Volkswagen Type II Transporter 1200 Series Shop Manual page 66

12-Fuel
System
between the fuel pump and the carburettor by means of a
T-joint piece and with a test range 0-5.7 psi. Behind the
gauge a fuel tap is fitted in the fuel test line.
Correct adjustment of the push rod stroke and the
diaphragm spring tension determines the pump pressure.
By adding or removing flange gaskets, the push rod
stroke can be adjusted.
In case the desired result is not obtained by adjusting
the push rod stroke, renew the diaphragm spring.
Too high pump pressure can cause flooding and
dilu tjon of engine oil.
Too low pump pressure will not deliver fuel in
SCREW-~
COVER-~
GASKET
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FILTER--
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SCREW
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TOPBODv---
DIAPHRAGM--~
RETURN SPRING
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S E A L - . - e
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SEAL
RETAINER~
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. LOWER BODY
SPRING -
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PIN
ROCKER ARM
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Exploded View of Fuel Pump Components. (Typical of all
models.)
. 66
sufficient .quantity to the carburettor and the engine
performance will suffer as a result.
TO REMOVE
(1) Detach the fuel hose from the fuel pump.
(2) Using a suitable wrench, undo the two mounting
stud nuts at the flange mounting.
(3) Remove the fuel pump.
(4) Remove the push rod, intermediate flange and
gasket.
TO ADJUST FUEL PUMP STROKE
(1) For the purpose of adjustment, position the
intermediate flange, push rod and the two gaskets on the
fuel pump mounting studs. Position the push rod so that
the convex end is at the eccentric of the distributor drive
pinion.
(2) Position adjusting gauge VW328c on the fuel pump
mounting studs and on the gaskets and intermediate flange.
Screw on the two securing nuts and tighten them to the
same torque used when installing the fuel pump so that the
gaskets will be compressed to the usual thickness.
The stroke of the push rod is approximately .160"
which is determined by the eccentric on the distributor
drive shaft. The movement of the stroke should be within
the range of .2" as marked on the gauge. The marks
correspond to a length of .31 0" and .51 0" measured from
the fuel pump contact flange, including the two gaskets, to
the end of the projecting push rod. To check the fuel pump
stroke rotate the engine. The stroke can be altered, as
required, by fitting the suitabie number of gaskets. to the
intermediate flange. Less than the required number of
gaskets must not be fitted, as this could result in damaging
the diaphragm and the drive mechanism. Remove
intermediate flange and gaskets .
TO INSTAL
Installation is a reversal of the removal procedure
observing the following points:
(1) Before installing the pump, using universal grease,
fill the lower chamber of the pump.
(2) Position on the mounting studs, one gasket,
intermediate flange, second gasket and then the fuel pump
so. that the inspectior. cover of the pump is towards the left.
Screw on the securing nuts and tighten them to the
prescribed torque when the engine is warm.
(3) Connect up the fuel line and fuel hose.
NOTE: Ensure that the fuel line rubber grommet is seated
correctly in the engine front cover plate .