dink motor question
The 2 cycle outboard on my dink is having some intermittent running problems. It will run fine at full throttle when I first start. If I stop for 30 minutes and then start up again, it will bog down and sometimes will come back up to full throttle and sometimes not... until it sits for a few days...
I have noticed the fuel prime bulb never gets hard with repeated pumping.. also the prime bulb is horizontal.. I have heard it needs to be vertical. If it needs to be vertical should the fuel flow arrow point up or down?
Thinking of replacing the bulb...
Jim Gano
Sounds like bad gas
On Wed, Jul 12, 2017 at 4:10 PM, Jim Gano via Trawlers-and-Trawlering <
trawlers@lists.trawlering.com> wrote:
The 2 cycle outboard on my dink is having some intermittent running
problems. It will run fine at full throttle when I first start. If I
stop for 30 minutes and then start up again, it will bog down and sometimes
will come back up to full throttle and sometimes not... until it sits for a
few days...
I have noticed the fuel prime bulb never gets hard with repeated
pumping.. also the prime bulb is horizontal.. I have heard it needs to be
vertical. If it needs to be vertical should the fuel flow arrow point up
or down?
Thinking of replacing the bulb...
Jim Gano
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Jim,
The arrow on the bulb needs to point 'up' while squeezing/pumping. The
rest of the time, while the engine is running, it doesn't matter.
If the bulb is not getting hard, there may be a fuel leak inside the
carburetor. That could flood the engine.
There could also be an air leak into the fuel system causing a spongy
feel to the bulb, and starving the engine of fuel.
Larry H
Retired outboard mechanic.
On 7/12/17 1:10 PM, Jim Gano via Trawlers-and-Trawlering wrote:
.
I have noticed the fuel prime bulb never gets hard with repeated pumping.. also the prime bulb is horizontal.. I have heard it needs to be vertical. If it needs to be vertical should the fuel flow arrow point up or down?
Thinking of replacing the bulb...
Jim Gano
A few days ago I posted this:
"The 2 cycle outboard on my dink is having some intermittent running problems. It will run fine at full throttle when I first start. If I stop for 30 minutes and then start up again, it will bog down and sometimes will come back up to full throttle and sometimes not... until it sits for a few days...
I have noticed the fuel prime bulb never gets hard with repeated pumping.. also the prime bulb is horizontal.. I have heard it needs to be vertical. If it needs to be vertical should the fuel flow arrow point up or down?
Thinking of replacing the bulb..."
I have since removed the bulb and it does not "hold air" when compressed and released... By this I mean when I squeeze the bulb flat and THEN put my finger over the intake end of the bulb and THEN release the bulb, the bulb immediately goes back to original shape. I purchased a new bulb and upon performing this test, the new bulb stays deformed and then SLOWLY returns to original shape when released. I am guessing the check valve in the old bulb is shot.
My fuel flow config is as follows: Check valve at fuel tank then water separating fuel filter then bulb then engine. The old bulb is inches from the engine. When I turn the engine to maneuver, the old bulb can get torqued. In fact upon removal, I noticed it slightly bent at the intake end.
I was told by a crusty old sales guy (former marine mechanic) where I bought a new bulb to put the new bulb between the fuel tank and the water separating fuel filter and have the water separating fuel filter connect direct to the engine. He went on and on about the stupidity of having it right before the engine. An obvious reason to me is that it may be more convenient to get to if the water separating fuel filter is behind a panel..
In my case, I can move the bulb with no issue. and it will prevent the engine movement from torqueing the bulb.
Has anyone ever heard about doing this?
Jim Gano
As long as there is enough slack in the fuel hose to permit holding the
bulb vertical when pumping it should work. The valves in the bulb work
by gravity, so they work when held vertical while squeezing and present
little restriction to the fuel flow when the motor's fuel pump is working.
Larry H
On 7/17/17 12:03 PM, Jim Gano via Trawlers-and-Trawlering wrote:
I was told by a crusty old sales guy (former marine mechanic) where I bought a new bulb to put the new bulb between the fuel tank and the water separating fuel filter and have the water separating fuel filter connect direct to the engine. He went on and on about the stupidity of having it right before the engine. An obvious reason to me is that it may be more convenient to get to if the water separating fuel filter is behind a panel..
In my case, I can move the bulb with no issue. and it will prevent the engine movement from torqueing the bulb.
Has anyone ever heard about doing this?
Jim,
Is it possible that the fuel tank vent is closed or blocked and you are
creating a vacuum in the tank that is preventing fuel flow?
Try loosening the fill cap.
Tom Collins - Misty Sea
Presently in Huntington Harbour, CA - returned from 7 months in Mexico