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Home >> Porsche >> 2019 >> 718 Boxster Base, Automatic DCT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (20 Fuel Supply, Actuator 2.5L -- 982 - BOXSTER/CAYMAN) >> WM, 200101 - Checking Fuel System (High-Pressure Side) For Leaks >> Checking Fuel System For Leaks >> Approved Test Media

Approved Test Media

WARNING: This page is about a different variant/trim than selected.
Test medium Designation Composition/purity
Helium He (gaseous, compressed)
  • 4.6 (minimum quality)
  • 5.0, etc.

not balloon gas 
  • 99.996 volume % (4.6) He
  • 99.999 volume % (5.0) He
Forming gas
  • Forming gas 5
  • 95% nitrogen N2 and 5% hydrogen H2
Leak-locating spray e.g. TEGA test spray TPS 674 Request safety data sheet
Address: Technische Gase u. Gastechnik GmbH, Werner-von-Siemens-StraBze 18, 97076 Wurzburg
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 vapours.
    • → 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.
  1. Attach warning sign -1  - in a clearly visible position on the vehicle or position it in the immediate working area.
    G14945520Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  2. Open the fuel low-pressure line at the underbody.
    1. 2.1 Open line clip -4  - and unclip line.
    2. 2.2 Place a cloth underneath the connection point -1  -.
    3. 2.3 Release lock on the plug-in coupling (pull upwards).
    G14945521Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    WARNING: Leaking fuel supply lines 
    • Emerging fuel 
    • Risk of fire 
      • → Perform leak test.
  3. Connect adapter hose -1  - to quick connector for low-pressure line.
    1. 3.1 Connect compressed air connection of filling unit to the adapter.
    G14945522Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  4. Fit pressure reducer -3  - to gas bottle connection -1  - and connect to connecting line of filling unit -4  -.
    1. 4.1 Check threaded connections on pressure reducer are seated securely.
    2. 4.2 Check that compressed air adapter is seated securely.
    3. 4.3 Screw gas bottle onto screw plug -2  - anti-clockwise by 2-3 turns.
    G14945523Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    1. Gas bottle
    2. Screw plug
    3. Pressure reducer
    4. Filling unit
    CAUTION: Test pressure is exceeded 
    • Risk of damage to high-pressure pump 
      • → The test gas test pressure must not exceed a maximum pressure of 10 bar.
      • → The setting is made at the pressure reducer.
  5. Set the test pressure on the pressure reducer to between 7 and 9 bar (corresponds to a flow volume of approx. 26 - 28 liters of test gas -arrow  -).
    G14945524Courtesy of PORSCHE CARS NORTH AMERICA, INC.
  6. Using the test gauge -1  - apply the ideal pressure to the closed fuel system.
    G14945525Courtesy of PORSCHE CARS NORTH AMERICA, INC.

    > Pressure 8 bar +/- 1 bar 

  7. Coat connections with commercially available leak-locating spray (see recommendation).
    1. 7.1 Leaks are identifiable from bubbling and can also be heard as a hissing sound.
    2. 7.2 There must be no pressure drop at the test gauge.
  8. Leaks could be caused by a damaged sealing cone, loose connections or incorrectly fitted union nuts (damaged thread), for example.
    1. 8.1 Determine causes and correct immediately.
  9. Remove test tools.
    1. 9.1 The test gases evaporate after a short time.
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