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The lines on the supply side of the injection pump are 1/4". I have stopped using the 3.5mm return line and I now use conventional 1/8" fuel line. Its harder to put on but I think it will last longer than the OEM style return line.

It’s 1/4”. I cut the crimps off with a dremel. Seems to be the easiest way to get the old lines off.

If it won't pull a full load run it as high a load as it can while maintaining RPM. If its wetstacked it will smoke a lot. Once the smoke clears add load till it stumbles then back it down a bit. Repeat this pattern till it will handle a full load. Don't forget to let it cool under light load...