If a car stops and has not run out of petrol, check whether there is petrol in the
. If there is not, there is a fault in the
, slipping a plastic bag over the end of the line as you do so to catch any
inside. Secure the bag with a rubber
, then turn the
over with the
If fuel spurts out, there is a carburettor fault (See
Checking and cleaning an SU carburettor
). If no fuel, or only a dribble, emerges, either there is a blockage or leak somewhere in the fuel line (See
Checking fuel pipes
) or the
is not working. Some
are sealed and cannot be repaired; check to see if there are screws for dismantling.
A mechanical-pump drive hardly ever fails — though signs of wear may appear on the cam and operating
can leak. A small leak may affect the engine noticeably only at high speeds, but may also let petrol drip through into the
area and from there to the
. If this occurs, there is a risk of an explosion.
have a disc and a seating held together by a small cage. Pres- sure in one direction pushes the valve on to its seating, closing it;
the other way lifts the disc and opens the valve.