2009 xf 4.2l non super charged. Just wondering what size the fuel hose is that goes in between the rails is? I had to cut mine to get a feul pressure gauge on her for testing as I couldn't manage to seperate the hose itself from rail.

 

If/when you find the hose size and type, please post the results,

 

between the rails is 5/16 fittings are barbed, the oem hose had a type.of plastic inside it, i was.unable to find one of simalier make so went with high pressure efi hose. Now for some reason thow it was tight fit but when i started it up i spraying out of the bank2 side, to stop this i had to use hose clamps, but seems to be holding up for now.