Prelude Charcoal Cansiter

Mudgey · Post by **Mudgey** » Wed May 01, 2013 3:20 pm

Hello,

I am looking to fit the prelude charcoal cansiter back onto my k-swap prelude, however it has 3 hoses at the top! I know where two of them should go, but what about the 3rd?

1. to the petrol tank vent pipe.
2. to the purge valve on the k20.
3. Small pipe - not sure where?

The 3rd pipe almost looks like a vacuum pipe leading to a small vacuum valve on the charcoal canister, I can only assume the prelude doesn't run a purge valve and the canister is purged every time the engine is under vacuum!?

Can somebody please clarify where the hoses go and how it works on the prelude?

Thanks, Mudgey

Post by **Lude-dude** » Wed May 01, 2013 4:22 pm

why bother, I haven't had one for 7 years

Post by **NafemanNathan** » Wed May 01, 2013 4:28 pm

Is it not to the TB or back of the IM?

Mudgey · Post by **Mudgey** » Wed May 01, 2013 4:31 pm

A number of reasons:

1. Not really looked into this statement but I have heard that fuel vapours are worse for the atmosphere than burn't fuel.
2. Don't want fuel seeping out the vent pipe & onto the floor.
3. Don't want fumes hanging around my car as the fuel vapours vent.

Post by **NafemanNathan** » Wed May 01, 2013 4:38 pm

I think I recall the one out the bottom running down the side of the arch/shock tower and literally just being open ended (Basically able to drip to the ground).

Post by **NafemanNathan** » Wed May 01, 2013 4:41 pm

Oh no, see from item 15 here. It' looks like it's a means to drain the canister. There is a bypass to it though

Mudgey · Post by **Mudgey** » Wed May 01, 2013 4:52 pm

From what I have read, the crystals in the charcoal canister capture the vapours, and every now and again the purge valve opens to draw air through the canister (though the open tube) and it cleans the crystals of the vapours.

Post by **NafemanNathan** » Wed May 01, 2013 5:00 pm

So that's referring to the bottom connection then and the bypass valve. So one top connection runs back to the tank, and the other one is to the TB or IM as I'm pretty sure when it's told to it allows a burst of these vapours into the plenum to help with cold start ups.

Supercharged 無限MUGEN BB1 Profile · Post by **nucleustylzlude** » Wed May 01, 2013 5:27 pm

Mudgey wrote:A number of reasons:

1. Not really looked into this statement but I have heard that fuel vapours are worse for the atmosphere than burn't fuel.
2. Don't want fuel seeping out the vent pipe & onto the floor.
3. Don't want fumes hanging around my car as the fuel vapours vent.

1. Not sure, but don't get me started on my scepticism of the whole emissions and environment debate! Answer is no-one knows, seeing as there is no full evidence to bullshit emissions taxing and what not!
2. Fuel won't seep out, there is a one way valve near the fuel tank, retain that and you're good.
3. For the little amount it will vent through the valve, it's really nothing to worry about. Never heard of anything becoming of this, even kept in garages for long periods of time.

Post by **Donald** » Wed May 01, 2013 6:01 pm

As nuc said, personally I wouldn't worry about point 1. Fuel vapours are made of the same stuff as... fuel. It's all hydrogen and carbon. Toxic? Yes, in a certain kind of way. You'd have to be breathing/drinking the stuff though really. Combustion of them IMO is going to be worse as you're changing the molecule and releasing CO2. In it's normal state, it's a very stable molecule. Wont just start changing on it's own. After all... they've been underground for millions of years.