My latest project is a 1987 Astroglass 16' bass boat.  It has a 100 hp 2 stroke Mariner on it.  I got it for a song from a neighbor.  The catch is that it hasn't been used since 2008.  When I started going through the engine, I noticed that all the lines that feed fuel to the carbs had completely deteriorated and fallen out.  So, I have cleaned the carbs and replaced all the lines that fell apart between the carbs.

 

Now I have one input port on the fuel pump that used to have a line on it that the oil pump would use to inject the proper amount of oil.  The oil injection system was deleted by the previous owner.  It looks like there was something connected to the tube (just a the remains of tube under a zip tie), but I'm not sure what that would be since the oil injection was deleted.  Should I cap this port or does it need to hook up to something?  I figure it isn't needed since I'll have to premix everything.

 

 

Unless you know for sure if there's a check valve or solenoid valve, CYA and cap it

Take out the fitting and put a plug in there.  Add oil to the fuel tank at a 50:1 ration (16oz for 6 gal of gas) before you add the gas and that will flush it on down into the tank and mix it as you add the gas.

 

A couple of other things.  I hope you rebuilt the fuel pump, if not it would be smart to do that.  

When you said you replace the hoses that had fallen off, I hope you replaced all the fuel lines.  

If you didn't replace the water pump, pretty good chance you might fry the motor the first trip you make.  Even if the blades stay on it, they are going to have so much of a set in them, they are not going to do much pumping. 

It would also pay you to change the lube in the lower unit.  

12 minutes ago, Way2slow said:

Take out the fitting and put a plug in there.  Add oil to the fuel tank at a 50:1 ration (16oz for 6 gal of gas) before you add the gas and that will flush it on down into the tank and mix it as you add the gas.

 

A couple of other things.  I hope you rebuilt the fuel pump, if not it would be smart to do that.  

When you said you replace the hoses that had fallen off, I hope you replaced all the fuel lines.  

If you didn't replace the water pump, pretty good chance you might fry the motor the first trip you make.  Even if the blades stay on it, they are going to have so much of a set in them, they are not going to do much pumping. 

It would also pay you to change the lube in the lower unit.  

This^^^

Also, forgot to mention, check the fuel tank.  If there was any gas left in it the last time it was used, there's probably a pretty good layer of tar in the bottom of the fuel tank that has to be gotten out.  Ethanol gas is going to slowly dissolve it and keep your fuel system a total mess.