Tank Venting 101

[Z.hb71]

What you mean?

He's stating the obvious, aka what he does best ???????

 

[Seandonato73]

Read the article in the link Doug. The vids were so you can understand how the carb works. And how it isnt dependent solely on what's going on in the tank. The tank should freely vent to atmosphere. Save for a roll over for the sake of not getting fuel everywhere.

 

[DougStar]

Explaining how a carb works was great??

 

[cbaker65]

I run my weed eater upside down for vertical edging ,I had probably changed that vent out twice in the 15 year period of
running that weed eater ,if I was just cutting brush ,I wouldn't have cared ,but when your doing fancy homes ,the 2 stroke
gas will stain the grass & side walks!

 

[Seandonato73]

Most weedwacker / chain saw vent work off the tank pulling slight vaccum so they don't leak. Turn it upside down with the engine off it will leak. Stihl used to use a small length of fuel line with a special grub screw in it to mitigate the loss of fuel, then moved to a goofy tank vent contraption. Pic 1 is a mantis tiller powered by an echo engine. Look familiar? Same sort of breather we use.

 

[crucialRC]

So if I'm reading this correctly then the only people who got it right was Snappy because their vent let's air both in and out but they also supply a check ball to prevent spillage in the event of a rollover. I wonder why the TLR is different? Or is mine messed up? How does yours work Doug?

 

[Seandonato73]

Idk about that. The bladder style works too it will just let fuel drip out if its upside down for a wile. Still vents the tank just fine.

 

[crucialRC]

Idk about that. The bladder style works too it will just let fuel drip out if its upside down for a wile. Still vents the tank just fine.

Ok so maybe something is wrong with mine cause it allows air in?

 

[Seandonato73]

It should let air in. Ok here look. Standard cap (my hole is plugged because I run the snappy fuel kit) the rubber has a hole in it, then theres what I will call the baffle, then theres another hole in the cap to vent to atmosphere.

 

[crucialRC]

Sorry Sean, but mine only allows air in. It doesn't allow air out. That's what I meant to say. I don't see a vent hole in the TLR gas cap. It's not like the bajas.

 

[Seandonato73]

That's my dbxl cap. Hmm. Well that's different from mine for sure. Kinda surprised me.

 

[crucialRC]

TLR cap...

 

[TODD]

Isn't that the vent to the right of the picture? Seems they had changed the fuel tanks a little in a picture from what I remember seeing.

 

[crucialRC]

Isn't that the vent to the right of the picture? Seems they had changed the fuel tanks a little in a picture from what I remember seeing.

Yes but like I said mine ONLY allows air in.

 

[Seandonato73]

Could be an issue with it? Found the parts list, but they don't call out a separate part number for just the vent. Thought that was odd. And they didnt have an exploded view of just the cap/fittings/vent

 

[crucialRC]

Yup everything within the dashed line comes with the tank. Ask me how I know.?

 

[Seandonato73]

So I was doing some research on the interweb for this and came across a similar thread on musk forum. (I know, I know) but this is how he ended up fixing it.
So may be just a bad vent is your issue?

 

[Z.hb71]

musk forum. (I know, I know)

whats wrong with msuk?

 

[mark35]

whats wrong with msuk?

Ask Mike he'll tell ya??

 

[DougStar]

Ah please do we need a bita light entertainment round here???????

Ask Mike he'll tell ya??