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Fuel tank question? Empty

Fuel tank question?

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Fuel tank question? Empty Fuel tank question?

Post  oldguy Sat Dec 19, 2020 12:47 pm

Is my thinking on this correct about this tank?   With the vent tube on the bottom of the tank, shouldn't that tube travel up to the top of the inside of the tank, to fully fill the tank with fuel before it starts to vent over, i believe it should.  This  tank  is 1" in  height, if i use a piece of wire and insert it into the vent pipe it only travels 1/2" into the tank and stops.  But the pipe is open if i blow thru it?   I have spoken to the supplier of the tank, and the response was it is hitting the fold inside the tank where the ends are folded over and solder up.   So if that's the case my understanding is the tank will vent over when it is half full am i thinking this correctly?
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Post  Ken Cook Sat Dec 19, 2020 1:48 pm

I personally open every tank by removing the back. Too many issues with all of the suppliers and some are far worse than others. If your tank is a Brodak tank, I would clean the exterior of the tank flux it where it penetrates and the pipe itself and reheat and push it all the way in. Air test under water with a 5 oz. syringe like your trying to pop it.
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Post  oldguy Sat Dec 19, 2020 1:53 pm

@Ken Cook wrote:           I personally open every tank by removing the back. Too many issues with all of the suppliers and some are far worse than others. If your tank is a Brodak tank, I would clean the exterior of the tank flux it where it penetrates and the pipe itself and reheat and push it all the way in.

It's not a Brodak tank,  for what this tank has cost me now, i should just bought a kit from brodak and assembled my own. I'm sure that is what i am going to end up doing,  but is my thinking correct though, it's going to vent fuel over, when it is only  half filled the way it is setup now? Also there is not enough pipe to just heat and push it in, won't be enough pipe protruding out for my liking. But i have some 1/8 copper pipe.
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Post  Ken Cook Sat Dec 19, 2020 2:05 pm

The overflow pipes are typically not soldered inside. Removing it should be quite easy. When you install the new one, don't leave the end inside the tank square, file a slight bevel on it so that you don't block it off.
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Post  Cribbs74 Sat Dec 19, 2020 3:51 pm

Why not get a graduated syringe and see how much it holds before overflowing? Seems to be a quicker way to see if it’s plumbed correctly.
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Post  oldguy Sat Dec 19, 2020 4:19 pm

@Cribbs74 wrote:Why not get a graduated syringe and see how much it holds before overflowing? Seems to be a quicker way to see if it’s plumbed correctly.

I can do that.
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Post  944_Jim Sun Dec 20, 2020 10:07 am

Sounds like someone short-piped the tank on that run for whatever reason. Then the vent holes could be drilled into/across the pipe just inside the tank. It is probably the one the builder intended to cap during pressure operation, or allows for different fill capacities with one tube shorter than the other. So filling from m the top tube would be different than the bottom tube (may have to invert the plane during fueling).
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Post  oldguy Sun Dec 20, 2020 12:18 pm

@944_Jim wrote:Sounds like someone short-piped the tank on that run for whatever reason. Then the vent holes could be drilled into/across the pipe just inside the tank. It is probably the one the builder intended to cap during pressure operation, or allows for different fill capacities with one tube shorter than the other. So filling from m the top tube would be different than the bottom tube (may have to invert the plane during fueling).

Jim this is a new tank.

So i did try filling the tank and it does take close to 3 0z. to fill, but i wanted to see why i can only insert the wire half way into the tank, i pulled the end cap off to see the vent tube, it has a bend in it to get around the seam, at that bend is where the wire is hitting and stopping. So onto installing the tank and finish sheeting the tank wing area.
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