I have a riding mower with a CV-12 engine. Sometimes it stops as if out
of gas. If I remove the gas cap and wait a moment, a stream of bubbles
from the fuel line will bubble up through the fuel. Then it will start
quickly and run fine.
I don't see what could be getting pumped up with air except the fuel
pump. It's two check valves and a diaphragm operated by a nylon lever.
The outlet check valve is at the top, so I don't understand how the
pump could accumulate air.
Has anyone else run into this problem?
Thanks, Trader and Chuck. I hesitated to remove the pump because it was
grimy outside. WD-40 and degreaser fixed that. I found it clean
inside. The valves work freely and the diaphragm looks fine.
I'll go with the gas cap theory because I have no other ideas. I
haven't figured out why this would cause cause air to accumulate under
pressure in the pump. It must be under pressure if it comes out after I
unscrew the tank cap.
After it has sat a couple of says, it takes a lot of cranking to start,
as if the tank had sucked the pump dry. There's a catch: I turn the
fuel shutoff when I leave it parked.
I squirted some contact cleaner into the vent hole in the cap. I'd love
to take it apart. Maybe I can find instructions online.
Have you looked at this site to see if anything is near you ?
They list many stations that have ethanol free gas.
I switched to the ethanol free gas a couple of years ago for the small
engines and just to be sure I add in some Sta-bil to the gas. Sofar all my
small engines start and run fine. It may be over kill, but it only costs a
few dollars more per year.
Thanks, I see there's a place 6 miles from me. I wonder how they get
away with it. I thought summer gas was required to have ethanol to
Actually, it didn't occur to me that ethanol might have softened my
valves. My remarks about good gas were in fun. Whenever the price of
gas drops, I like to say I'm disappointed that I can't get the good
stuff they used to sell. At one time, when gas was red, I liked to stop
at Amoco stations to get white gas because my motorcycle seemed to run
better. Then I found out that in some parts of the country, Amoco was
red and some other brand was white.
The ethanol gas has been blamed for many engine problems. I have a 5 kw
generator and had to clean out the carborator 2 times before swithcing to
the EFG. Also it runs smoother when unloaded on the EFG. The ethanol also
is bad on some plastic parts, especially the old engines.
I think they have to sell so much ethanol so some stations can get away with
having gas without any in it on one grade of gas.
I remember using the Amco white gas in a car I had with a high performace
engine about 40 some years ago. It was either that or the Sunoco 260.
Everything else sparked knocked.
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