Fuel Line Pressure Inspection

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death and damage. To prevent this, complete the following inspection with the engine stopped.

Follow the before repair procedure and perform the fuel line safety procedure. (See BEFORE REPAIR PROCEDURE .)
Disconnect the negative battery cable.
Disconnect the engine compartment side quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION .)
Turn the lever of the SST parallel to the hose as shown in the figure.
Reconnect the quick release connector of the SST to the fuel pipe until a click is heard.
Verify that the quick release connector is firmly connected by pulling it by hand.
Connect the negative battery cable.

Fig 1: Connecting Quick Release Connector Of Special Tool To Fuel Pipe
Courtesy of MAZDA MOTORS CORP.
CAUTION:
- Shorting the wrong terminal of the check connector may cause malfunctions. Make sure to short only the specified terminal.
Ground the check connector terminal F/P using the jumper wire.
Turn the ignition switch to the ON position and operate the fuel pump.
Measure the fuel line pressure.
- If not within the specification, inspect or replace the following parts:
  If it is less than the specification
  - Fuel pump unit
  - Fuel line leakage
  If it is more than the specification
  - Fuel pump unit
  - Fuel line clogging
  Fig 2: Locating Check Connector
  Courtesy of MAZDA MOTORS CORP.
  
  Fuel line pressure
  
  375-450 kPa {3.83-4.58 kgf/cm ² , 54.4-65.2 psi}
- Disconnect the jumper wire and stop the fuel pump.
- Wait 5 min and measure the fuel hold pressure.
  - If it is within the specification, inspect the following.
    - Fuel line for clogging or leakage
  Fuel hold pressure
  
  200 kPa {2.0 kgf/cm ² , 29 psi}
- Disconnect the SST.
- Connect the quick release connector. (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION .)
- Inspect all parts by performing the AFTER REPAIR PROCEDURE .