Have 1990 johnson tracker 40 hps TJ40elesr.The Clymer book says that pulse limiter fittings v4 and 60* v6 models are screwed into the crankcase and all other models are connected inline.Well I can find my inline but it looks like my is screwed in crankcase is that possible? It also say's that this pulse limiter is equipped with an integral check valve so I take it you can only blow one way on this fitting? am I right 