Follow the wires....the in-tank pump is grounded in the trunk near the access port. Can't remember where the ground for the in-line pump is.
How do you know the in-line pump is "good"? By the way, you can hear the in-tank pump "prime" -- but if the short piece of rubber hose that connects the output to the hardline in the tank has rotted away (as they do over time) --- then the pump can run while pumping absolutely nothing into the supply line. So, just because the in-tank pump is pumping, doesn't mean it's supplying fuel.
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