Porsche 912 E - Page 73

CHECKING FUEL PUMP DELIVERY RATE
1. Loosen adapter hose clamp and pull adapter
off of air volume control.
2. Detach fuel return line in engine compartment
and loosen clamp.
3. Turn on ignition.
Printed in Germany
Fuel System
20
4. Hold end of fuel return line in a measuring
glass (approx
1000 cc) and open flap by hand
until the pump delivers fuel. Let fuel run
into glass
for 30 seconds.
5. Release flap after 30 seconds. Flap closed,
pump
contact breaks and pump stops delivering
fuel.
6. The amount of fuel must be at least 500 cc.
Note
Check the fuel pump current draw if the
amount of fuel does not meet specifications.
Replace fuel pump
if necessary.
Fuel Pump Test Specifications
The fuel pump delivery rate for testing is
500 cc at 30 seconds and 12 volt nominal.
Nominal voltage
Operating voltage
Current draw
Operating pressure
=
=
12 v
7 - 15 v
Max. 4.5 A
Max. 2.5 (35psi)
Checking Fuel Pump Delivery Rate
20 ,- 3