Evinrude 115 Intruder OMS Conversion and Fuel Vapor Separator

[runninfarmer]

Hi All,

I know this has been a covered a few times but I haven't exactly found what I'm looking for. I have a 1995 Evinrude 115 HP intruder and I'm in the process of converting it from the oil metering system (OMS) to a straight fuel pump. They make $130 kits for this but I'm going to do it with an $18 external pulse pump. Since it's a 60 degree looper, it has a fuel vapor separator and a special nipple outlet from the OMS that goes into the VST. A couple questions I have are:

1. Can the fuel vapor separator be completely bypassed? Is it necessary? I know it has a vapor pump powered by it's own pulse, which also supplies lubrication to upper crank. If I completely bypassed the vapor separator, could I tee in those lines to my regular pump to provide that needed lubrication? I would plug the secondary pulse port on the block.

2. The reason I want to bypass the whole system and tee in my carbs directly is this special nipple (has two O-rings) fitting for the carb side of the VST. I'm trying to use the old OMS one but it isn't built with a hose barb for connecting to a hose. Does anyone sell a hose barb version of this nipple? I also don't want air getting into this connection.

Thanks in advance for the help!

 

[flyingscott]

If the oms pump has not failed on the fuel side just disconnect the oil side and run pre-mix.

 

[runninfarmer]

I've already purchased a new pump and would like to go to that route, since it's simpler. I'm going to design and 3D print a bracket for it, I'll report how it works. I'm going to try and 3d print a replica of the fuel fitting also, but with a hose barb end.

 

[runninfarmer]

Got the new pump installed with my custom bracket. Found out I need to alter it a bit so I can fit the carb cover on. Also bought a 90 degree elbow nipple that I used for the fuel pump-to-vapor separator, OMC part number 345239. Had to file down the ridges on the end. Did a test run before winterization and ran pretty good, here's a video:

https://www.youtube.com/watch?v=fkYe...&feature=share

 

[Faztbullet]

You need to cut some ribs on that or pressure will slowly push hose off no matter how tight its clamped and how did you secure it into fuel bracket????

 

[runninfarmer]

Right now it's just pushed in with the hose providing the support. That's how the $130 ones do it as far as I can tell, like the one sold on Maxrules. There's one barb (sort of) from where I sanded down the circular ridge.