How much pressure does it take to press new fuel injectors with new o-rings into the fuel rail, not the intake. When i installed mine i sprayed a little WD-40 into the fuel rail to make things a little slick and the fuel injectors literally effortlessly poped into place on the rail. Does this seem right or should it take a lot more force? Could my o-rings be undersize? When i pick up the fuel rail with all 8 injectors and hold it up in the air all the injectors stay put and none of them fall out so they seem to be seated. Im just worried about leaks.