Need help on this one. Am replacing rubber lines from fuel filter assembly across top of engine block, and inlet line on fuel filter assembly. Have read many threads, and think this one is a 7/16" line. Am I correct, or is it the 1/2"? Also, what PSi rating is needed for this line?

checked with a couple of parts stores nearby, closes they carry is 7/16" fuel injector line, nothing that shows that it is a diesel line. Is this the same, or do I need to get to the dealer for the replacements? Or a vendor online?

Thanks for any help!

unless you have a lift pump you wont have any psi, it'll be vacuum. I believe they are all 1/2in except for the fuel test port hose, and the hose going from the y-junction to the fuel pump. If its rubber any fuel line will do. I've replaced all my hoses because of dry rotting.

Thanks/ This answered everything I needed. Pretty sure that is what I am having, after 9 years, is dry rotting and small cracks allowing occassional loss of prime.