Mystery rubber tube on 9.9 carb

[RS60 mark]

I have a 1998 Mercury 9.9MA. It has what I am guessing is a Bodensee carb?? It has the automatic starting fuel enricher (the black solenoid cylindrical looking thing) on top of the carb.

My questions are about the small rubber hose about 3/16" outside diameter that is attached at one end to a brass fitting on the rear of the carb body. The other end of this hose is not attached anywhere, and seems to just dead-end in outer space while being held captive to the carb by a "rubber band". The hose is about 5" long and cut at an angle on the open end.

What does this hose do? Is it supposed to be attached to anything??

 

[Mi duckdown]

Re: Mystery rubber tube on 9.9 carb

Serial number and pics would help.

 

[RS60 mark]

Re: Mystery rubber tube on 9.9 carb

Serial number is: OH 016337 1998 9.9 MA 4ST

The "mystery tube" originates on brass fitting below idle adjust screw in picture. What is the purpose of this tube? Should the loose end be attached to something?

Thanks!!

 

[carholme]

Re: Mystery rubber tube on 9.9 carb

Your s/n comes up as:

MERCURY - ( 9.9 H.P. (1998 ))
Serial No: 0H016337 Model No: 1F10203UD

Parts and Service Bulletin List for s/n 0H016337:

Search Results - Crowley Marine

The hose in your picture should be item 5 under Carburetor in the Parts List. Anytime you have a hose/pipe secured at one end and the other end open with an angular cut, that is usually a breather/vent tube.

The service manual you require is P/N: 90-827857R1. If you do not have this manual, see my message to you in Notifications at the top of this page.

Gerry

 

[RS60 mark]

Re: Mystery rubber tube on 9.9 carb

Thank you Gerry !!!! See me in your "notifications".

Thanks again (huge confusion eliminated!)