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Old 06-23-2006, 12:30 PM
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Overkill Overkill is offline
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Question Hot Gas Tank

I took my Camaro on a road trip yesterday that lasted for about two hours. It was the longest trip that I had taken it on. Most are half hour to an hour. When I got home after the two hour drive, I noticed a weird sound. It was a low hiss that I tracked down to the vented gas cap on my gas tank. I slowly removed the cap and it sounded as though the fuel in the tank started to boil. Needless to say, that scared me a little. I touched the bottom of the stainless tank and I couldn't hold my hand there for more than a couple of seconds. There isn't any source of heat close to the tank, my exhaust dumps in front of the rear axle and isn't closet to any fuel lines. The only thing that I can guess is that my fuel pump is circulating the fuel so much that the gas isn't cooling off in the tank like is should. I run a MangaFuel ProStar EFI 600 pump that is rated at 850GPH. I bought this pump so that when I do twin turbos in the car I wouldn't have to buy a new pump. Am I thinking right that the fuel isn't allowed to cool off properly and also that the vented cap and the vent in the top of the tank aren't big enough to relieve the pressure, which is higher because the tank is so hot? It's definitely only going to be short trips until I can figure out what is going on.

I guess if I put cooling fins on the gas tank I'd have a second radiator.
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Old 06-23-2006, 01:00 PM
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Sounds like vapor lock... anyone else?
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Old 06-23-2006, 01:04 PM
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What brand is it?

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Old 06-23-2006, 01:27 PM
Matt@Lateral Dynamics Matt@Lateral Dynamics is offline
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Hey Mike, where's your return plumbed?
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Old 06-23-2006, 01:29 PM
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Wow, sounds spooky.

Fuel pump generated heat sounds like a likely scenario but I can't say with any certainty.
What is your fuel line routing like?
I sure wouldn't drive the thing till you sort it out.
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Old 06-23-2006, 02:00 PM
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Quote:
Originally Posted by chevy2boy333
What brand is it?
The guy that I bought it off of said it was a Rock Valley, but when I called them about tank straps they didn't think it was one of theirs. So, I'm not sure who made it. I don't think that the tank is causing the problem though.

Quote:
Originally Posted by Matt
Hey Mike, where's your return plumbed?
Hey Matt, Haven't talked to you in a while. How's it going? The return is plumbed back in to the top front of the tank. It's the line that goes in above the fuel filter in this picture:


Quote:
Originally Posted by Damn True
Wow, sounds spooky.
That's exactly how I feel!

Quote:
Originally Posted by Damn True
What is your fuel line routing like?
I have the pump mounted between the rear axle and the tank and it's connected to the tank with -10 braided with a filter in between. A short piece of -10 braded connects to 5/8" stainless that runs up to the front. Then braided to another fuel filter to hardline that goes to the fuel rails then back to the tank using -8 braided and 1/2" stainless. The return line follows the feed line back to the tank and dumps in to the tank through a fitting in the top-front of the tank. I have more pictures of my fuel system on my site.
Pictures of the back of the system are on this page
http://www.camaroheaven.org/modules....id=2&start=616
and for the front are on this page
http://www.camaroheaven.org/modules....id=2&start=560

Thanks for the help guys.
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Old 06-23-2006, 02:06 PM
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You've got a big pump which bypasses a lot of fuel. Compound that with the fuel running through the heated fuel rails before being bypassed to the tank. There are a couple things that would help a lot.


#1 Get the regulator bypassing before the fuel rails. That way the engine doesn't get to heat all the fuel.

#2 You may need to install a pump controller on that pump to lower the voltage during cruise/idling conditions. This creates a lot less heat in the pump and heats the fuel less.

#3 Install one of these nifty cool cans on the return line to the tank to cool the fuel!





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Last edited by camcojb; 06-23-2006 at 02:10 PM.
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