I'd go the route that John and Angela did. Find a local, reputable, mechanic willing to work on your DP, who is highly recommended working on diesel IP fuel suppply systems.
McMaster-Carr should have good prices on the proper, high quality, fuel lines. Their shipping use to be very fast, but it has been a while. The mechanic should be able to advise you with the proper ones. You use to have some really super good diesel mechanics down your way in Florida, but the ones I could have recommended are long over the hill, I'm afraid. Most folks today would have been afraid to go to them cause they worked out of tents in the back yard, but they could really do things with diesels!
Be glad yours runs from the rear bulkhead to the lift pump. Mine runs from the rear of the front bulkhead all the way back.
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