Why doesn't the vent line connect to the line that goes out the tank? - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
 
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post #1 of 2 (permalink) Old 08-21-2015, 10:47 PM Thread Starter
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Why doesn't the vent line connect to the line that goes out the tank?

Replacing my aging LT1 stock pump with a racetronix. In the pic attached, the line with a 90 on it is the vent line within the sender. Why doesn't it connect directly to the pipe going out the top for vent? There is actually a plate over that pipe (with a 1" gap) that even prevents me from attaching it.

Is it because it naturally vents out the line due to pressure?
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post #2 of 2 (permalink) Old 08-22-2015, 07:23 AM
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Modern fuel systems are not vented to atmosphere. I would say that line allows venting air into tank. The venting lines going out of sender go to charcoal canister, then from canister to intake.

That way fuel vapor is contained and burned in engine. Tank still gets venting air in, but no air out to atmosphere. Pressure in tank gets relieved by going to canister then to engine. This is why gas cap makes noise when you remove it sometimes.

Last edited by cocobolo95; 08-22-2015 at 07:26 AM.
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