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Slow throttle response

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Rob-K View Drop Down
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Joined: 29 September 2016
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rob-K Quote  Post ReplyReply Direct Link To This Post Topic: Slow throttle response
    Posted: 15 June 2017 at 22:24
I have a Hanse301 (wing keel) with 10HP Volvo MD2010-D.  After the engine has been running for 20 minutes or so the throttle response is very slow.  This is particularly alarming when maneuvering in a crowded marina because just when you want a good blast of reverse there is a delay of 30 or 40 seconds before the engine revs slowly increase.  It doesn't happen when the engine has just stared.  I have replaced the fuel filters and the fuel lift pump but the problem persists.  Has anyone experienced anything similar and if so what was the cure?
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mjo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mjo Quote  Post ReplyReply Direct Link To This Post Posted: 16 June 2017 at 09:53
Rob,

maybe "Dieselpest". When Diesel reamins for longer time in the tank, bacterias are growing in there, result is a kind of sludge which blocks your fuel lines and the filters. Have a look in you pre-filter if you have one.
The sludge you can see on the bottom of the tank. If so, you need to clean the whole system, filter all the diesel and replace filters and lines.

Regards
Martin
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Rob-K View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rob-K Quote  Post ReplyReply Direct Link To This Post Posted: 16 June 2017 at 20:36
Martin,
Thanks for the suggestion.  The fuel looked clean when I was changing the filters but I'll have a closer look this weekend.

Rob
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 17 June 2017 at 10:57
Rob,
 
it can't be Dieselpest, as this will clogg the filters completely and stop the engine. According to you description you have the roblem when the engine has warmed up. So I suspect, that you have a flawed fuel supply System which sucks i air. When you open the throttle the engine does not get immediately the full Diesel flow. I would check all Connections in the fuel line from tank to the cylinders, starting from the engine back to the tank.
Happy Hunting
Frank
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