Carbon canister connections
#1
07-29-2010 | 07:04 PM
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From: Santa Ynez, Ca
Carbon canister connections
Getting ready to install an oil cooler and after "relocating" the canister I began to wonder about the tube that vents the tank. Are the fumes released into the canister to be scrubbed by the charcoal and then released into the tube that vents into the air or are the vented fumes sucked into the air cleaner by the tube that connects to the air cleaner?
#2
07-29-2010 | 07:59 PM
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From: England via the US
#4
07-29-2010 | 08:36 PM
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From: Santa Ynez, Ca
Well, I'm certainly going to relocate the canister but I was still wondering just how it works. The large tube on the right is open to the air, one tube on the left goes to the a/c tract and one tube to the tank. Am I correct to assume the tank tube sucks in air as the tank drains or is the tube just an overflow vent to the outside and the tube in the intake tract must be under a vacuum due to the venturi effect of the intake? I quess my question really is how exactly does the system work???
#5
07-29-2010 | 09:01 PM
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From: From Long Island, now in So. Cal
Well, I'm certainly going to relocate the canister but I was still wondering just how it works. The large tube on the right is open to the air, one tube on the left goes to the a/c tract and one tube to the tank. Am I correct to assume the tank tube sucks in air as the tank drains or is the tube just an overflow vent to the outside and the tube in the intake tract must be under a vacuum due to the venturi effect of the intake? I quess my question really is how exactly does the system work???
"How does a Carbon Canister Work?
When the vehicle is shut off, there is a pressure imbalance within the fuel tank caused by fuel being siphoned out, but no air being let back in to take up the empty space. The lower pressure in the gas tank promotes a greater rate of evaporation, letting some of the fuel become a gas. Eventually the tank's internal pressure equalizes, at which point the gas leaves the tank through the vent port and goes into the carbon canister. It's trapped there by the properties of the carbon within the canister, keeping it from escaping into the air. When the vehicle's engine starts, the sudden suction created along the intake manifold opens up the purge valve and pulls all the gaseous fuel out of the canister and burns it in the engine. The canister goes unused until the car is turned off again."
Removing the vapor canister:
The single hose on the right side of the bike from the vapor canister goes up under the tank and doesn't connect to anything it is just a breather hose you can just pull it out.
On the left side of the bike you have two hose's coming off of the canister. The canister is labeled carb / tank, disconnect the tank hose and follow it up the frame to a little vapor valve, remove hose from the bottom of this little vapor valve and remove the hose. This is now your 49 state tank vent, you can also get the 49 state vent hose that connects to the vapor valve and runs up under the tank, it is in the Harley parts catalog (99439-06A) item 13 on page 90 P/N 27296-04A TUBE, VALVE TO ATMOSPHERE and a retaining clip item 7 P/N 10113 CLIP, DOUBLE HOSE.
Disconnect the carb hose from the vapor canister, this line goes up the frame and under the tank to a connection behind the top left side of the air cleaner, it connects to the intake manifold, disconnect and put a cap on the port of the intake. (In the Harley parts catalog (99439-06A) on page 20 they list a cap plug item 21 P/N 90383-98 CAP PLUG, INDUCTION MODULE that might be the one to use.) This hose is difficult to remove, I took off the rubber hose from the plastic tube by the intake and pulled the hose out from the front of the tank and broke off a clip that supports a harness that comes out of the bottom of the tank, but I was able to ty-wrap that harness to another harness under the tank near the frame. If you cut the plastic tube end off that has the ridge, it will not hang up on anything and it will just slide out.
The vapor canister bracket has a clip that you depress and then the canister can slide off the bracket. Loosen the two allen head bolts that hold the bracket on to the frame, remove top bolt then rotate bracket and put the bolt back in and tighten it down, then remove lower bolt and bracket, reinstall lower bolt and tighten it down.
The single hose on the right side of the bike from the vapor canister goes up under the tank and doesn't connect to anything it is just a breather hose you can just pull it out.
On the left side of the bike you have two hose's coming off of the canister. The canister is labeled carb / tank, disconnect the tank hose and follow it up the frame to a little vapor valve, remove hose from the bottom of this little vapor valve and remove the hose. This is now your 49 state tank vent, you can also get the 49 state vent hose that connects to the vapor valve and runs up under the tank, it is in the Harley parts catalog (99439-06A) item 13 on page 90 P/N 27296-04A TUBE, VALVE TO ATMOSPHERE and a retaining clip item 7 P/N 10113 CLIP, DOUBLE HOSE.
Disconnect the carb hose from the vapor canister, this line goes up the frame and under the tank to a connection behind the top left side of the air cleaner, it connects to the intake manifold, disconnect and put a cap on the port of the intake. (In the Harley parts catalog (99439-06A) on page 20 they list a cap plug item 21 P/N 90383-98 CAP PLUG, INDUCTION MODULE that might be the one to use.) This hose is difficult to remove, I took off the rubber hose from the plastic tube by the intake and pulled the hose out from the front of the tank and broke off a clip that supports a harness that comes out of the bottom of the tank, but I was able to ty-wrap that harness to another harness under the tank near the frame. If you cut the plastic tube end off that has the ridge, it will not hang up on anything and it will just slide out.
The vapor canister bracket has a clip that you depress and then the canister can slide off the bracket. Loosen the two allen head bolts that hold the bracket on to the frame, remove top bolt then rotate bracket and put the bolt back in and tighten it down, then remove lower bolt and bracket, reinstall lower bolt and tighten it down.
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