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You pulling straight from a jug of fuel into the lift pump?

That doesn’t sound good. Maybe pump the primer with the overflow out, and see if a bunch of junk comes out the galley. If so you’re probably out of my league, hopefully Will Wagner will chime in before you pull the IP. Did you try cracking the injector lines to see if you where getting fuel out?

Tie the fuel shut off back, hold throttle wide open and try. Did you end up replacing the overflow valve also?

You can actually run without it, but if your overflow valve or checks in the lift pump are starting to fail it can help prevent loosing prime. Did you try pinching the return line off to see if your still loosing prime? I’m leaning toward the overflow valve, but you need to find out why you’re...

Does your return line in the tank still have the rubber dip hose on it, and did you put a new or used lift pump on?