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> Fuel Tank Pads:, Product Recommendations
Rand
post Aug 9 2018, 02:33 PM
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QUOTE
I guess I'm going with the assumption that it will get wet


This raises a question. Why should that area get wet??? Do you have leaks? Maybe it's more about what absorbs moisture. If you have water getting in there, that's another problem. Seriously, it's about what TRAPS moisture. Which felt does and neoprene does not.
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bbrock
post Aug 9 2018, 04:29 PM
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QUOTE(Rand @ Aug 9 2018, 02:33 PM) *

QUOTE
I guess I'm going with the assumption that it will get wet


This raises a question. Why should that area get wet??? Do you have leaks? Maybe it's more about what absorbs moisture. If you have water getting in there, that's another problem.


Actually, my car sat outside for over 20 years with rotten trunk seals and when I pulled the tank out, the pads were dry as a bone and no sign of damage on the tank. Curious because everything else on the car had rusted. But as I said before, the one thing might be condensation. A metal tank full of cool liquid sitting in cool humid air would likely condense on the surface and get absorbed by the felt. Other than that, I agree, the pads shouldn't get wet if seals are in good shape.

QUOTE

Seriously, it's about what TRAPS moisture. Which felt does and neoprene does not.


This is what I am challenging. Yes, felt will absorb water and trap it against the metal. No question. Neoprene will not absorb water inside the material, but if you have a piece of rubber pressed tightly against a smooth metal wall, you likely create a micro-space where water will be drawn in through capillary action. Capillary action is powerful enough to pull water from the ground to the top of a 300 ft. redwood. Once the water is in there, the properties of the neoprene work against you because there is no air present to evaporate the water. It is trapped against the tank to do its damage. The physics say it is at least a good possibility. I think the Scotch Brite pad idea is a really good one. Best of both worlds. Nothing to absorb moisture and plenty of air to evaporate any air that does find its way in before it causes damage.
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raynekat
post Aug 9 2018, 04:41 PM
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Wow Brent....that's a lot of science. I think my head just exploded. Nice one.
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Rand
post Aug 9 2018, 05:01 PM
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Here's another perspective. We know the felt just holds moisture. So cleaning things up and using a fresh less-absorbent material will get you through at least the next 30 years or so. (IMG:style_emoticons/default/wink.gif)
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bbrock
post Aug 9 2018, 08:20 PM
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QUOTE(Rand @ Aug 9 2018, 05:01 PM) *

Here's another perspective. We know the felt just holds moisture. So cleaning things up and using a fresh less-absorbent material will get you through at least the next 30 years or so. (IMG:style_emoticons/default/wink.gif)


Roger that (IMG:style_emoticons/default/thumb3d.gif) and agree that neoprene is probably better than the original felt.
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ClayPerrine
post Aug 9 2018, 08:34 PM
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Just glue the neoprene to the tank. That way it won't trap moisture between the tank and the neoprene.

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marksteinhilber
post Aug 10 2018, 11:34 AM
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QUOTE(ClayPerrine @ Aug 9 2018, 07:34 PM) *

Just glue the neoprene to the tank. That way it won't trap moisture between the tank and the neoprene.



I agree with Clay! My tank and well were rusted in way of the felt pads due to condensation, not rain. The ends where the curved rubber spacers were located were perfect suggesting impervious rubber might have an advantage. But solid rubber might squeak unless lubricated or neoprene has less tendency to do this. I used Neoprene wetsuit material as it does not absorb or internally wick moisture. As for the interface micro-wicking minutia, if you glue the neoprene to either face so it is sealed and POR-15 the steel on the tank or the support areas where the felt had been, it should be better than new and good for another 50 years. Good enough for me anyway.

Sorry, no pictures, I'm impatient and usually working too fast to pick up the camera while I'm in the middle of a task. Seems I don't get pictures during, but after when everything is closed up and not visible. Maybe that's why my car is not on jack stands even though it is still a work-in-progress.
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ValcoOscar
post Aug 10 2018, 12:48 PM
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QUOTE(Larmo63 @ Aug 8 2018, 06:54 PM) *

I used old wetsuit material (neoprene) when my tank went back in.....

https://www.youtube.com/watch?v=RdNEEzlR4pk


Larmo-

NICE tutorial ...Is that your old VW bug in the background?


You're a bad boy (IMG:style_emoticons/default/chair.gif)

Oscar
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914Toy
post Aug 10 2018, 01:33 PM
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I used Scotch pad, which I guess will not wick.
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ConeDodger
post Aug 10 2018, 01:43 PM
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QUOTE(Larmo63 @ Aug 9 2018, 04:45 PM) *

A) My trunk doesn't leak
B) My car is garaged
C) I don't drive my car in the rain
D) It doesn't rain in California anymore, anyway
E) I have plenty on old wetsuits, we live at the beach
F) I don't ever wash my car with water
G) My car is a driver
H) I don't really care


Most of these apply to me as well. I care though. I’d have to guess that between the 25 years the original owner had it on jack stands in a garage and the time I’ve owned it, my car has only occasionally been really wet during its first five years. The original felt pads were fine when I restored the tank so back they went.
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914_7T3
post Aug 10 2018, 10:31 PM
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QUOTE(Rand @ Aug 9 2018, 01:33 PM) *

QUOTE
I guess I'm going with the assumption that it will get wet


This raises a question. Why should that area get wet??? Do you have leaks? Maybe it's more about what absorbs moisture. If you have water getting in there, that's another problem. Seriously, it's about what TRAPS moisture. Which felt does and neoprene does not.



My car spent most of its life in the PNW specifically Portland/Seattle and was for the most part rust free.

When the tank was pulled it had enough corrosion to open up some pin holes upon media blasting prior to powder coating.

This is what I was dealing with. Whatever caused it, I have no idea.

Attached Image

Here is what it looks like after paint.

Attached Image
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914_7T3
post Jan 7 2019, 10:46 PM
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Wanted to update this thread with the chosen solution:

Black Foam Padding, Rubber Sheet
Self Adhesive Weather Strip Rubber Cutting Mat Insulation
Closed Cell Foam
12" X 8" X 1/4"
by MAGZO available on Amazon



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injunmort
post Jan 8 2019, 02:37 PM
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I used an old inner tube cut to size, doubled up and glued with Permatex adhesive. no problems with moisture or rubbing.
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amfab
post Jan 8 2019, 03:35 PM
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amfab
post Jan 8 2019, 03:35 PM
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amfab
post Jan 8 2019, 03:36 PM
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what about 3M Nomad mat material

This Stuff:

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Chi-town
post Jan 8 2019, 05:54 PM
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10% Ethanol gasoline is hygroscopic (will absorb water) and can absorb 50 times more water than conventional non-alcohol gasoline.

With that being said if you are not using a nitrile lined hose in your fuel system under the tank the the fuel/ethanol weeping through the natural rubber will attract moisture in the fuel tank compartment which will condense at some point or another.

Another issue is condensation on the outer tank itself when the cooler fuel in the tank meets a humid day. I think may actually be the biggest culprit.

As for material to make the pads, I had a section of self adhesive rubber that I cut up and used.
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iankarr
post Jan 8 2019, 07:47 PM
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My gas tank compartment has actually been a mouse pad....
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saigon71
post Jan 9 2019, 11:27 AM
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I cut pipe insulation down into squares for where the tank rides.

https://www.lowes.com/pd/Frost-King-1-2-in-...ulation/1060001
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