Fuel in Oil

[shipcamein]

Update and review from previous post...

Fuel in my crankcase oil. 1999 Evinrude 9.9HP fourstroke outboard.

Changed oil and filter, ran 2 hours high speed, changed oil - no fuel, or not enough to see.

Just spent weekend fishing away from home - totaled probably 20 hours of trolling speeds (with intermittent WOT).

Plenty of fuel in oil now. I'm thinking fuel pump next.

Any other thoughts?

Thanks!

 

[AlTn]

Re: Fuel in Oil

do you have the manual or electric primer?..if electric, is the red handle in the electric or manual position?..if manual, any possibility fuel is leaking through it into the intake?... a stuck float needle in the carb will also cause flooding as long as fuel is being fed to the carb. Do you unhook the fuel line from the tank when you aren't using the engine?

 

[shipcamein]

Re: Fuel in Oil

I think it's a manual prime - I squeeze the ball...?

The fuel is always disconnected when not in use, as it will not tilt easily with the line attached.

 

[AlTn]

Re: Fuel in Oil

to start it..do you push the key in and this actuates a solenoid which opens a valve and the pressurized fuel from the fuel line squirts into the intake as long as you hold the key in?...or do you pull on a plastic knob/handle near the carb?...other than entering the crankcase through the fuel pump your engine should run really rich and foul the plugs quickly if enough fuel was entering through the intake to wind up diluting the oil in the crankcase. Have you removed the fuel pump from the block leaving the fuel line from the tank attached and then pumped the primer bulb to check for leaks through the back of the pump?

 

[shipcamein]

Re: Fuel in Oil

Yes, electric prime - for me, that's mentally the "choke," the ball is the "prime," thus my confusion! Push the key in, correct. If it's running very rich, it's not obvious. It runs great, fast or slow. I have not removed the fuel pump - checking for leaks there seems simple enough - will do!

 

[AlTn]

Re: Fuel in Oil

don't know about that pump, but some you need to thread a couple of small nuts onto the mounting bolts after you remove the pump from the block in order to hold the sections of the fuel pump together while pumping...any disturbance to the springs and valves inside that pump are bad juju..btdt

 

[boobie]

Re: Fuel in Oil

Bad fuel pump or running to cold.