Testing; Pull Rod Removal; Static Pressure Test; Structure Of Fuel Pump - Datsun 1200 1971 Workshop Repair Manual

Fuel
Sptem
Testing
A fuel pump
IS operatIng
properly
when 1tS
pressure
IS
Within
specifications and ItS
capacIty
IS
equal
to the engine
s
reqUIrements
at
all
speeds
Pressure and
capacity
must
be determined by
two tests
With the pump mounted
on
the
engIne
Be
sure
that there
IS
gasohne
m
the
tank when
conductIng
these tests
Fig
89 Pull rod removal
StatIc
Pressure Test
The static
pressure
test
IS
conducted
as
follows
Disconnect
the
carburetor
fuel
line
at
the
car
buretor
Install the
necessary
adapter and tee
fitting
to
the fuel Ime and attach
a
SUitable pressure
gauge
Start and
run
engme at
varymg
speeds
The
readIng
on
the gauge
IS
the
static
fuel
pressure
and thIS
should
remam
wlthm the
follOWing
Itmlts
2
61b
sq
m
Pressure
below the
lower hmlt IndlCates
ex
treme
wear on one part
of
a
small
amount
of
wear on
each
working
part
They
also md1cate
a
ruptured dIaphragm
worn
warped dirty
or
gummmg valves and
seats
or
weak
dIaphragm
return
spring
Pressure above the
upper
hmlt Indicates
an
excessIVely strong dIaphragm
that
IS
too
tight
ThIS
condItIOn
reqUIres removal of the
fuel
pump
assembly
for
replacement
or
repair
I
V lvc
llllh
2 PdlklOg
3
Retamer
4
Stre
5
p
6
Ga
ket
7 Screw
8 Washer prln
9 Rocker
Jrm
10
Rocker pm
II
Ro
ker
fm pTln
12
Spdcer
13
Diaphragm assembly
14
15 Retiuner
16
Diaphragm sprtng
17 Washer
5PIlllg
18
Nul
19 Washer
plalO
20 Ga ket
21
Spacer
22
Complete
body lower
23 Connector anlet
24 Connector outlet
Fig
90 Structure of fuel pump
51