Join Date: Jul 2000
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Re: air in the line when emptying separator bowl
If your Racor is near the very bottom (altitude) of the fuel delivery tubing arrangement, when you open it and any of the line 'drains back', any air that now enters the opened connections will gravitate towards and accumulate in any high spots in the line, etc. This accumulation of air 'in the high spots' can be a bugger to bleed out. If so, make sure there is a gentle slope of the piping 'up' toward the 'next' bleedable element in the system; and, after 'messing about' with an opened Racor, etc. WAIT for many minutes so that the air bubbles have time to migrate 'up' to the 'next' bleedable device (usually the engine guard filter).
BTW the Racors (with water removal sumps) 'should' be at the very bottom of a delivery system to remove any water by the same mechanism of gravity settling.