Triumph MAYFLOWER 1951, Instruction Book

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49
RUNNING ADJUSTMENTS- Engine
the country, and a non-technical survey of the importance of good carburetion and
how to maintain it.
Fuel Pump
The fuel pump is mounted on the right-hand side of the crankcase and provides a
constant pressure of fuel to the carburettor float chamber when the engine is
running.
A hand primer is fitted which can be used to pump fuel to the carburettor if the float
chamber is not already full, under which condition a slight pumping resistance is
felt before the lever reaches its stop. This resistance ceases when the chamber is
full.
To clean the filter.
Remove the filter cover and gauze, clean out the sediment chamber, swill the
gauze in fuel and replace. Make certain that the cork washer lies flat on its
seat and makes an air-tight joint, and that the fibre washer is under the head
of the cover screw. Tighten the screw just sufficiently to ensure a fuel-tight
joint. Over-tightening will either destroy the cork or fibre washers, crack the
cover, or fracture the main casting.
If the pump fails to supply fuel to the carburettor it is advisable to attend to the
following points: (a) inspect the fuel pipe unions which, if any are loose, should be
tightened up; (b) a blockage may have been caused in the fuel pipe which may be
removed by blowing through the pipe with the aid of a tyre pump.
If, after attending to the above points, the pump still fails to operate, it should be
renewed and the old pump sent to the nearest A.C. Service Station or Standard
Service Depot.