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115 Oil injection overfill

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  • 115 Oil injection overfill

    I noticed yesterday while driving that I was was burning alot of oil. I was leaving a trail of smoke and the oil tank (2.8 gal) was just filled and was now about the 1/2 way mark and I only burned 10 gallons of gas. I took the hood off and inspected the tank on the motor and I turned the key on and it filled the tank right to the top. I was under the impression that when the level on this tank was between the 2 marks it would not pump oil to it. 2004 115 Carb model. There is no oil leaking out of tank.

  • #2
    I tried something this morning after thinking about this, and I pulled out the float switch apparatus and drained the oil tank mounted on the engine and put back the float and turned the key on and the buzzer came on(which it should) and proceeded to pump oil until it reached the top line(which is correct). It didn't just keep pumping like yesterday. I did notice a little oil on the bottom of the shroud from yesterday.

    I believe the float switch got hung up and just kept pumping oil to the tank which is what I observed yesterday. My question now is where did all that excess oil go when the external pump keeps pumping? I thought the oil injection worked based on RPMs, why all the smoke?

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    • #3
      you get all the smoke because the overflow for the engine mounted oil tank is routed to the intake silencer. the oil fills up the bottom of the intake silencer to a point that it runs in to the bottom carb, resulting in burning excess oil (smoke). this is by design, as the idea is always to have excess oil burnt rather than spilled. it also can overflow out of the bottom silencer openings, especially when trimming engine ( oil in bottom cowling).
      your problem could also be an open in one of your oil system wiring harnesses.....

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