Porsche 928 Workshop Manual page 389

24
LH-Jetronic
928
4. If fuel pressure deviates from specified
TEST POINT 11
values, slowly squeeze return line with a
clamp applied at rear next to the fuel level
transmitter.
Alternator/Regulator
Peak voltage of the alternator could cause
engine misfiring.
1. Remove drive belt and alternator.
2. Start engine. If misfiring is eliminated,
check alternator and regulator.
l
If pressure rises to less than 4 bar, check
fuel filter or, if necessary, replace fuel
pump.
5. If engine cannot be operated, pull off
relay XVII and bridge terminals 30 and
87.
Fuel pump must run.
Specification: 2.3. 2.7 bar
0
24-120 Troubleshooting LH-Jetronic
Printed in Germany