evaporative emmission canister 1999 superduty

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Doctor John - 06 Jul 2005 15:34 GMT

I noticed a strong gas odor while driving my 1999 Superduty V-10, which I
recently acquired. I checked for fuel line leaks and then looked into the
charcoal evap. emm. canister. This canister has one hose going to it from
the gas tank to collect vapor and then it just has an open vent on the front
end which vents into the engine compartment. I think this is the source of
my gas fumes. I've check out two different shop manuals and they describe a
purge valve system which removes vapor from this canister and routes it to
the engine for burning. My truck was built in Canada, and it either never
had this purge system, or it has been removed. I can't find any clear
photos showing this setup. Does anyone have any info on this? I need
another way to route the gas vapors other than into the engine compartment -
I got quite a buzz driving in hot weather the other day with the AC on - the
AC picked up the fumes and dumped them into the cab!

Thanks

John

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Spdloader - 06 Jul 2005 23:38 GMT

Until you get it fixed, run the AC on Max. That should recirculate cab air
only.

Spdloader

>I noticed a strong gas odor while driving my 1999 Superduty V-10, which I
> recently acquired. I checked for fuel line leaks and then looked into the
[quoted text clipped - 18 lines]
>
> John

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Doctor John - 07 Jul 2005 00:09 GMT

Thanks - that's a good idea. I've been looking around the engine
compartment and the canister purge system appears to be non-existent ... it
isn't just disconnected hoses. I'm thinking of drilling a 1/4 inch hole in
the air filter casing and using vacuum line to vent the canister directly
into the air intake ....

John

> Until you get it fixed, run the AC on Max. That should recirculate cab air
> only.
[quoted text clipped - 23 lines]
> >
> > John

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Spdloader - 07 Jul 2005 02:07 GMT

I'm not going to say don't do it, but I wouldn't, there's no way to control
it, because the computer can't gauge it. You'll have another issue if you do
that.
Is the smell worse when your tank is full? Hot weather can make lots of fuel
vapor. Could be the canister element is saturated. Could be it's not the
culprit at all.

Spdloader

> Thanks - that's a good idea. I've been looking around the engine
> compartment and the canister purge system appears to be non-existent ...
[quoted text clipped - 41 lines]
>> >
>> > John

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Doctor John - 07 Jul 2005 03:17 GMT

The tank was about 3/4 full and it was about 85 degrees outside. This was
the first time I ran the AC on this truck. I'm fairly certain the fumes
were coming from the canister - it just vents into the engine compartment.
From what I can read by the shop manual, the purge valve system may be
optional, so maybe it was never installed in this truck. What is missing is
the canister vent solenoid and the evap emissions canister purge valve plus
all the electronics and hoses. I took out the canister and blew air through
it and now I'm letting it dry out in the sun. I will probably replace it,
but I wonder how long until a new one gets saturated? It seems weird that
it would just vent into the engine compartment. Maybe there is a cover on
the large (about one inch) opening which would normally have a purge valve
attached - I wonder if I should plug this up? I agree venting into the air
cleaner is risky, so I'll probably scratch this idea. Thanks for the
input - I'm open to any other ideas on this.

John

> I'm not going to say don't do it, but I wouldn't, there's no way to control
> it, because the computer can't gauge it. You'll have another issue if you do
[quoted text clipped - 50 lines]
> >> >
> >> > John

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putt@webtv.net - 08 Jul 2005 13:54 GMT

>but I wonder how long until a new one
> gets saturated?

That piece should last the life of the truck. It is full of little
charcoal granules. The charcoal 'holds' the fumes. The mass of
granules is held under pressure by a spring-loaded flap under the top of
the cannister.

It doesn't made sense that the piece is there and a line is going to the
fuel tank, but the purge system is missing. It had to have been
removed. Just the purge system being 'optional' doesn't make sense
either. I'd either head to a Ford dealer for some help, or find a
similar truck and check out it's system. Car lots, junk yards, Ford
truck clubs would be good sources for info. Try asking your question
here: www.ford-trucks.com

That group should be able to help.

Dave S(Texas)

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Doctor John - 08 Jul 2005 15:39 GMT

The shop manual CD I have shows both of the missing parts and states " if
equipped" which I think means these are optional. I blew some air at low
pressure through the canister and it just flows through - no backup
pressure. I agree it doesn't make sense for it to vent into the engine
compartment. I'll check out the site you recommended. Thanks

John

> >but I wonder how long until a new one
> > gets saturated?
[quoted text clipped - 15 lines]
>
> Dave S(Texas)

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