On my Haulmark ( Freightliner) if I fill one side right full by the time I slide the hose underneath to fill the other side (my favorite station is only single side) the first tank will have dropped a couple of inches, even with the engine off. All of the big trucks (Peterbilt, Kenworth, Western Star, IH) I have driven were the same.
There are no pumps just a Tee fitting with equal length hoses (very important) and it works on the siphon principle.
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2007 Haulmark 3329DS, Freightliner Coronado Chassis, 515hp Detroit, Meritor Freedomline 12speed Autoshift, 10kw Generator, In-motion Satellite.
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