Checking Fuel Delivery Rate

WARNING: This page is about a different car, the 2024 Porsche 911, 2023 Porsche 911, and 2022 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Highly inflammable or explosive materials

Danger of fire or explosion
→ Avoid contact with hot parts or sources of ignition.

→ Use suction to remove ignitable vapors.

→ Attach warning sign in a clearly visible position.

→ Contain leaked media using non-flammable absorbent material and put it in a container designed for this purpose for disposal in accordance with local requirements.

→ Secure collection containers/vessels to prevent them from tipping over.

WARNING: Danger of fire due to escaping fuel and hot engine components

Danger of material damage and injury
→ Only check fuel pressure and delivery rate when the engine is cold.

Information

The battery voltage must not fall below 12.5 volts during the delivery rate/pressure check.

Disconnect supply line -1 and 2- in engine compartment.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fuel low-pressure lines in engine compartment
1. 1.1 Release and disconnect plug-in coupling -3- .
2. 1.2 Catch escaping fuel and close off line connections using suitable stoppers.
Have 9705 - measurement adapter , a fuel-resistant container, a measuring cup and a stopwatch to hand for measuring.
Connect 9705 - measurement adapter-1- to the supply line using the quick connector.
Check that the quick connector is fitted securely.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Measurement adapter 9705 (similar to illustration)
Insert drain hose from the 9705 - measurement adapter into a fuel-resistant container and secure the container against tipping over.
Information
- There is no need to create a Vehicle Analysis Log (VAL).
Check fuel delivery rate.
1. 5.1 Connect the PIWIS Tester to the vehicle and switch on the PIWIS Tester .
2. 5.2 Switch on ignition.
3. 5.3 Switch off all loads, such as PCM, air conditioning.
4. 5.4 Start diagnostics.
5. 5.5 Select DME control unit.
6. 5.6 Select the Drive links/checks tab.
7. 5.7 Select the Drain tank menu item and press F12 to continue.
8. 5.8 Press F8 = Start button actuate the stopwatch at the same time.
  Measuring time: 30 seconds!
  
  Collect emerging fuel in a container you have to hand.
9. 5.9 Deactivate by pressing F8=Stop.
Pour the collected fuel into a measuring cup.
The fuel quantity must be greater than > Volume 2, 000 cm ³ .
Switch off ignition and the PIWIS Tester .
Remove 9705 - measurement adapter-1- .

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Measurement adapter 9705 (similar to illustration)
1. 8.1 Collect emerging fuel.
Connect supply line -1 and 2- in the engine compartment.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fuel low-pressure lines in engine compartment
1. 9.1 Connect and lock plug-in coupling -3- .
Switch on ignition (fuel pump is activated briefly) and visually inspect the plug-in coupling area for leaks.