It is very important to use new O-rings and grommets when installing injectors to prevent leakage of fuel and potential air leaks into the manifold. O-rings should be lubricated with gasoline during installation and injectors should be checked for smooth rotation once installed to ensure proper seating.
Finally, many applications use a bidirectional spray pattern which requires precise positioning of the injector in relation to the cylinder head. Use care to follow proper procedures outlined in the appropriate repair manual.
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