225 EFI, mix gas???

[wjhuskey]

Just wanted to ask who all here owns a 225 EFI around year 1998, and mixes their gas/oil in the fuel tank? I've heard of people (including me) who are afraid the mixer may quit any day now with a motor this old. I'm thinking about unhooking the mixer and mixing my gas/oil when filling up. Yay? Nay? Advice?

 

[racerone]

???---Serial # of your motor ?

 

[Faztbullet]

If its the 3.0L it is bottom driven and rarely fails....

 

[havoc_squad]

Wouldn't running pre-mixed gas on a two stroke motor that uses fuel injectors become an issue over time of them clogging?

Not only that, how does the mixed gas get into the crankcase? It's not through the air intake because there isn't any carbs.

Can't use the oil injection inlets on the crankcase because there's no way to prevent the mixed gas from dumping in unrestricted/unmetered.

So, if you go fuel injected two-stroke outboard, I'm fairly sure that you are married to the oil injection and cannot go pre-mix only.

 

[Faztbullet]

Its fuel injected not oil injected. The fuel and oil are mixed in the VST and sent thru the injectors.. same as premix. Now DFI is a different story.

 

[wjhuskey]

The guy that I get fiberglass work done with is very knowledgeable about boats and he said he had a motor exactly like mine and recommended mixing oil in the fuel tank and unhooking the oiler. I didn't ask many details as he was needing to get back to work that day. I do know his point because I had a 2 stroke golf cart one time - the oiler quit and it was game over.

Racerone, I don't have my serial number handy - I assumed 1998 Mercury 225 EFI explained it good enough. Can get it later for you if I need to.

 

[Scott Danforth]

I would run it like it came from the factory ..... And simply go boating

 

[havoc_squad]

I do know his point because I had a 2 stroke golf cart one time - the oiler quit and it was game over.

That would be the equivalent of hearing the diagnosis "it's toast", then right afterwards the sound of losing a life on the original Super Mario brothers.

Hmm, what if Mario & Luigi were marine master techs instead of plumbers in the game?

 

[racerone]

There is a difference between early ---EFI ----systems and later OPTIMAX DFI systems.-----Time to study for some folks !!

 

[QBhoy]

Big debate on this for years. My 2 cents for what its worth.
There are a few engines in particular that are known to have oil injection pump failures. These for certain should be converted to pre mix.

Now for all the other engines out there, it’s almost never that the actual oil pump fails. It’s the pipe work around about the system or water ingress to the main tank. For these engines the probable answer is perhaps to religiously check your oil lines and fittings.

Choice is yours. Personally I was never at ease with any oil injection.

 

[Marine Services of Las Vegas]

I have never seen a failed oil pump! I have seen a destroyed worm gear caused by detonation, but never a failed one. They are damn near bullet proof.