Porsche 944 Workshop Manual page 120

24
L-Jetronic Fuel Injection
CHECKING FUEL PRESSURE
1. Slacken and remove capped nut on
test connection of fuel
distribution line.
Note:
Be careful that sealing ball does
not fall out when capped nut is
removed.
2. Connect pressure gage with hose
from pressure tester P 378 or VW
1318 to test connection.
3. Disconnect DME relay from central
electrics and jumper terminals 30
and 87 b with a length of
electric wire. Fuel pump must now
run.
24 - 104 Checking Fuel Pressure
4. Control value:
Engine stopped 3.8 +- 0.2 bar
(DME relay jumpered)
Engine idling, approx. 3.3 bar
5. Tightening torque of capped nut:
22 Nm (16 ftlb)
944
Printed in Germany