Not Ranked
I believe that you have a new vehicle----many times I have seen crud from new tanks, lines, etc that will accumulate in an restriction( you said 1/2 necked down to 3/8) or turn. These accumulations will relax some when the system is deactivated and will gradually re accumulate after a few minutes on the next startup.--try blowing out the line from the pump toward the tank
Jerry
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