Thanks for the ideas! I got back with no issues at all, not a drop of diesel out.
Before the trip I cut off a mini-section of the above mentioned hoses, the `standard heater hose` (currently being used) + the thick wall heavy duty heater hose + the pneumatic hose as well and soaked them separately in #2 Diesel just to see if anything happens... but so far (in about 5 days) there`s no breaking down or discolored fuel visible in the jars.
I think I do have some help for the IP; having the fuel system pressurized by a leftover pump from the 4cyl setup, but I`m not quite sure yet. (Probably the `Red wagon build` thread mentions it?)
After disconnecting the hoses I left both ends open so I basically let it lose a few liters of fuel but later had no issues of air entering; I turned bleeder screw on filter, also kept idling for a while.
I also found a nice informative website to buy any type of hoses. I love it because you don`t have to get a minimum of 25, 50, 100 feet.
http://www.mcmaster.com/#standard-pl...tubing/=og78g6