Author Topic: Poulan 3450 gas leak  (Read 222 times)

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Offline Dogbyte

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Poulan 3450 gas leak
« on: June 04, 2015, 08:37:11 am »
I have had others suggest it may be some type of vent instead of a bad seam on the tank? but from what i understand, that vent is up near the top of the tank when the saw is sitting upright, so if the saw leaks gas just sitting upright, wouldnt that rule out the vent?

i have the saw on its side, as i give it fuel, i can begin to see it leak where ive circled it in red. any ideas?

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Offline Cut4fun .

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Re: Poulan 3450 gas leak
« Reply #1 on: June 04, 2015, 10:18:48 am »
i cant see pic right now. tank vent on 3450 is hidden behind left side crankcase. fuel line on top left of carb. if fuel line shrinks where passes through tank. fuel will seep by and run down tank. if brass tank vent and duck valve missing leak it will leak down the tank too.
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Offline fossil

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Re: Poulan 3450 gas leak
« Reply #2 on: June 04, 2015, 12:11:21 pm »
I's leaking at the back of the tank (in front of the rear handle) at the seam Kevin.

I'm pretty sure those tanks are ABS so you might try sealing from the inside with some ABS pipe cement. That stuff is not a glue but it dissolves the styrene and the styrene welds itself together.

Someone else may have a better solution for you other than buying a new tank / handle assembly.
Tim

Offline Dogbyte

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Re: Poulan 3450 gas leak
« Reply #3 on: June 04, 2015, 04:42:30 pm »
When i took that pic, i think i was testing to see if it was the seam, by slowly pouring in gas until it got up to that point on the tank, then it started leaking... could ANY of the vents leak with only half a tank as it lays on its side?

i also wondered if you could get a soldering iron and seal the seam with ABS strips from elsewhere, and just weld it back together. that works good on other plastic tanks, they arent this thin though. The cement may be easier, as long as i can see the seam from the inside good enough.

Offline 660magnum

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Re: Poulan 3450 gas leak
« Reply #4 on: June 04, 2015, 05:00:30 pm »
I think you will find the tank is molded of "PP" (polypropylene) plastic and not ABS plastic. Most solvents or glues do not work on it.

Plastic welding works. You need polypropylene plastic as a filler material. Some people have used string trimmer line as filler rod.
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Offline Dogbyte

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Re: Poulan 3450 gas leak
« Reply #5 on: June 04, 2015, 05:11:08 pm »
I think you will find the tank is molded of "PP" (polypropylene) plastic and not ABS plastic. Most solvents or glues do not work on it.

Plastic welding works. You need polypropylene plastic as a filler material. Some people have used string trimmer line as filler rod.

i will try to weld it first, near where it looks to be leaking from. Im wondering if these seams progressively get worse, where the seam widens outward, making it worse. I really like this saw, a guy gave it to me, with a broke pull cord and muffler, and **** gas lines. It fixed right up and ive been using it ever since. I would hate to swap out gas tanks though, looks like the handle is built in. hope i dont have to take the tank off to weld any other spots.

Offline 660magnum

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Re: Poulan 3450 gas leak
« Reply #6 on: June 04, 2015, 05:41:29 pm »
The Poulan 3450 is a nice chainsaw.
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Offline 3000 FPS

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Re: Poulan 3450 gas leak
« Reply #7 on: June 04, 2015, 07:53:42 pm »
Let us know how the plastic weld works out.   I am interested in the success of that kind of repair.
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Offline Cut4fun .

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Re: Poulan 3450 gas leak
« Reply #8 on: June 05, 2015, 09:52:30 am »
I can see the pics today. While on the road I just use the text version  of the site and not full version.

Also look into SealAll over the seam if the plastic weld dont fix it.

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