69 GTO Gas Leak - Pontiac GTO Forum
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post #1 of 9 (permalink) Old 07-20-2014, 01:12 PM Thread Starter
 
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69 GTO Gas Leak

When I accelerate quickly gas leaks out of the tank at the back behind the license plate. I've tried different gas caps and it still leaks. Not drops of gas but a stream. I probably lose a gallon of gas out the back for every full tank. Any suggestions?
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post #2 of 9 (permalink) Old 07-20-2014, 01:17 PM
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Check to make sure your vent is connected properly. There should be a flexible hose that connects to the side of the filler neck and connects to a vent tube that goes up above the filler neck, makes a loop, and comes back down. Losing fuel like that on acceleration just about has to be coming from one of three places:
1) Around the gas cap.
2) Through that vent.
3) The filler neck itself is leaking.

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post #3 of 9 (permalink) Old 07-20-2014, 02:50 PM Thread Starter
 
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I know it's coming from around the gas cap & I've tried a vented gas cap & I have a non-vented on it now. It still leaks no matter which one I use.
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post #4 of 9 (permalink) Old 07-20-2014, 03:54 PM
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Then I would say either the seal on the caps are bad or the end of the filler neck is not flat. Did you check the vent tube?
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post #5 of 9 (permalink) Old 07-20-2014, 05:06 PM Thread Starter
 
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The caps I've tried were new. Not 100% sure the filler tube is flat. But I can tell it's coming from the bottom.
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post #6 of 9 (permalink) Old 07-20-2014, 05:08 PM Thread Starter
 
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Gas leak

The bottom of either the cap or the filler tube.
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post #7 of 9 (permalink) Old 07-20-2014, 06:05 PM
 
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These are photos on my '67 vent tube. If you have one, maybe the hose is oof? That would explain it. Very hard to see.

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post #8 of 9 (permalink) Old 07-22-2014, 08:00 PM
 
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Vent X2

1968 Pontiac GTO
1983 Pontiac Bonneville (G) wagon
2008 Pontiac G8 base
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post #9 of 9 (permalink) Old 07-25-2014, 07:32 PM
 
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My car did the same thing when I first got it. It was the vent hose. Make sure it loops up above the filler neck and it doesn't have a hole in it.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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