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Old 05-17-2012, 07:32 PM   #7
volvoman
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Join Date: Aug 2009
Location: Rockford
Posts: 490
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newer trucks have a suction and return line through both tanks about a 1/4 way up from bottom of tanks. a pickup tube goes down inside tank to about 1" off bottom. returning fuel goes through a valve with a ball in it. ball rolls back and forth depending on which return line has the most pressure. about like blowing through a straw. if ball sticks or freezes it will return all the fuel to one tank. that tank will over flow and other will run out of fuel killing engine. so your generator could lower that tank but when you start driving it should equalize again. if one tank is mounted higher it can cause a problem also.
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