Well since we were talking about keeping this spare injection line with us for our travels, along with a few other goodies mentioned in previous posts some time ago; I think it would also be a good idea to keep few injector o'rings in our tool box to. I needed one today in fact when I was stumbling around under the hood doing odds and ends when I bumped a return line/cap in such a manner that it must have disturbed the orings on that injector because it leaked like a siv next time i fired it up. I live in the middle of nowhere and thankfully I had a spare set of orings so 5 mins later I had new ones on that injector and I was fine. I would have had the valley pan filled with fuel if I had to drive into the city to get some orings
The Motorcraft part number for the orings is E6TZ-9229-AB (CM-5002). They are small, light and easy to keep in you glovebox or toolbox no problem.