90hp mercury sportjet carb question

[Cueball876]

Just picked up a 94 sea rayder with the 90 sportjet. When looking at the carbs, the the tubing on the right is the fuel supply. On the left hand side there is some 1/4 in or so tubing the runs in between all 3 carbs. On the top there is a tee....but no tubing. Just trying to figure out where its suppose to run to and what it's for??

 

[pnwboat]

The 1/4 inch tubing is for the carburetor fuel bowl vents. Important to keep the tubing open and not clogged with old thickened fuel oil mixture. Clogged vent tube with affect the fuel delivery to the fuel bowl. On the regular outboards, the vents are open to the atmosphere, no tubing. Not sure why the SportJets have the tubing. Anyways, I believe that the tubing runs from the "T" to the carburetor cover.

 

[Cueball876]

That's probably why I couldn't find where it goes, as my motor is missing the covers that go over the carbs. Any idea where I may be able to pick up the covers?

 

[Frank Acampora]

Sport jets have the tubing because the engine is enclosed inside the boat, not hanging off the back like an outboard. For this reason, although it is an outboard block, some things are different.. Gasoline vapors are heavier than air and will collect in the engine compartment. For fire safety it is important to recycle any gasoline fumes that may issue from the carb vents. Find the carb covers and properly connect the tubing to them.

 

[jerryjerry05]

No Title

Good luck finding the part.
Here's what it looks like.
In the photo it's shown from the rear.