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  #21  
Old 09-28-2010, 09:13 AM
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Joe Llamahead Joe Llamahead is offline
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I've gotta build a tank for a buggy, aluminum is the easist for me to scrounge and work so thats what bIm gonna use. I can deal with fuel lines and venting but in perplexed about the filler/cap .........what are guys using for filler neck/ cap ect?
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  #22  
Old 09-28-2010, 11:03 AM
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Quote:
Originally Posted by Joe Llamahead View Post
I've gotta build a tank for a buggy, aluminum is the easist for me to scrounge and work so thats what bIm gonna use. I can deal with fuel lines and venting but in perplexed about the filler/cap .........what are guys using for filler neck/ cap ect?
My current tank has welded on pipe threaded bungs, I believe 2" for the filler, and I made 1/2" pipe for the outlet and return.
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  #23  
Old 09-28-2010, 11:32 AM
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CarterKraft CarterKraft is offline
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Quote:
Originally Posted by Joe Llamahead View Post
I've gotta build a tank for a buggy, aluminum is the easist for me to scrounge and work so thats what bIm gonna use. I can deal with fuel lines and venting but in perplexed about the filler/cap .........what are guys using for filler neck/ cap ect?

There are a ton of options for fillers. these http://www.speedwaymotors.com/Produc...+bung&deptId=0 come to mind.

There are also simpler versions like E said, weld a 2" pipe nipple to the tank and then screw on a 2" female cap. This method is likely stronger in a rollover and will not leak but will require external venting of the tank with a rollover valve and plumbing.
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  #24  
Old 09-28-2010, 12:08 PM
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Just thought I'd throw this article out there from Street Rodder Magazine showing how Rock Valley builds their tanks. I've been pondering making something similar for my Nova, although I'm limited on sheet metal tools and I have no skill welding stainless.

What do you guys think of the baffling system they use?

http://www.streetrodderweb.com/tech/0909sr_building_a_custom_gas_tank/index.html
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  #25  
Old 09-28-2010, 01:07 PM
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Wheels4 Wheels4 is offline
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I thought there would be an explanation in that article, but there wasn't.... what is the point of having a baffling system in a gas tank?
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  #26  
Old 09-28-2010, 01:25 PM
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Quote:
Originally Posted by Wheels4 View Post
I thought there would be an explanation in that article, but there wasn't.... what is the point of having a baffling system in a gas tank?
To keep fuel around the pickup when under acceleration (cornering, hard acceleration or braking, angular shifts, etc). This becomes more important as the fuel level drops and it's arguably more important for a fuel injected engine because fuel is constantly being recirculated whereas the carburetor bowls act as a surge tank of sorts.
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  #27  
Old 09-28-2010, 01:32 PM
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Originally Posted by TheBandit View Post
To keep fuel around the pickup when under acceleration (cornering, hard acceleration or braking, angular shifts, etc). This becomes more important as the fuel level drops and it's arguably more important for a fuel injected engine because fuel is constantly being recirculated whereas the carburetor bowls act as a surge tank of sorts.
cool... thanks.
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  #28  
Old 09-28-2010, 01:33 PM
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Quote:
Originally Posted by Wheels4 View Post
I thought there would be an explanation in that article, but there wasn't.... what is the point of having a baffling system in a gas tank?
Controls sloshing in the tank to keep fuel at the Pickup and to constrain having a significant amount of weight moving around in the tank.
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  #29  
Old 09-29-2010, 12:20 AM
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the tank im currently using has an almost identical baffle setup. I Made the same left/right pieces, just not the front/back piece. I also made the holes smaller so the flow is slower. But, im in a buggy and not a race car. Works better than i thought it would. Even at nearly rollover angles.
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  #30  
Old 09-29-2010, 01:18 AM
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Thanks Guys! as usual I was overthinking the whole thing .......
some ez solutions
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  #31  
Old 09-29-2010, 09:36 AM
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Graham08 Graham08 is online now
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Quote:
Originally Posted by TheBandit View Post
Just thought I'd throw this article out there from Street Rodder Magazine showing how Rock Valley builds their tanks. I've been pondering making something similar for my Nova, although I'm limited on sheet metal tools and I have no skill welding stainless.

What do you guys think of the baffling system they use?
I think their baffles look good. Plenty adequate for street/performance use.

I think that long term, you will like that arrangement better than foam. Foam is okay for racing use, but is a constant maintenance headache. None of the cars I've worked on use it because the foam (even "alky safe" foam) and methanol don't play nice together...I would expect the same from ethanol and all of the other nasty stuff in pump gas.
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  #32  
Old 10-11-2010, 06:14 PM
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protodie protodie is offline
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Wheels,
we use 5052 aluminum and baffles like the example shown earlier for fuel cells.
I use .125 thick,,,which may be overkill,,,but it sure tig welds nice

The fuel cell we build is designed with a sump and baffle plate.

I pressure test each one to make sure there are no pin hole,,leakers.
Soapy water 1st and look for "suds" bubbling from any sort of pin hole.
If it passes the bubble test, then I pump it up to 5lbs and let it sit,,,,,,,,,,,,,,check it again later to see if there was any pressure lost.

Filler necks and caps can be purchased thru Summit, Jegs for bolt on.

I use all aluminum ones from Pro-werks and EMPI and weld them in.

I modify / machine the caps to install a roll over vent into.

The roll over vents we use screw together, so they get installed in the cap,,,,where you can hold both sides to tighten the roll over vent

When they are done, I get them powder coated

This is on our larger cars.

On the kids cars, running the 6.5 like your camp ground cruiser,,,we make much smaller tanks with the same caps , roll over vent,,,,but then just a threaded bung for the fuel line


It's been a awhile,,,,,,,,,,,not seeing where to upload photos?
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  #33  
Old 10-11-2010, 06:22 PM
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Wheels4 Wheels4 is offline
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thanks for the info Proto... i appreciate it. I ended up going with the stock gas tank for the camp ground cruiser.
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