Carbon canister HELP!

Carbon canister HELP!

Author
Discussion

Mike8448

Original Poster:

61 posts

98 months

Sunday 2nd October 2016
quotequote all
Ok need some info on the carbon canister.

My griffith was already stripped when i got it. As i understand, fuel is to be taken from the out of the fuel rail to the canister then back to the tank. As i understand it.

Having looked at photos of engine bays etci just cant seem to confirm if my understanding is actually correct.

Can anyone confirm that?

Cheers all 🍻

Steve_D

13,737 posts

257 months

Sunday 2nd October 2016
quotequote all
Mike8448 said:
Ok need some info on the carbon canister.

My griffith was already stripped when i got it. As i understand, fuel is to be taken from the out of the fuel rail to the canister then back to the tank. As i understand it.

Having looked at photos of engine bays etci just cant seem to confirm if my understanding is actually correct.

Can anyone confirm that?

Cheers all ??
There will be one pipe from the breather system on the fuel tank running forward to the carbon canister.
A pipe then goes from the canister to the side of the plenum.
There will only be fumes passing along these pipes.
There is a valve in the canister operated by the engine ECU to decide when the valve is opened to purge the canister into the inlet manifold.

You don't actually need it and could blank of the connection to the plenum and the connection at the tank and bin everything else.

Steve

steve-V8s

2,899 posts

247 months

Monday 3rd October 2016
quotequote all
As the previous Steve said it is just fumes not fuel.

There should be three pipes going back to the tank, one from the pump feeds the fuel rail, one takes the recycled the fuel back to the tank, this is controlled by the pressure regulator. A third one comes from the top of the tank near to the filler all they way back to the canister mounted behind a panel in the front wing. Normally the tank can breath out to atmosphere via the canister which captures the fumes. An additional pipe goes from the canister to the inlet manifold via a solenoid valve. When the ECU thinks it is appropriate it opens the valve allowing the engine to ingest that which is stored in the canister.

A popular and entirely sensible solution is to remove the whole arrangement and block the hole the manifold plumbing. However the tank will still need to breathe somewhere, if you just leave the pipe open somewhere under the bonnet some say you get the odd whiff of fuel. On my car the rubber breather pipe was so tightly cable tied to the chassis that it seems unlikely anything ever found its way from one end to the other.

Removing the entire contraption produces a nice easy weight loss.

Mike8448

Original Poster:

61 posts

98 months

Monday 3rd October 2016
quotequote all
Thanks Guys.

Now you have said that it fuel fumes, makes more sense, I was completely confused as to why fuel had to go through such a contraption.

I will simply vent the fumes out the back at the chassis. NO FUMES should then pass into the cabin.

OK so baring that in mind... I assume MOT time will be of no issue at all with regards an emissions?

Cheers
Mike

jesfirth

1,743 posts

241 months

Monday 3rd October 2016
quotequote all
mike,

I removed the whole lot from my griff and binned it all about 6 years ago and it had no effect on emissions. I just cut the rubber tank vent pipe short and cable tied it to the chassis by the diff with about 25mm below the chassis level. it vents nicely.

Loubaruch

1,164 posts

197 months

stevesprint

1,114 posts

178 months

Tuesday 4th October 2016
quotequote all
steve-V8s said:
As the previous Steve said it is just fumes not fuel.

There should be three pipes going back to the tank, one from the pump feeds the fuel rail, one takes the recycled the fuel back to the tank, this is controlled by the pressure regulator. A third one comes from the top of the tank near to the filler all they way back to the canister mounted behind a panel in the front wing. Normally the tank can breath out to atmosphere via the canister which captures the fumes. An additional pipe goes from the canister to the inlet manifold via a solenoid valve. When the ECU thinks it is appropriate it opens the valve allowing the engine to ingest that which is stored in the canister.

A popular and entirely sensible solution is to remove the whole arrangement and block the hole the manifold plumbing. However the tank will still need to breathe somewhere, if you just leave the pipe open somewhere under the bonnet some say you get the odd whiff of fuel. On my car the rubber breather pipe was so tightly cable tied to the chassis that it seems unlikely anything ever found its way from one end to the other.

Removing the entire contraption produces a nice easy weight loss.
Thanks for the detailed explanation, Precats don't have the carbon canister and binning it can't do any harm except to the environment. I believe the idea is the fumes from the fuel tank are fed into the inlet for burning.

Sardonicus

18,928 posts

220 months

Wednesday 5th October 2016
quotequote all
stevesprint said:
Thanks for the detailed explanation, Precats don't have the carbon canister and binning it can't do any harm except to the environment. I believe the idea is the fumes from the fuel tank are fed into the inlet for burning.
This ^ its so the fumes dont get vented to atmosphere wink not engine/exhaust emissions.....still never mind they are dumping kerosene/fuel from jet planes daily over us which is a known cancer gene rolleyes my point is dont feel bad most cars prior to the mid 80's all vented to atmosphere barring Japanese stuff