Datsun 1000 Workshop Manual page 46

13 Fuel
System
3
Flat spot
on
acceleration
Possible
cause
a
Blocked
accelerator
pump
discharge
jet
or
sticking
check valve
b Faulty
accelerator
pump
plunger
c
Faulty
accelerator
pump
linkage
4
Engine misfires
or cuts out at
high
speed
Possible
cause
a
Obstruction in main
or power
jets
b
Low fuel
level
in
float chamber
or
float chamber
starving
for fuel
c
Failure
of
fuel pump
to
deliver sufficien
t
fuel
d
Blockage
in
fuel
tank
pipe
e
Restriction in fuel filter
f
Air leak between fuel
pump
and filter
or
between filter
and tank
g
Air leak between carburettor
air
horn
and main
body assemblies
or
main
body flange
h Water in carburettor
5 Excessive fuel
consumption
Possible
cause
a
Float level too
high
b Choke
butterfly partially closed
c
Air cleaner element
dirty
or
requires renewal
d Accelerator pump
requires
an
adjustment
or
in wrong hole in
pump
connecting
link
e
Fuel
pump
delivery
pressure too
high
f Faulty
fuel
pump
diaphragm
g
Leaks between fuel
pump and
fuel
tank
or
fuel
pump and carburettor
h Power
jet
vacuum
plunger stuck
in
release lower position
i
Faulty
power
jet
j Worn
or
damaged main
or
power jets
k Excessive
use
of choke
or
accelerator pump
Remedr
Clean and blowout carburettor
Renew pump
plunger
assembly
Check and rectify
pump
linkage
Check
that
pump
connecting link
is in
correct position
in the pump lever
Remedv
Dismantle and blowout
jets
Check float level setting check
fuel pump
filter and
supply
lines
Overhaul fuel
pump
Remove
blockage
and clean
pipe
Clean
or renew
filter
Rectify
air leak
Check and
renew
gasket
and
tighten
securing
screws
Drain and clean
fuel system
Remedy
Check
and
re
adjust float level
Check and
rectify
Clean
element
or renew
Re
adjust
accelerator
pump
stroke
with link in other hole oflever
Check
and
fit correct
diaphragm
spring adjust
fuel pressure with pump base
gasket
Overhaul fuel
pump and
renew
as necessary
Gleck and
rectify
leaks
Free
plunger
or renew
Check
and
renew
faulty jet
Check and
renew
faulty
components
Revise
driving habits
46