40 HP Evinrude seems to starve...?

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DonPedro54

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Nov 17, 2004
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10
1963 40HP 'rude. Starts and runs great for the first 5-10 minutes, after which it starts to slow down. It will then run well at about 1/4 throttle, but die if I try to give it any more. Feels like fuel starvation..? Any ideas..?
 
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Laddies

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Sep 10, 2004
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12,218
Re: 40 HP Evinrude seems to starve...?

It sounds like the tank is not venting
 
Barnacle_Bill

Barnacle_Bill

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Feb 8, 2004
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6,469
Re: 40 HP Evinrude seems to starve...?

Check your fuel tank vent. When it starts to die, what happen if you pump the primer bulb? Or is this a pressurized tank? My memory is shot.
 
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DonPedro54

Cadet
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Nov 17, 2004
Messages
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Re: 40 HP Evinrude seems to starve...?

I tried the vent and everything seems fine. Pumping the bulb did not help.
 
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lark2004

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Jul 12, 2004
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1,080
Re: 40 HP Evinrude seems to starve...?

does your model have the choke control that is connected to the exaust cover?
 
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Solittle

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Apr 28, 2002
Messages
7,518
Re: 40 HP Evinrude seems to starve...?

Get a spray bottle & put some pre mix in it. Go for a run and when it starts to slow down squirt some fuel into the carb. If it picks up that confirms that you have a fuel supply problem. I would suspect crud in the carb & time for a rebuild.
 
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lark2004

Lieutenant Junior Grade
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Jul 12, 2004
Messages
1,080
Re: 40 HP Evinrude seems to starve...?

ditto, carb is probably fouled. When rebuilding it, get a rebuild kit that includes a new plastic float. the old cork floats don't survive with todays fuels.
 
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