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 .)
Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION .)
Disconnect the quick release connector (in the engine compartment). (See QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION .)
Turn the lever of the SST parallel to the hose as shown in the illustration.
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:

Fig 1: Inserting SST Quick Release Connector Into Fuel Pipe Until
Courtesy of MAZDA MOTORS CORP.

Using M-MDS
1. Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION .)
2. Connect the M-MDS to the DLC-2.
3. Start the fuel pump using the "FP" simulation function of the M-MDS.
  
  Fig 2: DLC-2
  Courtesy of MAZDA MOTORS CORP.
Without using M-MDS
1. Short the check connector terminal F/P to ground using a jumper wire.
  
  Fig 3: Locating Check Connector
  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 for clogging or leakage
  - Fuel line clogging
  Fuel pressure (Reference)
  
  375-450 kPa {3.83-4.58 kgf/cm ² , 54.4-65.2 psi}
Stop the fuel pump using the following procedure:
Using M-MDS
1. Stop the fuel pump using the "FP" simulation function of the M-MDS.
Without using M-MDS
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 leakage
Fuel hold pressure (Reference)

200 kPa {2.04 kgf/cm ² , 29.0 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 REMOVAL/INSTALLATION .)
Complete the "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION .)