year of a mercury 4hp outboard

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wilbur-john

Cadet
Joined
Sep 9, 2005
Messages
15
Recently bought a 4hp Mercury outboard, Moder # 9090140. Any idea of the year, also the knob on the right side of the engine, is it a fuel shut off? Does the opening on the front nest to the choke, a hose connection for an externial tank.
 
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Paul Moir

Admiral
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Nov 5, 2002
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6,847
Re: year of a mercury 4hp outboard

Is that a 2-cylinder model?<br /><br />If so, the knob on the side is the fuel shut off. Shut the fuel off before tilting it up or else it tends to leak gas out the carb from the tank.<br /><br />The large hole is indeed for a seperate tank connector. But the fuel pump and connector was an option (no longer available).
 
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Paul Moir

Admiral
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Nov 5, 2002
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6,847
Re: year of a mercury 4hp outboard

The engine plate with the model # also says made in Belgium, will this make a differance on the year. Also it does have a fuel pump behind the remote plug.
Click to expand...
(we'll try to keep this all in one post rather than starting new topics)<br /><br />Not really, we already "knew" it was from there due to the model number being in the European 1976 range:<br />40 (4.0hp) 9075839-9141798 1976 2 cyl Gnat<br /><br />So you've got the built in fuel pump for an external tank then? I look after one of these which my brother uses on his sailboat, and I've been keeping my eyes open for that pump. I'm envious. ;)
 
JB

JB

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Mar 25, 2001
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45,907
Re: year of a mercury 4hp outboard

Outboard Non-repair.<br /><br />What part of "not engine topics" did you miss?
 
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