JB weld and gas

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woodyman

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I am doing a mod on my Husqvarna 44 gas tank.I am putting a vent tube where there is none because the vented gas cap I got new leaks and I want to eliminate it.My question is will the JB weld hold up in gas?Also,has anyone done this to a saw before?Thanks. While waiting for an answer I have another question.Which cover looks best on the 44?
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JB Weld holds up well to gasoline.

See http://www.jbweld.net/products/uses.php#jbweld

There is another product called "Gas tank Repair" something. You can get it at most auto parts stores. It's an epoxy that comes as a two-part putty. You mix the two parts together like play-dough, and it will seal up a hole in a gas tank. I've used that before and it works very well ... the repair lasted years.

What sort of vent are you putting in? How will you prevent leaks from the vent tube?
 
I used jb to fix a gasket problems in my stihl 031av and a poulan super 25da, worked great no leaks. I also used the gas tank sealer to try to save the tank on my 365 husky, didn't work, the seam was split and the sealer didn't take, my stuff wasn't 2 part just squeeze tube.
 
JB Weld holds up well to gasoline.

See http://www.jbweld.net/products/uses.php#jbweld

There is another product called "Gas tank Repair" something. You can get it at most auto parts stores. It's an epoxy that comes as a two-part putty. You mix the two parts together like play-dough, and it will seal up a hole in a gas tank. I've used that before and it works very well ... the repair lasted years.

What sort of vent are you putting in? How will you prevent leaks from the vent tube?

I am putting in a vent tube off a Husqvarna 268.It is a two peice vent that screws in so I will have to drill and tap for it.It is cracked where the two halfs come together and that is where the JB weld will go.
 
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Orange one is off a 240 ,white is stock and the black is modded,it's off a newer 44 with the 3/4" thick air filer and the air filters for the white and orange covers are 1/2" thick.
 
I like the white, just because you don't see it much. I just got a 50 rancher for free and put a new piston in it, it has the white cover which I think is neat
 
JB weld does not bond well to plastics. If you roughen the surface, you may be able to create a decent mechanical bond, but I suggest using an epoxy that is specifically designed for plastics.

JB is a good product and I often use it, but not on plastics.
 
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Heres pics of the vent,it is cracked where they connect.Maybe I will get a new one and fit the top of this one while I wait.Don't know if I need the bottom part or not,the filter is in the top part of it.
 
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JB weld does not bond well to plastics. If you roughen the surface, you may be able to create a decent mechanical bond, but I suggest using an epoxy that is specifically designed for plastics.

JB is a good product and I often use it, but not on plastics.

Yeah, both tanks I used it on were magnesium, no plastic.
 
JB weld does not bond well to plastics. If you roughen the surface, you may be able to create a decent mechanical bond, but I suggest using an epoxy that is specifically designed for plastics.

JB is a good product and I often use it, but not on plastics.

It says it works on PVC pipe,is that the same as plastic?I think I will give it a try tomorrow night and see what happens.
 
I am putting in a vent tube off a Husqvarna 268.It is a two peice vent that screws in so I will have to drill and tap for it.It is cracked where the two halfs come together and that is where the JB weld will go.

That's a good point ... I've only used it on metal and wood. When you try it out, make sure you scuff the plastic with sandpaper. That will greatly increase your chances for success.

Which cover looks best on the 44?

Orange looks best, white looks 2nd best.

Black makes it look too much like halloween candy.
 
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That's a good point ... I've only used it on metal and wood. When you try it out, make sure you scuff the plastic with sandpaper. That will greatly increase your chances for success.



Orange looks best, white looks 2nd best.

Black makes it look too much like halloween candy.

Orange makes it look like a real pro model like the 444.
 
I've had very good luck using 3M 2216 for plastic repairs. However, it is expensive ($32 for 2 oz) and usually must be ordered online I don't know if it is resistant to gasoline, either.

JB works very well on metal, but it does not form a good chemical bond with most plastics, in my experience.

There are a gazillion flavors of designer epoxies out there. Hard to keep up with them all.

Some of the designer superglues work OK on plastic, too, but I don't know if they resist gasoline.
 
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maybe some heat shrink tubing with the hot melt glue in it will work. used it on outboards under the cowling, where there's plenty of heat and petrol fumes. marine stores have it.
 
You are WAAAAYYYY overthinking this one. Just get a piece of tygon fuel line, and two Stihl grub srews. Drill the hole in the top of your tank several thousandths smaller than the line, and force it in there. wind the grub screws in, and your done. Total cost, less than $3. It will probably last 20 years that way.
 
I had a leak form between the petcock and poly tank on my 4-wheeler.Couldn't remove the petcock to repair (screw bosses turning in the tank).Tried all the expensive epoxy's with no luck nothing would bond to the poly tank.Walking through the hardware store one day found this stuff called SEAL-ALL it's a contact adhesive $1.29 a tube.Worked mint has been on for over a year no leaks.I have since repaired a few plastic mower tanks and had good luck.
 
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