Check Inlet Valve; Check Outlet Valve; Check Diaphragm; Check Oil Seal - Volkswagen Taro 1989 Workshop Manual

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Prechecks
1
Before petforming the following checks on the fuel pump
(a) Run some fuel through the pump to ensure that the check
valves seal tlghtiy (a dry check valve may not seal properly)
(bl
E)
l n o n 0 ocrmg off
an{
p pes operale the pump lerer ana
L W C ~
lne amo. nt ol lorce necersan, tor upcral on and tne
amount ol arm play
T h
s
same a m o m ol l o r w sno"
a
oe
used In the checks
1.
Check inlet valve
Block the outlet and return pipes with your finger and check
that there is an lncrease m lever arm play and that the lever arm
moves freely
(1)
(no reaction force)
I
2. Check outlet valve
Block the inlet plpe with your finger and check that the arm
locks
(2)
do not operate wnh same amount of force used
I"
the precheck above
NOTE Never use more force than that used in the precheck
This also appiles to checks
3
and 4
3.
Check diaphragm
Block the Inlet, outlet and return plpes and check that the
pump arm locks (3)
NOTE If all three of these checks are not as specd~ed, the
sealing at the body and upper casing is defect~ve
4.
Check oil seal
Block the vent hole wth your finger and check that the pump
arm locks (4)