Fuel Leakage Inspection

Using M-MDS 

1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON (engine off).
3. Using the simulation function "FP", start the fuel pump. (See ON-BOARD DIAGNOSTIC TEST .)
4. Verily that there is no fuel leakage from the pressurized parts.

   Standard 

   There shall be no leakage after 5 min.

5. In the case of fuel leakage, replace the following components and then recheck using the fuel leakage checking procedure.
   • If there is leakage, replace the fuel hoses and clips.
   • If there is damage on the seal on the fuel pipe side, replace the fuel pipe.

   Without using M-MDS 

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
2. Remove the fuel pump relay.
   Fig 1: Removing Fuel Pump Relay

   Courtesy of MAZDA MOTORS CORP.
   CAUTION:

   • Short the specified terminals because shorting the wrong terminal of the relay and fuse block may cause malfunctions.
3. Using a jumper wire, short fuel pump relay terminals C and D in the relay and fuse block.
   Fig 2: Short Fuel Pump Relay Connector Terminals

   Courtesy of MAZDA MOTORS CORP.
4. Connect the negative battery cable and operate the fuel pump. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION .)
5. Verily that there is no fuel leakage from the pressurized parts.

   Standard 

   There shall be no leakage after 5 min.

6. In the case of fuel leakage, replace the following components and then recheck using the fuel leakage checking procedure.
   • If there is leakage, replace the fuel hoses and clips.
   • If there is damage on the seal on the fuel pipe side, replace the fuel pipe.