Thread: Removing Auto Oiler On 40 HP Mercury

I dont understand why you'd remove the pump. I've owned Johnson motors but have always just disconnected the electrical wiring for the pump and the alarm, and plugged the oil line. Why remove the pump?!?

Originally Posted by gabowman

I dont understand why you'd remove the pump. I've owned Johnson motors but have always just disconnected the electrical wiring for the pump and the alarm, and plugged the oil line. Why remove the pump?!?

I wondered about that myself.

He needs to remove it temporally to take the drive gear off. You do not want the pump operating with no oil going to it. There is no wiring going to this one. The only wiring involved is for the low oil level alarm.

Originally Posted by Barnacle Bill

He needs to remove it temporally to take the drive gear off. You do not want the pump operating with no oil going to it. There is no wiring going to this one. The only wiring involved is for the low oil level alarm.

Well....trying to figure out what that would hurt.....so the pump wears out....your just leaveing it on there to block a hole. I don't understand.

First I want to thank Bill for all his help, and everyone else too. Bill I'm almost certain the pump has a gas line going in at the pump.
If you'll look at the diagram you posted there is a nipple at the top left on the pump, about 10 or 11 o'clock.
So could this be a oil and fuel pump together?, If so would I need to leave the gear in to pump gas, it would have oil in the gas from me mixing it.
That might be why the gear is plastic instead of metal to keep from
having a blow up from a spark from a metal gear...I don't know.
I guess I'm making things worst by thinking to much...lol
crappie cowboy

That hose is the output of the VRO. It adds the oil to the fuel line between the fuel filter and the fuel pump.

Originally Posted by "G"

Well....trying to figure out what that would hurt.....so the pump wears out....your just leaveing it on there to block a hole. I don't understand.

With no oil flowing thru it it may not just wear out but disintegrate causing major damage. The hole must be sealed to maintain vacuum integrity in the crankcase area. Its my understanding that Evinrude makes a plate to seal the hole for some models but Merc doesn't make one. Also some models the fuel pump is part of the VRO which causes different problems when doing away with the VRO. There are a lot of variables out there between models and manufactures which adds to the confusion.

OK Bill, I didn't know. I have heard a few folks say they just cut the wires going to the low oil alarm and started mixing oil with their gas. Now I can see from what you say that they are doing it the wrong way.