I don't believe that if you are running regular pump diesel. Regular fuel line and o-rings that work for gas, work for pump diesel fuel. Now if you are running some other concoction of fuels, that may be a different story.
It may work for awhile, however, like the addition of alcohol to gasoline creating goo out of every o-ring in an older gas system, care must be done when planning replacement of parts to insure they will indeed hold up.
Both plastic and rubber based fuel lines are made for their specific uses.
Having said that, there are dual use fuel lines for example. The A1 rated fuel hose can handle either fuel, however, once you introduce something else, as you suggested, say like reacted veggie fuel(Many diesel facilities have added to their fuel supply streams like ethanol to gasoline), it may adversely affect the longevity and reliability of the product.
Whether or not those fuel senders are dual fuel compatible, I can't tell you.
BUT!
What I do know is, both the gasser and diesel 19 gallon fuel tanks spell out different part numbers for the senders of mechanical fuel pump models, although they appear similar on the outside.... are they really the same? The diesel sender even spells out "Diesel" in the description.
Both 19 gallon fuel tanks themselves can be used for either gasoline or diesel, also indicated by the part numbers, and that same tank fits both systems. It's the senders that are different.
Just sayin'!
I'm all about helpin' a bruthah out, but there are things in the other wet community I've seen, that makes my neck fur stand up on certain issues... this is one of them times. I'd rather be certain, it's a lot of trouble to replace one of those buggers.
I'm not trying to call anyone out, just my own intuition "and" lack of knowledge on these parts thinking out loud. Plus I'm highly interested because my fwd fuel tank is reading zero too! Although in my case, I think it's more a loose float issue- won't know until I pull it apart- than it is a ohm's issue. I've seen those particular floats dislodge before....yeees, got 'em in the boat side too. A standard wine cork can cure that problem.....and yes.... those are proper floats from factory on most fuel floats whether gasoline or diesel. The metal ones actually fail more frequently because they're looped/clipped around v. rod stuck through center.