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Anyone ever put foam in their fuel tank?

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Category: CJ-2A Discussion Area
Forum Name: General Discussion
Forum Description: General talk about the CJ-2A
URL: https://www.thecj2apage.com/forums/forum_posts.asp?TID=49981
Printed Date: 28 Mar. 2024 at 4:34pm
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Topic: Anyone ever put foam in their fuel tank?
Posted By: Mark W.
Subject: Anyone ever put foam in their fuel tank?
Date Posted: 12 Sep. 2021 at 9:22pm
I been thinking about the problem of fuel sloshing out of the filler neck when going around a right hand turn after filling the tank.

And I got to thinking about the foam that is put in race car fuel tanks to stop sloshing and as a safety to keep fuel from splashing in a wreck.

And I wondered if a person put a cylinder of this foam in the filler neck would help keep fuel from sloshing out. I have figured out a way to hold it in place and make it easily removable for refueling. As it would drain out of the foam as the tank level goes down barring it retaining fuel when it is pulled out (making a mess) I think it would have to help.

Soon as I come up with a couple other things to add to my next Summit racing order to spread the cost of shipping I'm going to try it.

Oh and I should say I have a Vintage Stant Locking gas cap on CHUG so its vented no matter what LOL.


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Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962



Replies:
Posted By: nofender
Date Posted: 14 Sep. 2021 at 5:08am
I don't have any first hand experience. But I've heard nightmares. Over time the foam starts to break down and clog up fuel systems. Make up of the foam may have changed over the years and eliminated that issue. But I always avoided foam for that reason. 

These are pricey - but in my opinion do a mush better job! baffle balls. 

https://www.tank-depot.com/productdetails.aspx?part=EP-AVB195&gclid=EAIaIQobChMIycL1vY7-8gIVrdSzCh2AsQ7rEAsYASABEgIqdfD_BwE" rel="nofollow - https://www.tank-depot.com/productdetails.aspx?part=EP-AVB195&gclid=EAIaIQobChMIycL1vY7-8gIVrdSzCh2AsQ7rEAsYASABEgIqdfD_BwE




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46 CJ2a rockcrawler
46 CJ2a - 26819
46 Bantam T3c "4366"
47 Bantam T3C - 11800
68-ish CJ5


Posted By: Downs
Date Posted: 14 Sep. 2021 at 8:06am
When I still worked on helicopters and airplanes for the Marine Corps fuel foam was a common thing.  Helped with sloshing and helped keep the fuel from atomizing in an accident or combat damage, reducing fire risk.  Came in blocks and had to get installed in the tanks like a puzzle lol. 


Posted By: Mark W.
Date Posted: 14 Sep. 2021 at 9:10am
The baffle balls would not work unless they were available in a different size as the tank is only 6" deep the balls shown are 7.5"

The foam I am looking at is rated for E85 fuel and like many other things would need to be replaced before any desegregation happens. I this case about every two years is recommended. And I wouldn't be filling the tank only placing a short cylinder of the foam in the filler neck.


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Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962


Posted By: oldtime
Date Posted: 14 Sep. 2021 at 9:42am
I don’t see that foam will cure the problem. That will only slow down the leakage.
The real problem is that a full tank will drip out the neck anytime and every time the Jeep is positioned with the neck downhill.
Even if you have a tight fitted cap it will seep out the neck  if parked downhill long enough. That will surely eat at the paint on the drivers side of Jeep if it is not 2K.
Obviously having a tank cap with a poor gasket only increases the speed at which it leaks.
The only solution
Is to fully seal the cap on the neck with a non vented cap or a remotely vented cap (vented via long hose) 


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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts



Posted By: drm101
Date Posted: 14 Sep. 2021 at 1:11pm
I had a problem with fuel spilling out and found that replacing the rubber gasket and bending the tabs on the cap took care of it. It seals up fine now. My only issue is that after running for an hour or so the tank will be in a vacuum and pop when the tank collapses slightly. No problems with the way it runs or anything, it just scares me sometimes when it pops. After reading the manual I realized that the valve on the cap works to hold a small vacuum, and also release pressure. 
It says the pressure valve opens at 1 1/2 to 2 1/2 psi, and vacuum valve opens at 3/4 psi. 




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Dean
'47 CJ2A "Mud Hen"
The less the Power the More the Force


Posted By: outlw21
Date Posted: 14 Sep. 2021 at 11:21pm
what are you going to do with the fuel sender float?


Posted By: Mark W.
Date Posted: 15 Sep. 2021 at 8:03am
Not that the sender unit is in the FUEL FILLER NECK. But that wouldn't matter as the sender unit I am using does not use a float or any other moving parts.


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Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962


Posted By: jeeper50
Date Posted: 15 Sep. 2021 at 3:05pm
Put some in and report your findings, I'm kinda curious to find out

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Belleview ol skool winch soon.
'48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers

Texan at heart,Alabama by retirement



Posted By: JeepFever
Date Posted: 15 Sep. 2021 at 11:27pm
Originally posted by drm101 drm101 wrote:

I had a problem with fuel spilling out and found that replacing the rubber gasket and bending the tabs on the cap took care of it. It seals up fine now.  . . . After reading the manual I realized that the valve on the cap works to hold a small vacuum, and also release pressure. 
It says the pressure valve opens at 1 1/2 to 2 1/2 psi, and vacuum valve opens at 3/4 psi. 

I think my '46 has original cap.  Fuel spillage has never been an issue while moving.  It did start leaking several years ago when parked off-camber,  full tank,  driver-side down.  . . .  but after replacing the gasket it is back to "almost" never leaking.    

The only time it leaks is when the tank is full,  parked with driver side down,  (for a fairly long time),  and the temp rises significantly after parking.   (pressure must go above the 1.5/2.5 psi mentioned above)  

The stock cap design seems to work good,  but does not lock.   If locking is requirement,  then it will be interesting to see how the foam works on the road with that cap.    It does not seem that foam in the filler neck, would help  ->  if parked driver side off-camber,  full tank,  using a open vented cap.
 


Posted By: Jw60
Date Posted: 17 Sep. 2021 at 8:18pm
Issue I see is the foam must flow fast enough to fill the tank and to do that it will flow fast enough to dribble. To me the solution would be a well sealed cap and a seperate vent tube or a fill tube that crosses to the far side of the tank in such a way that fuel can no longer be forced up the filler neck.


Posted By: cal.bar
Date Posted: 18 Sep. 2021 at 11:41am
I don't suppose just not filling your tank to the brim would resolve this?  I've never noticed any leaking as described, just don't fill it up too much.



Posted By: Mark W.
Date Posted: 18 Sep. 2021 at 4:25pm
dId anyone actually read my original post?


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Chug A Lug
1948 2A Body Customized
1949 3A W/S
1957 CJ5 Frame Modified
Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962


Posted By: cal.bar
Date Posted: 18 Sep. 2021 at 11:15pm
Originally posted by Mark W. Mark W. wrote:

dId anyone actually read my original post?

Yes, I read it.  I took it to mean that your tank leaks when you fill it and go around a turn.  Please feel free to be more specific about the issue and your musings and we can answer accordingly.



Posted By: Ron D
Date Posted: 18 Sep. 2021 at 11:31pm
Or just go ahead and do it and then tell us how it worked?


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1951 M38
1951 M100


Posted By: Steelyard Blues
Date Posted: 19 Sep. 2021 at 8:07pm
How about trying one one of these? 
https://www.ebay.com/itm/164101628523" rel="nofollow - 1955-1959 Chevy Truck Gas Tank Fill Tube Baffle | eBay

Micah


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1947 CJ2A 106327, Engine J109205, Tub 97077. Luzon Red

https://www.thecj2apage.com/forums/steelyard-blues_topic41024_post397981.html?KW=micah+movie#397981

1965 Johnson Furnace Company M416 #6-1577


Posted By: Ol' Unreliable
Date Posted: 19 Sep. 2021 at 11:51pm
What I have always found strange about the gas leakage is that you almost never get to park your Jeep with the gas filler uphill.  At least, I rarely get to park that way.  And the fuller the tank is, the more likely it is that you'll park listing to port.  Gotta be "Murphy's Law" kinda thing.

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There's a reason it's called Ol' Unreliable


Posted By: Oldpappy
Date Posted: 20 Sep. 2021 at 12:15pm
I never have thought about putting foam in the tank, but I once bought a 58 Chevy pickup from an old guy who told me the battery would last forever because he had put pink dishwashing detergent in it.

The battery went dead a week after I bought the truck, and I found out later that the old guy went to the "nervous hospital" as Carl would have said.


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If you can't get there in a Jeep you don't need to be there!


Posted By: Jw60
Date Posted: 21 Sep. 2021 at 10:04pm
I done good in school soo well they kept me. I did miss the part of pulling the foam out to fill the tank. It's just that the foam only slows sloshing in the same manner as the labyrinth inside the vented cap, so what defeats one defeats the other. They do make non vented caps and you can run a vent off of the top of the filler neck and up as high as you can so only a flop allows fuel to exit.



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