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View Full Version : cork floats on gas sending unit----fix ????



bradnree
12-16-2006, 11:31 AM
I have the sending unit removed from a gas tank in a '52 Commander and it has two cork floats. One is shedding which will mean a plugged lind later. What is the fix ??? Thanks....Brad

Jerry Johnson
12-16-2006, 11:48 AM
Brad, I don't know the fix, but just got a NOS sending unit from Dan Peterson and I can tell you that it looks like just ordinary cork round plugs about 3/4 inch in dia. (two of them). However, they are covered with some type of sealer, almost looks like clear coat, but I am sure it's not that. The unit I got from Dan was for a 51 Champion, but am sure it fits several tanks applications. This one is the zero to one hundred ohm one.

Regards,
Jerry

64V-K7
12-16-2006, 12:38 PM
wine corks are 3/4 in diameter :-)

JDP
12-16-2006, 12:48 PM
My local hardware stock corks, but you'd need to seal them with some sort of fuel proof sealer. Most restorers dip the cork float in a can of shellac to seal it.

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JDP
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DilloCrafter
12-16-2006, 03:16 PM
JDP gave you the biggest clue. I've read that the original corks were coated with shellac to keep them impervious and "floatable".

However, if any of you is a woodworker, you may know what solvent is used to cut shellac. Unfortunately, it's a solvent that is now found in much gasoline - ALCOHOL.

So, coating corks with shellac is no longer a good idea. What I did, when I was thinking of re-using my old sending unit was to order some gas tank sealant from POR-15. I thought I would need it in my tank, and I also used it to coat the original cork. It "test-floated" very well in water, so that POR-15 or some other brand of gas tank inner sealant paint/coating might be the answer.

http://rocketdillo.com/studebaker/misc/images/Avacar-hcsdc.gif[/img=left]DilloCrafter

1955 1/2 Ton Pickup
[i]The Red-Headed Amazon
Deep in the heart of Texas

tstclr
12-16-2006, 03:40 PM
What about that "plastic dip" you can buy for coating tool handles? That might work.
Todd


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bradnree
12-16-2006, 05:20 PM
I did a search on this site "cork float" and came up with Por-15 because the new fuels cut shellac....It seems brass or plastic might be better and there was reference to Summit for sending units..Brad

Jerry Johnson
12-16-2006, 06:34 PM
Brad, I went out to the shop and measured the corks on the NOS sending unit I just purchased (525548). I don't have a parts manual for you car, so you will need to check and see if it uses this sender. The cork material is 1 1/4 inch in dia. and 1 1/2 inch long (two required). As was mentioned before it looks like these are currently covered with shellac. Now I am wondering if I need to cover them with some other type of sealer[?][?] Oh no another thing to worry about:(:(

DilloCrafter
12-16-2006, 06:42 PM
Yep, Jerry. Most shellac sold comes as flakes, to which you add alcohol to dissolve it into a usable liquid form. It may not be long before all gasoline has at least some alcohol in it.

Brad, if you go the Summit route, you'll have to see if they have the kind of sending unit for the older, 6v vehicles. Yours will have a 0-100 ohm range, whereas their replacement 12v unit (and all 12v units used on Studebakers) have a 240-33 ohm range, going in the opposite direction from the 6v cars.

http://rocketdillo.com/studebaker/misc/images/Avacar-hcsdc.gif[/img=left]DilloCrafter

1955 1/2 Ton Pickup
[i]The Red-Headed Amazon
Deep in the heart of Texas

John Kirchhoff
12-16-2006, 06:48 PM
You know where those shellac flakes come from? The lac bug no less. They produce them on their gross little bodies. Reminds too much of a cockroach and I hate bugs!

Original50
12-17-2006, 07:48 AM
quote:Originally posted by DilloCrafter

JDP gave you the biggest clue. I've read that the original corks were coated with shellac to keep them impervious and "floatable".

However, if any of you is a woodworker, you may know what solvent is used to cut shellac. Unfortunately, it's a solvent that is now found in much gasoline - ALCOHOL.

So, coating corks with shellac is no longer a good idea. What I did, when I was thinking of re-using my old sending unit was to order some gas tank sealant from POR-15. I thought I would need it in my tank, and I also used it to coat the original cork. It "test-floated" very well in water, so that POR-15 or some other brand of gas tank inner sealant paint/coating might be the answer.

http://rocketdillo.com/studebaker/misc/images/Avacar-hcsdc.gif[/img=left]DilloCrafter

1955 1/2 Ton Pickup
[i]The Red-Headed Amazon
Deep in the heart of Texas


DilloCrafter, You are right on the money with your suggestion. I gave my tank to my POR15 Distributor here in town, (He restores gas tanks for folks) and he used the POR15 gas tank sealant in the tank and on the cork for the sending unit. Prior to Gary Chrissman getting the tank I had it Chemically dipped to get out all of that gunk in the tank, by Chemstrip of Burlington, N.C. It now looks like a brand new tank, but it is 57 years old :)

Don Dodson

studeboy28
12-17-2006, 07:43 PM
What about using JB Weld on the outside of the cork??
I have used that stuff to repair leaks on old gas tanks when I was in college. it lasted for the two years i owned the car??

28 dictator
40 commander

bradnree
12-21-2006, 08:38 AM
So far I have learned that JC Whitney and Summit have senders that will work. NAPA has fuel tank sealer for about $20 per quart--QUART NOT PINT, for the cork. I bought 2 corks at the local hardware store for $1.74. A friend of mine has redone three Studes. and uses the JC sending units. If my sending unit does not work I'll order a new one......Brad

ROADRACELARK
12-21-2006, 09:02 AM
Go to your local junk yard, get a sender from a late model car or truck that has the new "hi-tech" plastic/foam floats....they're impervious to any fuel you'd be puttin' in your tank.;)
Dan Miller
Atlanta, GA

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Henry Votel
12-21-2006, 10:20 AM
Playing around with a cork float and the attendant issues seems futile. Get a modern brass or impermeable gas tank float and use that kind. Google or eBay: gas tank float for examples and sources. FYI.


Henry Votel
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bradnree
12-21-2006, 05:34 PM
NAPA has each type of float for sale--metal or plastic, $8.00 each.....Brad

SB-Danny
10-02-2016, 12:29 PM
My problem is that when I was taking out my fuel sensor unit the cork came off and is in gas tank.. Now what? Can I leave it there?

56Golden
10-02-2016, 12:42 PM
My problem is that when I was taking out my fuel sensor unit the cork came off and is in gas tank.. Now what? Can I leave it there?

Welcome to the SDC Forum!!! :!:

What model/year Studebaker are you referring to? Some model/year Studebakers take a different float and it must be positioned just so to obtain a correct gauge reading.

GrumpyOne
10-02-2016, 01:10 PM
JDP gave you the biggest clue. I've read that the original corks were coated with shellac to keep them impervious and "floatable".

However, if any of you is a woodworker, you may know what solvent is used to cut shellac. Unfortunately, it's a solvent that is now found in much gasoline - ALCOHOL.

So, coating corks with shellac is no longer a good idea. What I did, when I was thinking of re-using my old sending unit was to order some gas tank sealant from POR-15. I thought I would need it in my tank, and I also used it to coat the original cork. It "test-floated" very well in water, so that POR-15 or some other brand of gas tank inner sealant paint/coating might be the answer.

http://rocketdillo.com/studebaker/misc/images/Avacar-hcsdc.gif[/img=left]DilloCrafter

1955 1/2 Ton Pickup
[I]The Red-Headed Amazon
Deep in the heart of Texas


That's excellent information... And BTW, you're just about a half dozen miles down the road from me!

53 Commander
10-02-2016, 01:23 PM
Here's an alternative to using the cork float. http://www.gudim.com/ReplacingCorkFloats.html

Coupe Express
10-02-2016, 03:06 PM
I have two easy solutions for you. First, if you want to stay with a cork float coat it with Super Glue. It is totally impervious to gas and alcohol. Or, second, replace the cork with a plastic one -- available from Mac's Ford Parts for $4.95 (P/N 64-24795)