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Quite a while ago I replaced the pick-up hose with 1/4 tygon. Last month I replaced the fuel filter to injection pump line with diesel rated 5/16 and it fit perfectly. Not sure what lies between the two.

Edit.
Sorry, now I see you are asking specifically about the injector return lines. Haven't had occasion to mess with those but on my various trucks they are surprisingly small.
 
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Took a look after my mow today. The tubing between the two injectors is not marked, but there is regular fuel hose on the last and it is stamped 3/16.
 
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