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Old 11-09-2015, 14:17   #1
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Yanmar 3hm

Sometimes my engine's rpm vary by 600. Cruising along at 2100 rpm it drops to 1500 then back up and down continuously. If I back the throttle to 1500, it still drops the 600. Clean fuel, clean filters, And a new primate fuel pump haven't helped. Also, it is only an occasional issue. Any ideas?
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Old 12-09-2015, 04:22   #2
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Re: Yanmar 3hm

Governor issues, injector pump???
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Old 12-09-2015, 04:40   #3
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Re: Yanmar 3hm

Tank vent clear?
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Old 12-09-2015, 06:07   #4
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Re: Yanmar 3hm

Greetings and welcome aboard the CF, WindSong.
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Old 12-09-2015, 06:46   #5
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Re: Yanmar 3hm

Quote:
Originally Posted by Hobie_ind View Post
Tank vent clear?
+1

Or air leaks in the fuel supply...

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Old 12-09-2015, 13:57   #6
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Re: Yanmar 3hm

Tank vent clear.
It happened last year at season end so I changed the primary pump. Worked perfectly all season until last weekend. Next day was fine. I hate intermittent issues!
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Old 12-09-2015, 14:07   #7
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Re: Yanmar 3hm

A diesel may do that from air in the fuel line, or restricted fuel. Maybe you have something clogging the pickup tube in the tank would be a good guess.
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