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sounds like a simular set up to mine and mines situated outside inbetween the shower and sink waste outlets

and yes you prime with the foot pump then lecky pump takes over

On mine the 2 outer ones are slightly larger there the waste water the middle one is inlet i just drop a water pipe in to water but, pump a little until the foot pump feels harder turn on the tap and test if its full of air this should come out i also have to sometimes pump it again

if youve not already done so maybe worth draining the carver system (if it has one) and flushing it through