Fuel Breather Quickie

I don't know much about this. I have a pipe in the engine bay running along the top with a t piece in the middle - I'm guessing it's the breather hose. The T piece is knackered i.e. cracked etc, but the one end of the T piece is no longer connected to anything. I'm guessing this connected to the air filter before the ICT 34s were installed. Should I remove the T piece and just have one hose running from right to left? Does it matter??

Thanks for any advice

 

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I think it should still connect to airfilter. Wait for advice from a real knowledable chap.

 

If you don't connect it, petrol fumes exit into the engine compartment. If you block it off then your tank can't breath. You need to find a way to return it to the carb inlet somehow so fumes get sucked into the engine. Then that fire extinguisher won't be needed.

 

Mine was like that and I routed it to my ict34s air filter

 

yep, as above. route it into the top of the air clean on one of your carbs.

 

Mine just goes outside through the tinware.

 

same for me a pipe goes through a hole in the battery tray.

ideally they say it should go to the carb but most older stuff and motorbikes vent to atmosphere and in my mind if it’s connected to the air filter the engines not running the fumes probably vent through the air filter to the engine compartment

 

Ideally it goes to a charcoal canister that is connected to downstream of an air filter.
Fumes produced with the engine off get trapped in the canister. When it warms up above the engine, the fumes are released and sucked in when the engine runs.
Next best is downstream of a proper filter with a flap that drops pressure a few millibars with the engine running and closes off the entrance to the filter with the engine stopped. Like an oil bath or stock paper filter assembly as used on single and stock dual carbs.

Then jam it into the top of a filter is sort of ok.
Venting it outside is just giving up.

 

I have a stock oil filter,but I really can’t see anywhere on it,where a pipe would fit,tbh.

 

On the oil bath filter , if you have one its a fairly small diameter nipple on the side of the bottom part of the "drum" to the left of the main air inlet pipe. Not the larger diameter crank case breather that goes up into the air inlet on the left.

Basically a fitting in a similar position would provide suction for the fumes from the tank if you didnt have one.

Not all oil bath filters will have them, as the design changed over the years .. on older buses, the breather pipe for the tank was up by the filler spout, so no need for a tank breather connection in the engine bay. Later on you get the pipes meeting at the T piece and then going over to the air cleaner.

There is also the different arrangements for the hot air flap in the air cleaner - wire from fan housing flap mechanism. then wax capsule operating the lever, then thermostatically vacuum operated flap. I think the thermostatic operated flap ones would definitely have the tank breather connection .

 

Yeah. Had another look.
Only breather pipe I have from my air filter is a large one,about 12mm or so which connects to the oil filler.

 

This I think is about correct for the year of my bus.

 

I thought I'd have a quick check of my fuel and breather pipes and hoses. They are all good, I've changed all the fuel ones from tank to carb and most of the breather connections but haven't done the one behind the spare wheel well yet. I managed to feel it and it feels OK but is there an easy way to change it? I guess I'll have to remove the leasure battery and just grope about up there....any tips will be gratefully received.

 

Removing the rear light helps enormously with access to that breather

 

Thank you for that @Day ,I thought I'd need double jointed arms.