Toyota 3R-B 1969, Repair Manual

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5~36 F U E L S Y S T E M - Fuel Fi lt er . Fuel Pump
2. Check the body and the bowl fo r
c ra c k s , damage and deformation .
If defective, replace as n ecess ary .
A ssembly
Position the new gasket, element and
the spring c o r r e c t ly , and assemble
the bowl and the bowl bail, then tight­
en the bail nut s e c u r e ly .
F U E L P U M P
In stallation
Follow the removal p roced u res in the
r e v e r s e o r d e r .
A f t e r installation, operate the engine,
and check fo r fuel leak.
I n l e t V a lv e
fro m F u e l
S t r a i n e r
D ia p h r a g m
P u l I R o d
O u t l e t V a lv e
t o C a r b u r e t o r
R o c k e r A rm
F i g . 5-76 C r o s s Sectional V ie w of Fuel Pump G1774
Description
T h e fuel pump is of a diaphragm type, and is composed of the inlet and outlet
v a lv e s , diaphragm, r o c k e r a rm , upper and lo w e r bodies.
T h e rotational motion of the camshaft actuates the r o c k e r arm which m turn con­
v e r t s into the reciprocation of the diaphragm.
T h is diaphragm movement d r a w s the fuel into the pump, and also d e liv ers out
the fuel with specified p r e s s u r e and volume to meet the requirement of the en­
gine through the c a rb u r e to r .
T h e operation and the construction of the fuel pump on 3 R - B , 3 R - C and 5R
model engines a r e the same, but the components a r e slightly different. T h e fuel
pump on the 3 R - B and 3 R - C is not provided with the manual l e v e r .