Fuel Tank Leak - Team Camaro Tech
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post #1 of 5 (permalink) Old Sep 16th, 10, 08:43 AM Thread Starter
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Matt
 
Join Date: Jan 2004
Location: Saint Marys, GA
Posts: 282
Fuel Tank Leak

So, I have a 69 Camaro, carberated with and electric fuel pump. The tank is completely new as well as the sending unit and all. Two days ago I filled up the tank about as full as it could get and drove about 3mi and parked it. I havent driven since. This morning I went out to the car and noticed a dryed puddle of fuel under the rear of the car. I looked under the car and saw a drop of fuel on the tank. Why would this be happening? Could the tank have been too full and the heat of the day (mid 80s)caused the fuel to be forced out of the seal for the sending unit in the top of the tank?

Thanks for the help!

Matt
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post #2 of 5 (permalink) Old Sep 16th, 10, 10:32 PM
Jon
 
Join Date: Sep 2001
Location: Oklahoma
Posts: 27
Re: Fuel Tank Leak

Maybe there is a small hole in the tank. Where was the drop of fuel coming from?
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post #3 of 5 (permalink) Old Sep 17th, 10, 08:28 PM
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Mark
 
Join Date: Apr 2006
Location: Minneapolis, MN
Posts: 119
Re: Fuel Tank Leak

I had a Chrysler with an electric fuel pump, saw a leak very much the same way. What happened was the fuel pump pressurized the fuel line even after the power was cut, to the point of the line failing where it attached to the pump. The drops seen on the tank were the result of "capillary action" where gas ran from the single leak point, along the short rubber line, to the tank surface underneath. At the end of the day, a few tightening turns of the hose clamp sorted it out.
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post #4 of 5 (permalink) Old Sep 17th, 10, 10:27 PM
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Steps
 
Join Date: Dec 2005
Location: New Zealand
Posts: 13,321
Re: Fuel Tank Leak

It is not ggod to over fill a tank...for just this reason.
Even so are you 100% sure the gasket under the fuel tank sensor is sealed?
Is the rubber tube for the fill made of the correct and suitable compound?
And the ends sealed?
Is the tank cap the correct on and rubbers in good nick and the vent not blocked

My Spelling is not incorrect...it is creative

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post #5 of 5 (permalink) Old Sep 18th, 10, 06:41 PM Thread Starter
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Matt
 
Join Date: Jan 2004
Location: Saint Marys, GA
Posts: 282
Re: Fuel Tank Leak

Thanks guys. the leak seems to be coming from the top of the tank and the drop is on the front of the tank, coming from the top. Its nowhere near the fuel pump. Could the fuel be coming from the vent if the tank is too full?
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