Whos running the stock one way check valve on the GM map sensor? I've been running with it in place. Any feed back would be greatly appreciated. Thanks..!!

 

What check valve? I don’t think it would work if there was a one way valve, it wouldn’t read vacuum, and when it pressurized, it would hold the pressure at a steady state or viceversa.

Are you referring to the “gas filter”? I am running it inline with my map sensor. I see no reason why this would be omitted.

 

The filter thats what I meant. So keep it then?