Fuel System - Chirp, Squeak or Cricket Sound From Engine

*NUMBER: 09-54-12R*
DATE: 10/03/12
*REVISED: 03/26/13*

APPLICABILITY:
2013MY BRZ

SUBJECT:
High-Pitched "Chirp", "Squeak" or "Cricket"
Sound from the Engine

INTRODUCTION

The purpose of this bulletin is to provide information regarding a high-pitched "chirp", "squeak" or "cricket" sound you may hear coming from the engine's high-pressure fuel pump. Not all pumps may exhibit this condition. Some may have a plunger stopper *shape which in combination* with certain fuel temperatures or fuel formulations, may result in aeration of the fuel within the body of the pump *and cause* this sound when the engine is idling. This result is non-detrimental to the fuel system or engine. *A production change was made to an internal fuel passage along with a change to the shape of the plunger stopper thus eliminating the source of the sound.* Once the sound has been confirmed, the high-pressure pump assembly must be replaced to remedy the condition.

IMPORTANT:
A "clack" or mechanical "ticking" sound may also be heard as part of the operation of the high-pressure fuel pump which is considered to be a normal operating characteristic. No attempt should be made to repair it.





COUNTERMEASURE IN PRODUCTION








PART INFORMATION

SERVICE PROCEDURE

Road test the vehicle at least 10 minutes to be sure it is up to operating temperature. Once the sound has been confirmed, follow the precautions and procedures in the applicable Service Manual for replacing the high-pressure fuel pump.

The required tool for BRZ high-pressure fuel pump removal / installation is: Socket Driver, Snap-On Tools stock# FTX40TPE, TORX(R) Plus, size 40 IP, length: 1-3/4" (see July 2012 TIPS).

IMPORTANT:
Always follow the tightening torque specifications as indicated in the applicable Service Manual (and the exploded view diagram) during re-assembly.

WARRANTY / CLAIM INFORMATION

For vehicles within warranty, refer to the Subaru Warranty Wizard(R) for claim submission information.





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