You know what I'd do , I'd toss a (cheap/readily available) parts house pump on there right now with a fitting or two to mate it up with your lines & take her out for a spin & that'd tell me if it is or is not the pump then go from there
live every 24 hour block of time like it's your last day on earth
, I'd toss a (cheap/readily available) parts house pump on there right now with a fitting or two to mate it up with your lines & take her out for a spin & that'd tell me if it is or is not the pump then go from there