SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: TJS Nordic on April 05, 2008, 01:11:38 PM
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I decided that the small pickup tubes in my tanks(alum) are not going to cut it for the future EFI blower project. So I cut a 3" round plate with a cool SPI trepanning tool on the Bpt. out of some .090 alum. I then drilled the holes for the -12AN bungs. I offset them because I am going to also run a vent system as well. The aluminum bung for the vent will be 1/4 NPT. I do not have any of those so I might just make some. I tigged the -12AN bungs on. That is how far I am right now. I have some tubing I am going to weld on the backside of the fitting but I cannot do that yet till I am ready with the tank to get the length for the tube just right. Seems kind of overkill large but I had -12AN bungs on hand so I used them. I will post more pics as I progress.
T.J.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup01.jpg&hash=8cbef3e8c71ca77fa9bad915b2cc5afdc836be00)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup02.jpg&hash=ddbe76fdead0b22ab060164b9bbd298068f7f968)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup03.jpg&hash=397e9f687ef3355cb349f5b58f1f68abc2bc02ea)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup04.jpg&hash=a240a81931a6aa48488272bf6d2131e5fcdec3d3)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup05.jpg&hash=7783075e8b7f547f9da5ea258675c55e5cae6621)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup06.jpg&hash=f3a11cb91daed3ade03c1b19f69fe5ad04f517f8)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup07.jpg&hash=6dbea5ef06deae35e837dd2bf67ed8584b2e33ac)
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Worked on these more today.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup08.jpg&hash=8091f69deee367940723730d5beecbf6c9c32417)
This first pic shows the 3/8 NPT bung I am going to use for the vent. I turned a shoulder on it so I could weld in from the back-side. I did not want to weld it from the top because it was very tight next to the other fitting. Notice the -12AN fitting has specs in it. This happened when I welded it to the plate. I guess this alum. had some impurities in it. I have to polish it off.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup09.jpg&hash=deb0a7294fe5ebd86ea8e15ba963eaf31876fb9a)
Here it is welded from the back.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup10.jpg&hash=60874fc4d4d7d2a4d78fd4d39c15c3010e24926c)
Getting ready for the large pickup tube. Jigging up alum. is sometimes a real pain. I had to line up the inside hole and not move it when tacking. I was looking for a long threaded rod to "squeeze" everything togehter but did not feel like looking for it. So I just tacked it.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup11.jpg&hash=893d169fa8f1f9ca966c082652536fa17d531db9)
A few minutes later all welded up.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup12.jpg&hash=3e1a1d8536f8e0da54d1544f2c8437ba457142ac)
All nice nice.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup13.jpg&hash=a401a32e3e30ee34bd1cba5017f90c66b304d692)
You can see the wriitng on my welding JIG. These are the settings so when I do the other one I do not have to play around with settings. My machine has memory settings as well.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup14.jpg&hash=b5b126c91275d182c2d3071df8a6efb71a2981c8)
I almost broke my wrist cutting this hole with the 2.75" hole saw.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup15.jpg&hash=433192cf329d1d6ea4bb15f975d6b504aab3a18a)
Here you can see the difference between the stock and the new pickup. The ID of the new one is almost .700"
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup16.jpg&hash=ab5e73ba5531c987fd3bb916594d53201c214652)
Just another shot of the size.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup17.jpg&hash=a5c289b18849c3c95c71db5a1ab3fd8c9518ffcc)
I had to hammer a little curve in the plate. Also there is a plate/baffle welded in the tank I have to "adjust" to get the new pick-up to fit right.
Stay tuned for welding the pickup on the tank.
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Cool step by step, looks good. You got watch out for that 1/2" drill with a hole saw on the end of it don't you. ;D
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I finished welding the large pickup to the tank saturday. I purged it with argon while welding. I then pressure checked for leaks. I put about 4 psi to test. I spayed soapy water on the joints. The plate welded to the tank had no leaks. However, I did find a leak at the 3/8 NPT fitting where it was welded from the backside. So I had no choice but to weld now from the top side (see third pic). This was a real PITA. I had to stick out the tungsten far to get in-between the two fittings without hitting. I was able to make the seal. Re-pressure checked it and all is good. Now to finish the second tank. I made this pressure testing JIG for testing tanks.
T.J.
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup18.jpg&hash=3cb78d3c280c60c2779e1f631103019cacee0100)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup19.jpg&hash=c8adb2977c6bf6b84dc86fdec7d2f800624c5dc8)
(https://www.socaljetboats.com/proxy.php?request=http%3A%2F%2Fwww.tjsperformance.com%2Fimages%2Ffuel_pickup20.jpg&hash=6363e225f374b5921f236d8aa60335737192f25e)
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Looks like TJS has too much time on his hands.....nice work
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nice work