The Manatee fuel tank position and the the Volvo TMD31A. The fuel tank level is at the height of the gauge or below, that is good news/bad news. The tank level doesn't effect the gauge reading but I have to carry a small container of clean diesel fuel to refill the Racor when changing the element. The Volvo fuel pump will pull a slight vacuum when the element is getting dirty.
I thought to plumb in a fuel fill hose from my Gulf Coast fuel polisher but KISS, also the fuel tank /fuel stays so clean that I only change filter elements based on the durability of the Racor element, usually yearly. But with a single engine it is reassuring to see the gauge reading little or no restriction.