Problems with  injectors immediately after installation are almost always due to improper installation which can ruin the o-rings

Because of the position of the fuel injectors in relation to the fuel rail, extreme care should be taken during installation so as not to damage the o-ring seals. .
Always inspect the orings for damage before considering the injector itself to be defective.
Just prior to installation we recommend the use of Palmolive soap to lubricate the o-rings. Petroleum based products have chemicals that get absorbed in the o rings after a long period of time. The soap leaves no residue..
Use a rocking motion to install the oring in to the fuel rail and instake manifold. Never twist-in or "screw-in" the injector.
This may cause scoring or cutting of the oring.
We also recommend that the fuel lines and fuel rails be flushed prior to putting in new injectors. The contaminants in the lines can collect in the tiny filter inside the injector. This can cause problems down the road. Prior to installation inspect any inline fuel filter that may be dirty and cause contamination of the new parts.
If your vehicle has been stored or sat unstarted for more than several months there are many other safeguards you should take into account
before replacing fuel injectors and starting the engine. Consulting our tech dept. with any questions is advised.

if you have any questions on installation please e-mail