chainsaw fuel tank vent challenge... please help

[Rubicon]

Hi guys. I own a small Husky 35 saw. The saw was built by TML in Canada and has also been badged as Frontier, Jonsered 361, Lombard Little Lightning, etc. They are all basically the same saw.

Here is the problem, maybe some of you can help me. I carry the saw on my ATV in an upright chainsaw carrier so that the bar faces straight down with the rear handle facing up. (I know, this is bad for the saw, but I have no choice) The problem is that in this position, fuel leaks badly out of the fuel tank vent. The saw holds such a small amount of fuel, that I can only cut for a few minutes once I reach my desired location.

This saw's vent system is as follows. There is a small "pinhole" drilled through the fuel tank casting. There is a small "wire" that is inserted in this pinhole so that under normal use, fuel leakage is kept at a minimum. It works well, except that in the position I must carry my saw, fuel leaks badly.

I have tried a few different ideas, but none of them have worked. For example, I tried installing an old style Stihl fuel tank vent, with the threaded inserts and clear plastic hose, but this still allows leaks.

Does anyone who knows how this saw is built have any ideas how I can retain the fuel tank vent function, yet prevent leakage in this position?

Thanks guys.

 

[pbuehning]

Take a 4" x 4" pc of plastic bag/drop cloth and place it under the fuel cap and screw it on, I've been doing this for years so the inside of my Expedition doesn't smell like a gas station. Oh yeah, don't forget to remove it when you want to use it.

 

[THALL10326]

Take a 4" x 4" pc of plastic bag/drop cloth and place it under the fuel cap and screw it on, I've been doing this for years so the inside of my Expedition doesn't smell like a gas station. Oh yeah, don't forget to remove it when you want to use it.

Now thats a pretty slick move. I'm gonna remember that.

 

[Cut4fun]

I use the plastic piece also under the cap on vented gas cans. Never know when you have to carry gas in a can in a suv etc.

 

[sawn_penn]

We had some backpack frames modified to carry saws in that same position. The frame also carried fuel, oil, spare chains, tools, etc.

Have you thought about not fueling the saw until you get to your destination?

Saws don't run for too long without refueling. If you have to carry fuel/oil, you could just make a practice of filling up just before working rather than just after working.

 

[Rubicon]

Great tip, thanks.

The problem is that on this saw, the vent is not on the fuel cap, but on the fuel tank itself.

Any other suggestions? Thanks for the feedback so far.

 

[Rubicon]

The thing is, I keep this saw fueled up at all times because it gets used a lot when I'm not on my ATV. It would be a bit of a pain to have to drain the gas every time I want to mount the saw on the ATV. Also, when I'm done with my cutting, I would have to empty the gas before remounting it on the ATV.

Once again, a great tip. Thanks.

 

[JohnL]

Plug the original vent, then use a vented cap, then use the plastic sheet to block it off.

 

[stihlatit]

Keep the mixed fuel in a can until you get to the destination and then fill the saw. Seeing as it has a small tank put enough in for the necesary cuts and run out of fuel. Cumbersome bout a possible option.

 

[Patrick62]

I had to search to find what critter you are working with. Hanging the saw vertical, is that the same way that they hang them in the bucket when doing high limbing?? Anyway, you described a wire thru a hole. I am going to assume that the cap screws on tight enough to seal so the leakage is the blasted vent. Could you get brutal and drill and tap it out to 1/8" pipe thrread? If so then I bet you could maybe relocate the thing with a small hunk of fuel line. Stick a one way valve in there. Better yet, thread in a valve and put a breather hole on the end of it. Just a thought...

Maybe upgrade to something more modern? But if it works.... run it.

-Pat

 

[RaisedByWolves]

Set it up like a dirt bike...........

Get yourself a teeny tiny nipple(I may have one if you cant find one) Drill and tap to the proper thread. Screw the nipple in and attach fule line that is long enough to come about 1"-2" above fule level and insert some carefully filed,ground and or turned............... piece of........ Thing


Damn, Im drawing a blank on the name of the thing. Looks like a little brass cone made out of small beads that are used for a filter on a heater? Maby?


I know we use them on the air guns at work as a silencer.


Any way, you get the idea, wire tye the hose in place and the fuel will only find its own level in the tube, the brass filter will keep crap out, and the tank will still vent normaly.



Some days my bike is upside down more than upright and it hardly ever spills gas fron the tank vent