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  #16  
Old 08-08-2011, 10:32 PM
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Originally Posted by TheDon View Post
Did it make a noise at all?
Don, Bone's car is so quiet you could hear a silent fart at 80 mph. I know because I drove it.

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  #17  
Old 08-08-2011, 10:33 PM
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Originally Posted by vstech View Post
it's actually amazing how little vacuum it takes for the atmosphere to crush a steel can.
8 to 10 inches of vacuum should be enough to allow that flat long tank. I should put a gauge on one of mine, and measure how much vacuum it takes to collapse it.
heck, I ought to video the procedure...
Take a 50 gal drum & put about 10 gal of water in it. Dont put the bung in! Put it on a fire & get the water boiling real good. Pull it out of the fire & put the bung in. Turn the garden hose on it & cool it down. It will end up as flat as a pancake.
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  #18  
Old 08-08-2011, 10:38 PM
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Originally Posted by layback40 View Post
That is one tough lift pump you have !!! Sick ones would not pull the skin off custard.
I guess though that the low pressure was all the way around the fuel system so it was your IP high pressure elements doing the work.

I have seen fuel tanks expanded a little with air pressure to increase their capacity. You are lucky it didnt go bang !!
As a kid we once piped up 150 # to a 50 gal drum for fun. We ended up with 3 sheets of flat steel & a hole in the shed wall. Lucky we were not hurt. Our ears were ringing for a few days & our backsides were sore after dad found out what we had done !!!
That's why I did it through the fuel filler with a rag wrapped around the blow gun....you can't get a prefect seal. Doing it through the vent with a cap on would be begging to split the tank pinch welds.
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Last edited by boneheaddoctor; 08-08-2011 at 11:04 PM.
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  #19  
Old 08-08-2011, 10:39 PM
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Quote:
Originally Posted by vstech View Post
it's actually amazing how little vacuum it takes for the atmosphere to crush a steel can.
8 to 10 inches of vacuum should be enough to allow that flat long tank. I should put a gauge on one of mine, and measure how much vacuum it takes to collapse it.
heck, I ought to video the procedure...
I've done the test. 3 to 4" of HG is all that's needed to start collapsing a 55 gal steel drum. It's the wrong shape to withstand vacuum, flat sides, unsupported. If it was a sphere or egg shape it would withstand much higher vacuum.
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  #20  
Old 08-08-2011, 10:55 PM
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want to see a really impressive imposion http://www.youtube.com/watch?v=E_hci9vrvfw

also

http://www.youtube.com/watch?v=Uy-SN5j1ogk&NR=1
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  #21  
Old 08-09-2011, 03:31 AM
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Quote:
Originally Posted by vstech View Post
it's actually amazing how little vacuum it takes for the atmosphere to crush a steel can.
8 to 10 inches of vacuum should be enough to allow that flat long tank. I should put a gauge on one of mine, and measure how much vacuum it takes to collapse it.
heck, I ought to video the procedure...
Actually 2 inches ( 1 psi vac) should be more than enough to flatten a tank that size. The area of the side is ±550 inČ - that's 550 lbs pressure from both sides! I guess that you could just about do that with your mouth. Anyone like to try what they can pull on a Mitty-Vac????
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  #22  
Old 08-09-2011, 05:09 PM
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Mine was plugged up with dried mud...I think from one of those black Mud Dauber wasps. The 123 has a vacuum/pressure differential check "Check valve". Opens at pressure of 30-50 mbar and at a vacuum of 1-30 mbar in fuel tank.
I cleared mine with a compressor blow gun. I then put some screen material over it and held the screen on with a hose clamp.

Now I need to unclog my tank strainer.
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  #23  
Old 05-13-2013, 09:40 AM
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heh, I never did that video... I may do it sometime in my spare nothing else to do time...

I now have several fuel tanks sitting around... one already collapsed that I blew back up.
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  #24  
Old 05-13-2013, 11:41 AM
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I had this happen in my 1968 W110 200D... I just had the fuel tank "professionally cleaned" at a radiator shop. They were supposed to boil out the tank, but I guess all they did was put gravel in it and shake it.

After I installed the tank, I remember that every time I would open the fuel cap, I had to pull really hard on it, then suddenly it would release and I would hear a WHOOSH and popping noises from the tank as it came back to shape.

I checked the vent, and it was clogged with mud. After this point, no more problems.

I do remember that I had an issue with a clogged secondary fuel tank in a gasoline-powered 1965 International Travelall, but it would only run on that tank for about a minute before the engine would stall.

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