Lotus TURBO ESPRIT Service Manual page 409

SECTION LD Page 37
The nominal control pressure should be read from the curve i n accordance with the
air pressure.
The effect of the altitude compensation begins a t an air pressure of about
933
rnbai,
i
.e. starting at about
600
m. A t higher altitudes i t i s essential that the exact air
pressure i s known o n the day when the measurements are made. (Use a n ac,curate
barometer, or ask the weather bureau or an airport i f one or the other i s near and
a t the same altitude).
bar
kgf/cml
ffl
Time taken to achieve Warm Control Pressure
(at
20°C
and
944
mbar)
Time
(
sec.
)
Effect of Altitude on Warm Control Pressure
800 750 700 650
600
550
Torr
1067 1020 933
867 800 733 mbar
Air pressure
If the control pressure does not rise from the cold setting, check the feed and earth
connections at the warm up regulator.
If
warm control pressure
i s
outside specification, replace warm-up regulator.
6 .
Check for Fuel System Leaks, Internal
&
External
With the fuel pumps running, carry out a thorough visual inspection of al.1 fuel
system connections.
With the test gauge fitted as in(4) and with the gauge valve open, start
engine and switch off when 'warm' control pressure i s reached. Observe and
record the drop i n pressure with time.
Specification: Minimum
3.0
Bar after
30
mins.
I f the pressure drops too quickly, repeat the test, closing the gauge valve as the
engine i s switched off, thus isolating the control pressure circuit.
If the same result
i s
found, the leak i s i n the, primary pressure
circuit.
If
however,
the second result i s within specification, the..leek
k,'tn
the control pressure circuit.
Possible causes of primary pressure leak:
.
.
i)
Non return valve i n secondary fuel pump. Replace pump.
.
i i )
Leak from cold start valve or fuel injector. (see Section
D
&
G).
...
111)
'0'
ring i n primary pressure regulator leaking.
Replace
'0'
ring.
i v ) Fuel accurnulaior leaking past diaphragm. Replace.