Topic: 66 Fuel Tank Insulation

[21.04]

To me it does appear the insulation I've got is the same material in the photo SgI66 posted of the f/b sold on BAT. Perhaps in the future there will be more info that comes out about what these pads are and/or where they came from.  I'm planning to reach out to the original owner I bought the car from to pick his brain about the pad.

[21.04]

Just wanted to tag on to this discussion after observing another example showing a fuel tank insulation pad.  We can see this pad under the trunk mat in the photos posted in unrestored '66 section with title, "Early 66 SJ A Code GT Convertible."

[swingkid]

Here are some photos of the trunk insulation.  From this thread, it appears there have been very few to no examples of this found in other 65-66 cars yet.  I was planning to use this on my '66 HP t-bred, but I may hold this out until further discussion or evidence surfaces.  The car is so virgin original I don't see anything to suggest this car was not delivered with it.  Surely not home made.  Car has black standard interior.  Almost exactly 32.5" long, 24.5" wide and 1/2" thick.  If the trunk area became wet at all, this would have been the first thing to get tossed.  Perhaps why more have not showed up.

-Matt

I had the same underlying in my mostly unrestored 65 SJ fastback. I put it away as I was thinking it was put in later on. I am going to check if I still have it and will post some picture if I still have it

[Building 3]

To add to this discussion. I bought my December 65 Dearborn built convertible in 1977. It had the same fuel tank top insulation as 21.4 posted, or very similar to it. In 2013 I bought my October 65 Metuchen built convertible from the second owner. It had the same or similar insulation.

Both of my convertibles have the standard interior. Neither car is equipped with anything special. They are just several of many that Ford cranked out thousands of: 289 2bbl, auto trans, radio, WSW tires, tinted windshield. 

[J_Speegle]

Might help if posters that have found an insulation layer below the trunk mate would include what interior (standard or deluxe) just in case we discover that is the key.
You can just go back to your post and add the info rather than adding another post 

[swingkid]

65 San Jos? 27Q, Deluxe 62

[21.04]

Ran across 30 June '66 projected built SJ Conv std interior that sold on BAT in 2020.  Shows a photo of large section of brown insulation stuck on top of fuel tank. photo attached and link included to confirm plant and date from data plate.  https://bringatrailer.com/listing/1966-ford-mustang-206/

[Building 3]

Here's a 1965 convertible on BaT as of today, 2/29/2024. It has seven photos of the insulation/sound deadener on top of the fuel tank. it is pretty beat up, may not be original, but it's old. Looks like the ones in my 1966 convertibles.

https://bringatrailer.com/listing/1965-ford-mustang-448/

[Bob Gaines]

Here's a 1965 convertible on BaT as of today, 2/29/2024. It has seven photos of the insulation/sound deadener on top of the fuel tank. it is pretty beat up, may not be original, but it's old. Looks like the ones in my 1966 convertibles.

https://bringatrailer.com/listing/1965-ford-mustang-448/

It looks like fairly good shape to me because it is all in one piece.Yes it looks original to me.

[21.04]

+1.  Very nice example.

[21.04]

Another example of trunk insulation seen in photo T18 of the Early 66 SJ GT A code convertible -Unrestored
Picture threads.  In this example, car has deluxe interior.

https://www.concoursmustang.com/forum/index.php?topic=16692.0

[Palmer65]

I know this is an older thread, but to keep information together and shed light on the question of which cars may have received a sound absorber on the fuel tank, the Interior Factory Assembly Manuals seem to distinguish it by body style rather than interior trim level.

The 1964.5, 1965 and 1966 Interior Factory Assembly Manuals each show a fuel tank "sound absorber" in convertible models. The 1966 Interior FAM also shows them in fastbacks, as detailed below.  I don't have any later year manuals to check.

In 1964.5 (p.24) and 1965 (p.46) Interior Assembly Manuals, a drawing titled "Luggage Compartment Sound Absorber --Model C4ZB-76--" shows a fuel tank sound "absorber" secured with adhesive for Model 76 cars (convertibles).  The same drawing is used in both editions and dated 9-27-63.

In the 1966 (p.46) Interior Assembly Manual, the drawing is more crowded with 3 views but shows fuel tank sound "absorber" for Model 63 and Model 76 (fastbacks and convertibles) in separate views for each model.

Drawing Note 6 for the fuel tank sound absorber says "(C4ZB-7646402-A) ABSORBER - LUGGAGE COMPARTMENT FLOOR CENTER SOUND, FOR MODELS 63-76, SECURED WITH"[...]"ADHESIVE".

It seems clear from the views in the drawing that only models 63 and 76 have this fuel tank sound absorber, so perhaps the dash in "MODELS 63-76" in Note 6 was a typo and not meant to include any other model, like Model 65 (coupe).

The view for Model 65 (coupe) and Note 7 on that same page shows a "sound deadener" that's only for Model 65 (coupes) (C6ZB-651168). It is shown on the elevated trunk floor, closer to the back seat floor area. No mention of adhesive with it.

[J_Speegle]

I know this is an older thread, but to keep information together and shed light on the question of which cars may have received a sound absorber on the fuel tank, the Interior Factory Assembly Manuals seem to distinguish it by body style rather than interior trim level.

The 1964.5, 1965 and 1966 Interior Factory Assembly Manuals each show a fuel tank "sound absorber" in convertible models. The 1966 Interior FAM also shows them in fastbacks, as detailed below.  I don't have any later year manuals to check.

In 1964.5 (p.24) and 1965 (p.46) Interior Assembly Manuals, a drawing titled "Luggage Compartment Sound Absorber --Model C4ZB-76--" shows a fuel tank sound "absorber" secured with adhesive for Model 76 cars (convertibles).  The same drawing is used in both editions and dated 9-27-63.

In the 1966 (p.46) Interior Assembly Manual, the drawing is more crowded with 3 views but shows fuel tank sound "absorber" for Model 63 and Model 76 (fastbacks and convertibles) in separate views for each model.

Drawing Note 6 for the fuel tank sound absorber says "(C4ZB-7646402-A) ABSORBER - LUGGAGE COMPARTMENT FLOOR CENTER SOUND, FOR MODELS 63-76, SECURED WITH"[...]"ADHESIVE".

It seems clear from the views in the drawing that only models 63 and 76 have this fuel tank sound absorber, so perhaps the dash in "MODELS 63-76" in Note 6 was a typo and not meant to include any other model, like Model 65 (coupe).

The view for Model 65 (coupe) and Note 7 on that same page shows a "sound deadener" that's only for Model 65 (coupes) (C6ZB-651168). It is shown on the elevated trunk floor, closer to the back seat floor area. No mention of adhesive with it.

Unfortunately in this case it appears that the Assembly Manuals do not match what the plants did. This could be because the page was updated or changed before it reached the car plants or the application was for a very short time. Not the first example of where the Assembly Manuals didn't match what the car plants did on the cars produced.  For 65-66 most of the Mustangs and Shelbys I've seen or owned since 73 didn't have a mat under the rubber trunk mat.

Don't typically see sprayed adhesive sprayed on cars with rubber floor mats in my experience. Those mats are not as flexible nor move around as much as the later fiber based mats. Will tyr and look though the thousands of pictures and examples to see if I can find examples of the adhesive and share since this topic as been awaken 

[Palmer65]

Don't typically see sprayed adhesive sprayed on cars with rubber floor mats in my experience. Those mats are not as flexible nor move around as much as the later fiber based mats. Will tyr and look though the thousands of pictures and examples to see if I can find examples of the adhesive and share since this topic as been awaken 

Thanks for all that you do, Jeff.
Just to be clear, the adhesive mentioned is not for the rubber mat and larger trunk area.  It is for the sound absorber that is shown on just the fuel tank area.
In this older 2012 thread a well known member reported that both his June '65 Dearborn cars had jute mats and "No tar or backing at all. Just a couple of dabs of yellow glue to hold it in place."      https://www.concoursmustang.com/forum/index.php?topic=4271.0
I'm including that to hopefully narrow your search efforts.  Thanks again.