Fuel Pressure\Vac Test Port

[TowingMaster]

Does anyone know what size the schrader valve test port is for testing fuel vac\pressure? Or better yet where I can get just the valve adapter? GM lists the tool part number for the adapter as EN47620, but I have not been able to find any info on this. Thanks for your time.

[DmaxMaverick]

Welcome to the Forums!

I'm not sure about the size, short of measuring it. If you are looking to use it for monitoring with a gage, www.kennedydiesel.com (http://www.kennedydiesel.com) has a very nice gage setup designed specifically for this. TDP did a very detailed review of the gage, find it HERE (http://www.thedieselpage.com/reviews/jkfuelpressure.htm).