
Engine Model:
RV150 and SV150
RV40, V35
Page
11 of 36 Mountfield150cc Selfhelp Guide 2011, Issue 1.0
A: Fuel requirements:
These
engines run
on ordinary
un-leaded
fuel. The fuel
tank holds 0.8
litres.
Stale fuel or
build-ups in
the fuel tank
are most
common
when the
mower has
been stored
for a period of
time (e.g. over
the winter
period)
The fuel tank on these gravity-fed engines breathes through the
thread on the fuel cap. An air lock may be created if the fuel cap is
too tight……this would cause the engine to cut out. The remedy is
to remove the fuel cap to let air back into the tank, replace the cap
and tighten it just finger-tight.
Because fuel can separate over a period of time we advise that the
engine be drained of fuel before storage for more than 30 days.
One should only buy fuel in quantities that can be used up within a
few weeks.
When emptying stale fuel from the engine place the mower on
a solid surface, or patch of gravel or similar (fuel spillage may
kill the lawn/stain a patio).
To drain the fuel, remove the H.T. lead (spark plug cap) for safety,
remove the air filter (for visibility), and tilt the mower BACKWARDS.
Viewed from the front, to the left of the spark plug and to the right
of where the air filter was you will see the float bowl on the
carburettor. A bolt holds the bowl in place on the very bottom, but
on an angle slightly closer to you is another bolt with a red washer.
With a 10mm spanner undo this bolt on the angle and remove it
(taking care not to lose the washer). Allow the petrol to drain
completely from the tank before replacing the bolt. Refill the tank
with fresh unleaded fuel.
NOTE: Fuel that has become contaminated will prevent these
engines from starting. Contamination can include water from
either condensation or from water that has somehow got into
the storage tanks at the garage. A service dealer may be
required to clear this.
Please dispose of old fuel and used engine oil in a manner that
is compatible with the environment
Your local ServiceLink centre can be
found at www.servicelink.org.uk
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