I don’t have a fuel issue, as I often get either some smoke or some raw fuel coming out the exhaust when it finally starts, so there’s plenty of fuel in my case.
I found article in 48 North with a simple DIY test to see if it’s piston rings or valves causing a compression problem. I’ll try this to see if it shows any results. Thank you everyone for the input. Diesel Deep Dive: Magic Inside Your Cylinders - 48° North <https://48north.com/instructional/diesel-deep-dive-magic-inside-your-cylinders/> Richard Arper rtar...@wavecable.com C&C34+ From: ALAN BERGEN via CnC-List [mailto:cnc-list@cnc-list.com] Sent: Saturday, June 7, 2025 12:37 PM To: Stus-List Cc: ALAN BERGEN Subject: Stus-List Re: Yanmar 3GM30F starting On my 3GMf (20hp) I have to increase the throttle a little in order for the engine to start. It hasn't been a big deal, so I haven't looked into the cause. It didn't do this when I first got the boat (25 years ago). I replaced the fuel line some time ago, and I'm wondering whether I didn't tighten it enough, so that the fuel might be flowing back into the tank when the engine hasn't run for a while. With the fuel line empty, it would take some cranking for the fuel to come back. I'll check the connections the next time I'm at the boat. I'll also check the air filter as recommended in Meredith Anderson's article in Practical Sailor. Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR On Sat, Jun 7, 2025 at 12:02 PM Richard Arper via CnC-List <cnc-list@cnc-list.com> wrote: I’ve tried every imaginable throttle position, and yes, full seems to work best as the manual suggests. I read somewhere that when the throttle is in the full position, it actually retards the injection pump to assist in starting. Richard Arper rtar...@wavecable.com
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