Porsche 928 Workshop Manual page 444

928
CIS Fuel System
25
CHECKING CONTROL PRESSURE "COLD"
Note
3. Pull wire plugs off of control pressure regulator
co prevent overhearing.
Engine must be cold for this rest. which is abso-
lutely essential for cars experiencing starting
and/or warming-up problems. Do nor use car for
several hours, at best overnight. 4. Bridge fuel pump relay socket terminals
30 and 87.
If rhe control pressure regulator is vacuum controlled.
rhe charts will only show values for rhe ~acwm rest
method.
1. Connect and bleed pressure rester P 378. ser
switching valve ar position 2.
5. Produce specified vacuum with the hand vacuum
pump. or adjust (see Testing and Adjusting
Specifications).
2. Pull vacuum hose off of control pressure regu-
later and connect extra hose and hand vacm~m
pump US 8026 to connection of conrrol pressure
regulator.
6. Refer IO diagram underneath Testing and Ad
justing Specificarions for nominal pressure
agreeing with actual ambient temperature.
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Printed inGermany - Iv, 1980
Checking Control Pressure
"Cold"
25 - 12 a