Mazda Fuel Tank Insulator

Some 2010-2015 Mazda CX-9 vehicles produced before April 1, 2015, may exhibit an unusual noise while driving.

May 14, 2021

Some 2010-2015 Mazda CX-9 vehicles produced before April 1, 2015, may exhibit an unusual noise while driving. The noise may be caused by a broken fuel tank insulator that is hanging down and contacting the propeller shaft.

The rivets may break when a load occurs. The rivet material has been changed to eliminate this concern. Raise the vehicle on a hoist and inspect the insulator for damage at the rivets. Remove the pre-silencer from the vehicle. Remove and discard the insulator from the fuel tank.

Install the new insulator with modified rivets. Re-install the pre-silencer. On 4WD models, re-connect the propeller shaft to the differential.

TK31-56-398................. rivet.................. 5

L214-42-741A................insulator 4WD....1

L206-42-741A................insulator 2WD... 1

FSB8-40-305..................gasket.................2

AJ17-40-305..................gasket.................1

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Information courtesy of Mitchell 1

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Mike Mavrigian

Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.