My advice, remove the line after the fav, connect another longer line, run into cabin into a clear container. Take car for a boot and see if meth actually flows and see if dash lights up. In my case, issue was defective c-clamp on flow sensor. I ran a trunk mounted kit.
When I went for a drive, my meth flowed just fine but the sensor didn't log any flow. I did some troubleshooting and bought spare fav, spare pump, new lines, relays, and finally c-clamp wire which resolved it for me.
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