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Mariner oil injection.disconnect

Yep - drain the oil tank and remove the line between the tank and the oil pump. You can plug the hole on the tank where the line was and just leave the tank there.

Now, disconnect the line from the oil pump where it T's into the fuel line (just before the fuel pump). Take the end that was connected to the T and connect it to the oil pump (where the line from the tank used to be). It's a good idea to fill it with oil before you reconnect it. Then plug the inlet where the oil used to feed to the fuel pump.

By simply looping the oil line back to the pump with oil in it, the oil pump will sit there "happy to pump oil" that is going nowhere other than back to itself. That allows you to leave the oil pump in place.

It also means that if you ever sell the motor to someone else who is not afraid of the oil pump failing, they can easily reconnect it.

Of all the things that actually go wrong with outboards, the oil pump failing is way way down the list (in reality). But if you will sleep better at night by bypassing it, then go for it.

Of course you do realize that the oil system mixes at a variable rate between 100:1 and 50:1 (and everything in between), so by unhooking the pump and running premix at 50:1 you will 1) burn more oil than you need to, which will -

cause excess smoke and more unburnt oil in the water (so as long as you are upwind and not a member of the EPA, not a big deal there)

cause your plugs to foul quicker and need replacement more often

build excess carbon in the powerhead which will have to be cleaned at least once per season to prevent detonation in the engine (which does kill alot of outboards - probably number 3 on the list after #1 - dirty carbs and #2- failed waterpumps) or run an additive like Seafoam all the time to keep the extra carbon in check

Over a 10 year period the cost of extra oil, plugs and cleaning or additives will be far more expensive than replacing an oil pump (which rarely fails in the first place).

Depending on the model year, it may have the motion sensor at the pump which will immediately alarm if it stops pumping. But it really is your call. The diaphram on my OMC's VRO pump did fail a couple years ago - got an immediate alarm. I replaced the entire unit (at a cost of about 400 bucks) - expensive? maybe, the original pump was 23/24 years old. But it saves me the equivalent of about 3 gallons of oil a year (with it's variable mixing compared to what I would mix for the same volume of gas at 50:1). So just the oil savings alone will pay for the pump in about 7 years (less than 1/3 of it's life expectancy if it lasts as long as the original).

You wouldn't consider ripping the oil pump out of your car and jury riggin' something up - why take it away from your outboard? (just my opinion)..
 
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