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Home >> Porsche >> 2016 >> Cayman GTS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 247 (20 - Fuel Supply, Control -- 92A Cayenne) >> WM 206601 Checking Quantity Delivered By Fuel Pump (Cayenne S, Cayenne Turbo, Cayenne GTS & Cayenne Turbo S) >> Checking Fuel Delivery Rate (Low-Pressure Delivery Rate)

Checking Fuel Delivery Rate (Low-Pressure Delivery Rate)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Information 

If you suspect that a pump in the fuel tank is defective (particularly if symptoms include a very low fuel level), always check the sucking jet pump for dirt or blockages.

  1. Open the bonnet.
  2. Connect a charger to the vehicle battery. The voltage should be approx. 12.5 V (no rapid charging allowed because the voltage is too high!).
  3. Connect pressure gauge with stopcock tester K-Jetronic Tester VAG 1318 WE 1291  using adapter 1318/7 and connecting line connection line 9705/3  ("female" rapid-action coupling) on the side of the stopcock. On the other side of the stopcock, connect connecting line 1318/17 (A) with measuring adapter 9705  . The tool setup must be fitted with sealing rings (copper, aluminum, or plastic, etc.) between the individual components. The setup must be fully sealed.
    Fig 1: Checking Fuel Delivery Rate
    G09933351Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    1. Measuring adapter 9705  ; with rapid-action coupling => used for checking the fuel delivery rate. Generates the required counter-pressure of 2.5 bar.
    2. Adapter 1318/17 (A) from K-Jetronic Tester VAG 1318 WE 1291  ; connection to measuring adapter 9705  => used for checking the fuel delivery rate.
    3. Pressure gauge with stopcock tester K-Jetronic Tester VAG 1318 WE 1291 
    4. Adapter 1318/7 from K-Jetronic Tester VAG 1318 WE 1291 
    5. Connecting line connection line 9705/3  ("female" rapid-action coupling)
  4. Connect measuring tool to the output of the connection unit -1-  . Hold open end of hose of measuring adapter 9705  into a large measuring tub or bucket (with a volume of at least 5 liters) -2-  . The stopcock is set to flow.
    Fig 2: Connecting Measuring Tool
    G09933352Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  5. Connect the Tester and get it ready. PIWIS Tester II 9818 
    1. 5.1. The fuel pump can be activated and deactivated as follows:
    2. 5.2. [Diagnostics] => [Cayenne] => [DME] => [Drive link test/checks] => [Drive links] => [Fuel pump activation]
    3. 5.3. The fuel pump starts to deliver fuel when you press [Start].
    4. 5.4. The fuel pump stops when you press [Start] again.
  6. Activate the fuel pump and remove all air from the measuring apparatus. Ensure that the open part of the hose is securely retained in the measuring tub. Remove the rest of the pumped fuel from the measuring tub.
  7. Get a second mechanic to help perform the measurement if necessary.
  8. Have a stopwatch ready.
  9. The fuel pump must deliver at least 3 liters of fuel during an operating time of 1 minute  . Continue to measure the fuel for 20 seconds  (stopwatch). The measured result in milliliters delivered is multiplied by 3  . For example: After pumping for 20 seconds, around 1, 050 ml of fuel is measured. Multiplying the result by 3 gives a delivery rate of 3, 150 liters per minute. The pressure gauge shows a fuel pressure of 2.5 to 2.7 bar during the measurement. This pressure is generated by the counter-pressure of the pressure regulator at the measuring adapter 9705  .
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