Briggs & Stratton 500 Series Maintenance Manual page 12

Engine Model: Briggs & Stratton
B: Fuel:
Ensure there is at least a third of a tank of fresh fuel, and the mower is
standing on level ground. The fuel feed pipe only goes down
fuel to avoid picking up sediment.
Push the primer bulb at least three times. You should hear petrol squirting into the
engine and feel some resistance to your finger as you press the primer button.
NOTE: Over the winter period it sometimes happens that mice chew a hole in the
rubber primer bulb! Your mower will not start in these circumstances. See Section 6,
sub-section B - Replacing the Primer Bulb, or refer to a service dealer.
When starting from cold (or for new engines) it may be necessary to prime the engine
eight to ten times continuously to bleed the fuel system of any air pockets.
If you do not hear petrol squirting into the engine, or feel no resistance to your finger
as you press the primer button, check there is at least a third of a tank of fresh petrol.
Again prime the engine. If there is still no evidence of petrol being fed to the engine
there may be an air lock.
Remove the air filter assembly from above
the primer bulb. It is held by a long screw
(flat bladed screwdriver required). Once the
screw has been removed, lift the air filter
assembly about 5mm and draw it from
underneath the engine cover.
VENTURY VIEW POINT
Check the level of fuel in the tank and top up if necessary. Then again check to see
if the jet of fuel shoots across the ventury. If it doesn't, carry out the following
instructions:
Page 12 of 32 B&S Classic, 450 and 500 Series Selfhelp
Classic,
450 and 500 Series
Look down into the carburettor ventury (the
aperture that is revealed once the filter is
removed, about 40mm in diameter). Press the
primer bulb several times to check that a jet of
fuel shoots across the ventury from behind the
primer through to the engine cylinder.
If no fuel shoots across it will indicate that either
there is insufficient fuel in the tank or you have
an air lock.
2
/ of the way into the
3
Guide 2011, Issue 1.0