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Anyone ever put foam in their fuel tank?

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Mark W. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Topic: Anyone ever put foam in their fuel tank?
    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.
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
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nofender Quote  Post ReplyReply Direct Link To This Post 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. 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Downs Quote  Post ReplyReply Direct Link To This Post 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. 
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Mark W. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post 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.
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
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote drm101 Quote  Post ReplyReply Direct Link To This Post 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. 




Edited by drm101 - 14 Sep. 2021 at 1:24pm
Dean
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Post Options Post Options   Thanks (0) Thanks(0)   Quote outlw21 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Sep. 2021 at 11:21pm
what are you going to do with the fuel sender float?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post 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.
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
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jeeper50 Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote JeepFever Quote  Post ReplyReply Direct Link To This Post 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.
 


Edited by JeepFever - 15 Sep. 2021 at 11:35pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jw60 Quote  Post ReplyReply Direct Link To This Post 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.

Edited by Jw60 - 17 Sep. 2021 at 8:20pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cal.bar Quote  Post ReplyReply Direct Link To This Post 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.

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Mark W. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark W. Quote  Post ReplyReply Direct Link To This Post Posted: 18 Sep. 2021 at 4:25pm
dId anyone actually read my original post?
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
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cal.bar Quote  Post ReplyReply Direct Link To This Post 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.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ron D Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steelyard Blues Quote  Post ReplyReply Direct Link To This Post Posted: 19 Sep. 2021 at 8:07pm
How about trying one one of these? 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ol' Unreliable Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Oldpappy Quote  Post ReplyReply Direct Link To This Post 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.
If you can't get there in a Jeep you don't need to be there
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