The submersable fuel line is available at Napa Part number H209. It is made by Gates. It is approx $20 a foot and comes in 1 foot pieces. Check the prices if you have more than one Napa because it varied by $10 between stores in my area. If you go on Gates website for the hose they show it being used on a caravan pump assembly. Another tip I have is buy good USA made clamps. I have had good luck with Ideal clamps, The ones that come with many pumps are cheap clamps and they tend to strip very easily.

One thing about the Walbro pump is I had the pressure relief valve go bad on mine causing the fuel pressure to drop all of a sudden. Pressure was fine at idle and would raise to 68 PSI where it would all of a sudden flutter and drop below 50. This caused a lean missfire / backfire. I verified this by putting the pump in a bucket of water.