Hi All,

i am Currently head down bum up heavily involved in replacing my Vacuum lines with a kit that i had seen in one of the posts,

just wondering if there is a guide anywhere to servicing the Canister as i have noticed it getting a bit smelly in the cabin

as a sneaky side question .

i also ended up noticing what looks to be a vacuum hose just hanging there next to the charcoal canister open not blocked...would this be part of the reason for the smell. or would this be the hose the stops the tanks from imploding ?

Regards

 

Modern cars, ours included, have a closed vent system. Unwanted fumes are vented to the engine to be consumed in combustion. the open hose as in your car means it is venting to the atmosphere as in cars of yore.

Now, the system is very similar if not exactly that used by GM. I have a GM cartridge that came with my LT1 package. Immensely similar to the Jaguar unit residing on the right fender behind the head light. And, The GM schematic is about like the Jaguar unit. So much so that on hooking up the LT1, I used the same hose to purge . Seems to work just fine.

Now, the charcoal in it will eventually become saturated with residue. Fix or replace. The fix is to cut it open, remove the caked charcoal and replace with fresh. Fish acquirium stores are source for the charcoal. Reseal with duck tape or similar and good for another quarter century or so.

I wonder if pulverized BBQ charcoal briquettes would not fit the need.

Carl

 

Thanks Carl i will give that a whirl ...so just to confirm hose venting is bad...
i have also included a pretty picture of what i mean...now that i figured out how to upload photos.... i have now become unstoppable

is the hose that's just dangling meant to be plugged into anything ?

 

I gave up on this one i couldn't get the bolt off it was completely seized but i but the hose back in its hole might try again some other time

 

IIRC, you are supposed to clean the thing from time to time.

Well they do work for indigestion, so hey, why not?

 

Let us know if you ge a big "whoosh" next time you open your fuel tank filler cap.

Not sure about other markets but the USA cars had a couple pressure valves to control tank venting and vapor flow into the cannisters. The details escape me.....the valves opened at xx-pressure in one direction and yy-pressure in the other direction.....something like that.

Anyhow......

If the valves didn't work correctly the fuel tanks would either be subject to excessive vacuum and implode or excessive pressure and explode. Well, not explode like a bomb....but the opposite of implode.

The cheater fix was to disconnect the hose ahead of the valves and let the tanks vent to atmosphere, as Carl mentioned.

Cheers
DD

 

Yup, it's a good idea, but the units selected by Jaguar (at least on the 80s vintage models) are non-serviceable....unless you cut 'em open as Carl said.

Years ago....decades ago, actually.... I remember vapor cannisters on GM cars with replaceable parts and doing so was part of a "major tune up".

Cheers
DD

 

Okay, so when I pop my fuel caps I get that big 'whoosh' sound. Is that good or bad? I couldn't tell exactly from the way it was written Doug. If it's bad, I take it the time is now to clean out the cannister?

 

A small whoosh is OK. A big whoosh suggests trouble.

It won't be a dirty cannister causing the problem, methinks. The problem is the valve I mentioned. When you re-attached that hose you brought the valve back online and it isn;t allowing the tanks to vent enough.

Cheers
DD

 

Doug, where is this 'valve' you mentioned located?

 

It should be on the inner fenderwell behind the right front wheel. It'll have vacuum nipples pointing fore and aft.

If you don't see such a valve it might've been removed....or perhaps the non-USA cars are configured differently?

I'll find a pic when I have some time

Cheers
DD

 

o local não seria a frente da roda dianteira esquerda? como mostra a figura?

 

the plastic check valve in question is located left of the disconnected hose.
It is located between two rubber hoses of different diameters.
Reconnect the hose at the canister and remove the valve.

Push a 1/8" inch drill bit through either side of the valve to break the inner membrane in the valve.

Reinstall the valve and the pressure buildup and gsoline odor should disappear when you open the filler caps.
The disconnected hose is basically doing the same thing except it is allowing fuel gases to vent to atmosphere therefore the gasoline odor. Try the plastic valve fix. No side effects will happen.