Diesel newby here, had the truck for 3 months, truck wouldn't start, was "advised" the problem was clogged filters in the tank sending unit, dropped tank, filter housing empty, seller said he removed them because they clog up easily "don't need them". Small orange rubber joker-valve bad, replaced it. Needed 15 gallons of fuel before the filter can would fill with no bubbles. Now, if it sits overnight, the fuel level in the filter can drops down far enough that it won't start without a re-fill from the pump. Help appreciated!