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Blue tips On Injectors

Are the blue tips on the D-Jet injectors needed to make a good spray pattern? How much rust on the top and under the blue plastic cap with the electric connection is OK before the risk of a fuel leak is too great?
Marcus Weiner

David says: I don't recall testing or spraying any without the tips. I think they get replaced by the people that flow test, clean and recondition injectors. I'm not 100% sure of this.

I've never seen or heard of injectors leaking fuel out through the body. I guess it's the amount of rust required to weaken the metal so it won't hold 30+ psi.

Another great fuel leak risk is old rubber hoses.

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