<VV> Mower problem - NO Corvair

[Lonny Clark]

If the fuel tank vent is blocked, don't bother rigging a temp fuel feed -
just try running with the cap off. My mower used to do this exact same
thing and would open the fuel cap for a moment and continue mowing.

I don't have the problem anymore, the mower is old enough to develop a
crack on the top of the fuel tank.

Lonny Clark


On Mon, Nov 4, 2019 at 6:48 AM Hugo Miller via VirtualVairs <
virtualvairs at corvair.org> wrote:

> My best guess would be a blocked fuel tank vent. What I would try is
> rigging up a gravity feed to the carburettor somehow & see what it does.
> Or take the muffler off & annoy the neighbors ;)
>
>
> On 2019-11-04 15:02, Grant Young via VirtualVairs wrote:
> > This is one of those shots in the dark, but I have struck out in
> > attempts to solve a problem with my Toro Zero-Turn mower with a
> > Kohler
> > 27HP V2 engine, so I am hoping someone out there might be able to
> > help
> > diagnose. There are some Toro help sites, but no help there either.
> > The engine stars and runs fine for the first 5-10 minutes, then
> > suddenly goes into some sort of loss of power mode and backfires
> > through the exhaust (enough to blow a hole in the muffler). Taking
> > the
> > load (blade drive) off helps, but still not much power, similar to
> > having water or contamination in the gas. Then for no reason, after 5
> > minutes of this, it will jump back into the power mode and be fine
> > for
> > the next 15-20 minutes. Then another bout of power loss and back
> > firing for another five minutes, (I just sit and wait, knowing it
> > will
> > recover) then I can finish the next 2 hours of mowing without
> > incident.
> >
> > I have rebuilt the carburetor, changed the plugs and fuel pump,
> > replaced all the fuel lines, fuel and air filters, and drained the
> > tanks completely. Fuel octane doesn't make any difference nor did a
> > bottle of Heet. I also use Sta-Bil ethanol treatment, but tried it
> > once without it.  I could almost live with this except for the cost
> > of
> > patching the muffler each time I mow. Don't want to put on a new one
> > until I find the fix. It is a fairly low hour 60" mower.
> >
> > A private reply is fine. Thanks much,
> > Grant
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