on a racor filter without a priming pump on it , installing a ball valve on the inlet side of the racor makes bleeding the air easer. to change the filter element, close the valve, drain the racor, & change the filter. then fill the filter with fuel, open the valve & pump the engine pump to bleed the air out at the engine filter. i have a racor 500 . it does not have a priming pump on it. i have an electric pump between the tank & the racor which makes bleeding the system easy.
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