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okie dokie found the problem. the rear fuel screen/bowl "o" ring became hard and started to leak after 30 yrs. so in normal cruise setting the eng fuel pump pumps less/less pressure which allowed air to be sucked in via the top "o" ring that connect to the shaft that hooks to the sump drain cable. at t/o and climp setting it still sucked air; however the air leak is minor with the high pressure the pump is generating.
today nice tailwind prc-blh-yum 250mph
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