If the new tube can be fabricated I would still consider brazing.
To butt-join two tubes I'd find the next size of tubing and make a sleeve - similar concept to copper sweat-solder coupling, although I would use steel.
If you have to go back to the end block on the pump, I'd carefully bore or ream the block for a very close fit (tap fit, very slight press) and then braze. Tig welding is always a possibility (the demo pieces are out there of aluminum pop cans and gum wrappers tig welded together) but a greater skill level would be required...brazing is going to be a process that's much more forgiving with a thin section in my opinion.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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