ever been at a fuel pump station that sells both diesel and gas and look at the hoses...
goodyear flexsteel is the type used at the filling station nearest my farm.
It mentions 'GAS' ont he hose and some pressure and size specs.
when you go to goodyear and look up the hose.. you fid it is good for a huge range of liquids, including oil, diesel, kerosene, some organic solvents.. etc.
A quick check of parker fuel dispensing hose revealed this: ( even their cheap non pressure / no vacume gravity feed 7174 hose lists these fuels! )
Biodiesel (to B20 in dedicated service), diesel, ethanol, gasoline, oil
The common dayco b7/tc4 hose that is often seen on pumps ALSO lists these same fuels.
cursory look on napa's site shows their bulk 'fuel hose' meets:
SAE 30R10 specification and is capable of handling gasoline, alcohol-extended gasoline or diesel fuel, Utilizing a special compound called Fluoroelastomer (FKM), which resists gas permeation and retards aging, and aramid-fiber reinforcement
If your napa sent you away because they don't think they sell hose rated fro diesel.. it simply means they do not read the specs on the stuff they sell...
I will note that vapa ALSO sells plain black rubber vacume hose.. and that stuff is NOT rated for any type of solvents of fuel and WILL degrade pretty quick.