As with any type of seal on the fuel system you must replace copper or aluminum washers any time you disturb one. Pull a banjo then replace the two washers (one on each side). Injector o-rings are very inexpensive, unless they've already been replaced less than a year ago you should replace them if you pull the fuel rail.
Even if these parts were expensive, I think most people would agree that the price is far less than that of a horrible fiery death.... Or worse, you lose your car and survive the incident crippled.
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