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Yes absolutely needed. You need the full seal kit including the pintle cap, two o-rings and the spacer. The o-ring is how the injector seals to the intake manifold and the pintle cap holds the o-ring seal and spacer on the injector. There is a 2nd o-ring at the top of the injector to seal where it goes to the fuel rail. Buy the seal kits from pelican. Normally sold separately from the injector.
Don't even attempt to start it without these seals or you could have fuel everywhere. Also if you are doing the work yourself, do it outdoors, have a fire extinguisher handy and pressure test before starting by using a DME jumper.
Be very careful...
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