Fuel tank area soundproofing

[meowdmucker]

Before putting the engine back in was going to put dynamat on the back of the fuel tank fire wall panel but am considering packing the area around the tank with thick underlay felt to dampen sounds even more. Has anybody else done this and wondered if it was safe to do so? Thanks

 

[dubdubz]

I had my tank out recently to refurb...and thought the same.

But I rethought and decided that soundproofing should really be where I can remove it for welding. So I 've decided to sound insulate mine inside the van.

I suppose you could argue any welding done in that area would need tank out, but I'd rather be scraping bituman pad where I can get to it easily as opposed to in a confined space semi underneath!!

You should [to answer your q] be able to use bitumen type self adhesive pad and/or closed cell foam like this

http://www.woolies-trim.co.uk/c-129-sound-damping.aspx" onclick="window.open(this.href);return false;

they do the foam in strips too not shown on their website I bought some 50mm x 10mm self adhesive to replace the felt under the fuel tank retaining straps......

 

[Bookwus]

Hiya meow,

Been there, done that, kind of.

I had my tank out recently and decided to Dynamat the inside of the removable firewall. I applied Dynamat only to the recessed portions of that firewall. To apply soundproofing to the entire firwall is not needed and there is a definite space limitation in that area. The Dynamat I did put in "solidified" that firewall very nicely.

I replaced the felt on the bottom of the tank (the strips and the "doughnut" around the tank feed) and at the corners (for the strapping) with a high density foam recommended to me by a local specialist. While it does a better than original job of cushioning the tank, it made getting the tank resecured in place a bear.

Bottom line is that after the Dynamat and the the new cushioning, I really cannot tell much of a difference.

 

[Frankie]

what is dynamat made of ? :mrgreen:

 

[Bookwus]

Hiya Frankie,

Hmmmm.........good question. I'm sure the actual contents are proprietory, but the mat itself could be described as a petro-based rubber formulation. It is somewhat stiff when cold but becomes very pliable with only moderate heat. Using a hairdryer to help install makes the process pretty easy. One side is backed with adhesive so one merely cuts to fit and smacks it into place. And there are different types of Dynamat available. Take a look...............

http://www.dynamat.com/products_automotive_dynaliner.html" onclick="window.open(this.href);return false;

And it's worth noting that there are quite a few competitive products which function (IMHO) just as well and are less pricey.

 

[Milky]

I soundproofed the flooring on my Volvo Amazon years ago and it made a great difference.I used the old fashioned black bitumen sheets.

 

[Frankie]

yes I think it just looks like roofing stick on flashing think I'l eventually go this way much cheaper probably thanks.

 

[meowdmucker]

Thanks everybody, I'll use the dynamat inside the tank area and inside the rear of the van and report any conclusions as to its effectiveness.