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Old 26-08-2014, 10:45   #16
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Re: New Yanmar not starting straight away, what do I check?

Originally Posted by a64pilot View Post
I would suspect air in the fuel lines, unless of course it's idling lower than spec, but I still bet air.
You need to find someone to show you how to change your own filters, drain water from the pre-filter and bleed air from the system, it's a skill you will need to have as eventually you will be faced with having to do it without a mechanic available.

A very slight leak will introduce air in the fuel line, especially if it's been sitting and it will be hard to start or keep running. Get someone to teach you how to bleed the lines, change the filter, etc. Check all of the hoses for chafing, leaks (it's a suction system unless you've installed a lift pump at the fuel tank, so leaks might not show up as diesel in the bilge) loose hose clamps, etc.

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Old 12-09-2014, 13:10   #17
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Re: New Yanmar Not Starting Straight Away, What do I Check?

Thanks again for the advice. We continued to have difficult starting so I tightened the hoseclamps on the engine fuel lines, and tightened the filters by hand as well. It seems to have resolved the issue I suspect it may have been the hoseclamp that you remove to bleed the engine. The mechanic removed it and bled the engine when he changed the filters, and I turned the screw another 90 degrees when tightening it.

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Old 12-09-2014, 17:29   #18
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Re: New Yanmar Not Starting Straight Away, What do I Check?

Had the same problem with 3JH5E, very good maintenance shop could not find the the problem, finally a mechanic suggested routing the fuel return line as high as possible above the engine. Solved the problem. Suggested this fix to a person who had the same problem, he rerouted and fixed his problem also. We both had to lengthen the return line to get the height required.

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