Fuel Line Pressure Inspection

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 "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION .)
Remove the battery cover. (See BATTERY REMOVAL/INSTALLATION [LF] .)
Disconnect the negative battery cable.
Disconnect the quick release connector (in the engine compartment). (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION .)
Turn the lever of the SST parallel to the hose as shown in Fig 1 .

Fig 1: Inserting SST Quick Release Connector Into Fuel Pipe Until Click Is Heard
Courtesy of MAZDA MOTORS CORP.
Insert the SST quick release connector into the fuel pipe until a click is heard.
Verify that the quick release connector is firmly connected by pulling it by hand.
Start the fuel pump using the following procedure:
Using WDS or equivalent
1. Connect the negative battery cable.
2. Connect the WDS or equivalent to the DLC-2.
3. Start the fuel pump using the "FP" simulation function.
  
  Fig 2: Locating DLC-2 Connector
  Courtesy of MAZDA MOTORS CORP.
Not using WDS or equivalent
1. Short the check connector terminal F/P to ground using a jumper wire.
  
  Fig 3: Checking Connector Terminal F/P To Ground Using Jumper Wire
  Courtesy of MAZDA MOTORS CORP.
  
  Fig 4: Identifying F/P Connector Terminal
  Courtesy of MAZDA MOTORS CORP.
2. Turn the ignition switch to the ON position to operate the fuel pump.
Operate the fuel pump for 10 s .
Measure the fuel line pressure.
- If not within the specification, inspect the following:
  If it less than the specification:
  - Fuel pump unit
  - Fuel line leakage
  If it exceeds the specification:
  - Fuel line clogging
Fuel pressure (Reference)

350-410 kPa {3.57-4.18 kgf/cm ² , 50.8-59.4 psi}
Stop the fuel pump using the following procedure:
Using WDS or equivalent
1. Stop the fuel pump using the "FP" simulation function.
Not using WDS or equivalent
1. Turn the ignition switch to off to stop the fuel pump.
Measure the fuel hold pressure after 5 min .
- If not within the specification, inspect the following:
  - Fuel line for clogging or leakage
Fuel hold pressure (Reference)

250 kPa {2.55 kgf/cm ² ,36.2 psi} or more
Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION .)
Disconnect the SST .
Connect the quick release connector to the fuel distributor. (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION .)
Complete the "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION .)