DefenderWorx Mustang Locking Fuel Doors User Manual

2010 + Mustang Locking Fuel Door

Installation Instructions

Part #’s: 900708, 900709, 900710, & 900711

DO NOT SMOKE or HAVE AN OPEN

FLAME while Installing this product!

Tools Needed:

9/32 Socket or Box Wrench 1/8 Allen Wrench
Flathead Screwdriver or Plastic Prybar 2” Masking Tape

Step 1:

Tape around opening to protect
your Mustang from any damage
when you remove the factory door
or if you mishandle any tools

around the opening.

Made in the USA!

Step 2:
Open Factory door and remove 9/32

bolts in 2 locations. These are
noted in the picture where we have
our socket and the arrow.

Step 3:
Remove factory rubber

housing by using a plastic
prybar or flat head
screwdriver covered in
masking tape or with a thin
rag. Notice the locations that
are being pried upon. These

need to be pulled out away

from the body so the factory
fuel door can be removed.

Step 3 B:
Once you pry the housing up,

you will need to pull the rubber
housing out of the body of the
car. The housing surrounds
the filler tube and needs to be
pulled away to expose the
areas for your fuel door to be
installed. It did take some

effort to pull it away. This step

took about 3-4 minutes just
mainly as we were being
careful not to damage the
vehicle.