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EFV-8 Club Forum / Light Commercial Truck Discussion / hydrostatic gasket

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Posted By Discussion Topic: hydrostatic gasket -- page: 1 2

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Big35
02-13-2020 @ 12:03 PM
Member
Posts: 8
Joined: Nov 2018
          
Thanks 37

37RAGTOPMAN
02-12-2020 @ 8:01 AM
Senior
Posts: 1941
Joined: Oct 2009
          
BIG35
I would reseal RESEAL the tank, with gas tank sealer, this is after you reinstall the plate were it is leaking,
sealing from the inside, I think is what I would do, this will seal , the treads of the screws and the gaskets from the inside, completely !!!
hope this helps 1937RAGTOPMAN

Big35
02-12-2020 @ 5:55 AM
Member
Posts: 8
Joined: Nov 2018
          
By using a blank off to replace the hydrostatic sender, will this create a non-venting/fuel starvation problem? The gas cap appears to be non vented type.

Big35
02-09-2020 @ 7:32 AM
Member
Posts: 8
Joined: Nov 2018
          
The tank was cleaned and sealed by a local radiator shop 2 years ago. I made a paper gasket from gasket paper without sealant and installed the sending unit. The leaks then were minor and I put up with them or ran the truck until the gas was used up. Lately when driving around the neighborhood I noticed the leaks getting worse. I then removed the tank and tested several other gasket options that I stated earlier. Now the take with the gasket maker sealant is holding the gas. I will be installing it back in the truck this week and hopefully this will be the end. On to other truck repairs. Thanks again fellow flatheads.

37RAGTOPMAN
02-07-2020 @ 7:29 AM
Senior
Posts: 1941
Joined: Oct 2009
          
BIG 35
to make a permanent repair,on your gas tank leak'
take the tank out and clean the tank , so no dirt is in it,
remove all the parts,
make a gasket for the leaking fixture,. use some of the gas tank sealer, on the gasket and the treads on the bolts,
reinstall , now duck tape all the hole except one,
get some GAS TANK SEALER, pour it in, now seal that hole with duck tape, and slosh it all over the inside of tank
follow instructions. on the label
let it dry for a week, in the sun it will dry quicker,
THIS will fit any pin holes and will seal what is leaking,
I did this more than once and never had a problem.,
hope this helps 1937RAGTOPMAN use the gas tank sealer for modern gas,

37RAGTOPMAN
02-06-2020 @ 1:37 PM
Senior
Posts: 1941
Joined: Oct 2009
          
HI
what it the history of the truck, something you just bought ? someone else restored it, ?

you could try a fuel pump diaphragm for a gasket,[ might be close to the size you need,] with a little ingenuity
you could make one,
hope this helps, 1937RAGTOPMAN

This message was edited by 37RAGTOPMAN on 2-6-20 @ 1:45 PM

TomO
02-06-2020 @ 10:35 AM
Senior
Posts: 7243
Joined: Oct 2009
          
I have seen 2 types of sending unit flanges on the gas tanks. The most common one has a flange soldered to the tank with the holes only in the flange. To make sure that you get a good seal with that type, the solder must be around the bottom inside of the flange, to keep the fuel from reaching the screw threads.

To seal it without soldering, you can put a fuel safe sealer like Seal All or Pematex type 1 RTV around the inner lip of the opening and let it cure before installing the sending unit. Then put a small dab of Permatex #2 in each of the screw holes with a toothpick, install the unit with Permatx #2 on the screw threads.

If you have the other type where the mounting is directly to the tank and the threads of the holes go through to the tank, you will have to find a way to seal the bottom of the holes.

Tom

Big35
02-06-2020 @ 9:52 AM
Member
Posts: 8
Joined: Nov 2018
          
After letting the gasket maker cure for a couple of days, I added gas to check for leaks. The bolt hole bores do not seem to be open ended but somehow gas did seep around the brass washers and gasket. This time I did used the sealant (gasket maker) on the threads and washers to hopefully seal. I will let you know the results and thanks again for the help.

carcrazy
02-06-2020 @ 8:54 AM
Senior
Posts: 1587
Joined: Oct 2009
          
Here are two different sealants that you can try. If you ever want to remove the sending unit or other item that you are trying to seal, use Permatex #2 non-hardening sealant. Use a cork gasket and coat both sides of it before installing. Be sure to coat the threads of each of the screws with Permatex #2 before installing them into the tank. If you want a totally leak free installation but one that will be harder to undo, use an epoxy product like J-B Weld.

TomO
02-06-2020 @ 6:59 AM
Senior
Posts: 7243
Joined: Oct 2009
          
The gasket should be made from a cork based material that is available in the Felpro Gasket Material Part # 3060.

This package is available in most auto parts stores. If they do not have it in stock, they can order it.

I noticed that your mounting screws go all the way through the bottom of the tank. You will have to use a good sealer on the threads or they will leak. The newer formulations of gas find leaks where the mid 20th Century gas would not leak.

Tom

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