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Old 09-10-2010, 07:06 PM
fourspeedwagon's Avatar
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Gassy air but no fuel through line

Car is my 64 chevelle wagon. Been sitting a while. I used my air compressor to blow into the gas tank. Up at the fuel pump, all I get is air that smells like gas but no gas. I pulled the pickup out of the tank to see if it rotted off, but no. It has almost 5 gallons of fuel in the tank and I have not seen any signs of leakage. How can the air come, but not the fuel? Thanks in advance- Greg

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Old 09-10-2010, 07:18 PM
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If there`s a hole in the line all you`ll get is air but no fuel. But also if the tank has a purge line or a vent you can pump all the air you want in the tank and it won`t make any difference as that`s where your air is escaping.
I`m not sure what year purge lines were added or how they vented the tanks in those days but usually a tip valve was used in case the vehicle tipped over so it wouldn`t leak fuel.
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Old 09-10-2010, 07:40 PM
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Sounds like the vent line is at the fuel pump instead of the fuel line but then you would have fuel coming out of the other line onto the ground . Hmmmm . Just thinkin'
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Old 09-10-2010, 08:00 PM
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Hi,
The 64 chevelle gas tank is vented.
Rich
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Old 09-10-2010, 08:34 PM
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Quote:
Originally Posted by richard stewart 3rd
Hi,
The 64 chevelle gas tank is vented.
Rich
Yeah , I know . That's why it doesn't make sense . It sounds like coming out of the vent line , but like you said .....Can't be. Did right by checking the pickup tube . I don't understand how it can happen if everything is up to snuff inside of the tank .
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Old 09-11-2010, 06:42 PM
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I think I see what Rich is saying- I won't be able to build any pressure to push the fuel forward because the tank has a vent, right?


Here's a snap of it from when the engine just was going in..
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Old 09-12-2010, 12:50 PM
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Hi,
That's correct.
On some 64s along the line from tank to pump, there is a rubber hose you might want to check that out. Did any gas drip when you disconnected the line from the pump? have you tried pumping air from the pump end of the line to the tank?
Rich
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Old 09-12-2010, 01:26 PM
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The rubber hose can dry out and suck air instead of fuel
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