what does this hose do? 18 HP

B

bplayer405

Cadet
Joined
May 3, 2013
Messages
29
Re: what does this hose do? 18 HP

Marineengine.com shows this hose with the same item number and shows the cover with a bleed valve in it. I'm not sure of its purpose though. It could send a fuel pump signal or pull puddled fuel from the manifold...
 
HighTrim

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
Re: what does this hose do? 18 HP

Havent looked at link, but you are likely referring to the manifold drain line to oil the upper bearing/cylinder.
 
F

F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,195
Re: what does this hose do? 18 HP

I haven't looked either, but I can tell you that the "hose, manifold to bypass cover" is a crankcase drain hose. Older models did not have such a hose because they just dumped the drainage into the lake. Around the late 1960's, they started to clean up the emissions. What used to be dumped into the lake was routed to the upper cylinder, hopefully for burning. It wasn't very effective, but hey, every little bit helps, I suppose.
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: what does this hose do? 18 HP

The hose takes excess fuel out of the intake manifold and recycles it to the upper cylinder. The EPA was just getting started. LOL
 
K

kodibass

Master Chief Petty Officer
Joined
Apr 10, 2010
Messages
864
Re: what does this hose do? 18 HP

Thanks, that explains why my 58 18hp don't have it. And a few others I've had.
 
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