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I don't see why the OP is adverse to using a mechanical fuel pump with return line. Even Parflex would be fine here. Probably polypropylene or polyethylene if temperatures are appropriate. A singe Facet pump would work fine given the NPSH afforded by gravity.

The injection pump NEEDS constant flow to cool and to keep prime. If you dead end the injection pump at the end of a pressurized line, there is no means to prime the system. With return to day tank, any air will be purged. Run pumps as designed and a return fuel line to the storage tank. But...