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post #1 of 14 Old Sep 2nd, 2008, 5:54 pm Thread Starter
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Question LT gasping air

My '03 LT has just recently started gasping for air when I refuel?
Is this a sign of something I should be concerned about?
What, if anything, should I do to resolve the issue?

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post #2 of 14 Old Sep 2nd, 2008, 6:00 pm
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Re: LT gasping air

Sounds like the carbon canister. Do a search for how to remove it and I think this may solve your issue

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post #3 of 14 Old Sep 2nd, 2008, 6:04 pm
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Re: LT gasping air

Fix it now or you may damage your gas tank.

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post #4 of 14 Old Sep 2nd, 2008, 7:50 pm Thread Starter
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Re: LT gasping air

OK, will do.

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post #5 of 14 Old Sep 2nd, 2008, 7:51 pm Thread Starter
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Re: LT gasping air

Can you be more specific about damage?

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post #6 of 14 Old Sep 2nd, 2008, 7:55 pm
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Re: LT gasping air

Here's a quick way of checking whether the problem is your carbon canister. Locate the small black hose that exits under the saddlebag, probably on the right side.

Remove the gas cap and blow through the hose. Not kidding here. If the air you are blowing comes out of the gas tank filler opening (you'll hear it if it does) you don't have a canister problem.

If you are unable to blow anything through the hose, it's probably plugged. At that point you can either remove the canister as described elsewhere on this forum, or unplug the hose by squirting water through it.

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post #7 of 14 Old Sep 2nd, 2008, 8:05 pm Thread Starter
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Re: LT gasping air

Pardon my ig'nance, but are you refering to the single hose that comes out below the right bag by the back wheel? And are you saying that this is the canister "vent" line?

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post #8 of 14 Old Sep 2nd, 2008, 8:28 pm
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Re: LT gasping air

Yes he is. If enough negative pressure builds up in your tank it will collapse, taking the sending unit with it.



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post #9 of 14 Old Sep 2nd, 2008, 8:49 pm
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Re: LT gasping air

Labman - exactly correct. The problem that you are experiencing is that the fuel pump is pumping gas out of your tank, but there isn't any make-up air getting into the tank. A low pressure situation is being created. You hear a whoosh of air entering the tank when you remove the gas tank cap. Left uncorrected, the low pressure can create a vacuum which is strong enough to collapse the plastic fuel tank.

Make-up air enters through the hose beneath the right saddlebag, goes through a canister about the size of a mason jar located under the topcase, and then into the fuel tank. The cannister alos collects fumes from the tank and recycles them back.

The canister can become plugged as well, if you overfill the gas tank and fuel runs down the line inot the canister.

As a (cheap) first step, see if the rear hose is plugged.

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post #10 of 14 Old Sep 2nd, 2008, 9:00 pm
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Re: LT gasping air

Quote:
Originally Posted by Mike_H
Labman - exactly correct. The problem that you are experiencing is that the fuel pump is pumping gas out of your tank, but there isn't any make-up air getting into the tank. A low pressure situation is being created. You hear a whoosh of air entering the tank when you remove the gas tank cap. Left uncorrected, the low pressure can create a vacuum which is strong enough to collapse the plastic fuel tank.

Make-up air enters through the hose beneath the right saddlebag, goes through a canister about the size of a mason jar located under the topcase, and then into the fuel tank. The cannister alos collects fumes from the tank and recycles them back.

The canister can become plugged as well, if you overfill the gas tank and fuel runs down the line inot the canister.

As a (cheap) first step, see if the rear hose is plugged.
Is there a filter or anything to prevent dirt, bugs, etc, from entering that hose along with the air?

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post #11 of 14 Old Sep 2nd, 2008, 11:42 pm
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Re: LT gasping air

Nope, no filter.

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post #12 of 14 Old Sep 3rd, 2008, 6:03 pm Thread Starter
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Re: LT gasping air

Yo Mike thanks for the extra info. You mentioned "clearing" it out with water. Should I think that this means in the reverse direction? Or by squriting water from the tank back to the canister?

Thanks,

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post #13 of 14 Old Sep 3rd, 2008, 6:27 pm
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Re: LT gasping air

Whatever works, just don't get water into the canister. I disconnected the line from the canister, injected water into the line and blew. That worked in my instance because the line was plugged. If your line isn't plugged, the canister is kaput and needs to be removed. Replacement is optional.

You can get to the canister by removing rear seat and the topcase. Both are very easy to do.

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post #14 of 14 Old Sep 3rd, 2008, 6:53 pm Thread Starter
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Re: LT gasping air

Ok that's what I thought. I appreciate the extra info again.

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