect primary bowl for water in fuel
Check for air leaks along fuel hoses, look & smell for diesel fuel, rag wipe hoses any fuel?
Look for fuel leaks at hose clamps, air getting in?
Possible primary filter body needs another turn into Racor head, loose filter a potential air leak.
New Racor filter gaskets installed correctly in place?
Vent plug & plunger on Racor head tightened?

Bleed the system for Primary thru secondary filter, ensure no air bubbles.
If like on my Perkins, the Secondary pump handle pumps fuel out of vent plug, the fuel pump is working & not the problem.
Try to start engine.

Still no start?  Change the Racor primary filter.  If its 2 mil filter could get filled fast.
If boat rocking around on mooring or during sailing its possible debris stirred up from bottom of tank, may see debris on top removed primary filter.
New filter than bleed system.

Try to start engine.

Let us know your results.

Bob Borelli  1995 Perkins M30 on hull no. 209  Sassafras River MD



________________________________
From: C320-list <c320-list-bounces at lists.catalina320.com> on behalf of Louis Friedman via C320-list <c320-list at lists.catalina320.com>
Sent: Sunday, July 14, 2024 4:49 PM
To: C320-List at catalina320.com <C320-List at catalina320.com>
Cc: Louis Friedman <loualfr at gmail.com>
Subject: [C320-list] Yanmar 3GM issues

Hi all, looking for thoughts here- went out for a sail today -engine took a lot of priming to start but then was fine. After 2 hrs sailing it wouldn’t turnover despite more priming. Had to sail it into the mooring.  Someone suggested  maybe a fuel line clog or I need to change the primary fuel filter? Both fuel filters were changed upon launching in May- would it make sense to change again ?  Picked up Nigel Calders book on diesels but still learning.

Lou
S/v Miss Adventure
#623
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