Alternative Port EFI IntakesThis board is for tech discussions and questions about aftermarket port EFI such as the HSR, MR, SR, BBK, FIRST, etc.
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I thought I read on here where the TPI schrader valve is like a -4AN fitting and could not work with standard pressure gauges. Ive got my schrader valve out of my HSR fuel rails, and it appears to be NPT. Can anyone verify the threading on the HSR fuel rails? I went ahead and ordered a piece from summit, part# fbm2001 because I read somewhere on here that may be needed. Only 2 bux, no biggy, but I Cannot find the post where I originally saw it. And my dumbass also reaslised that the piece I ordered it is a flow through adapter, and not a "replacement" schrader valve.
Unless you already own some sort of TPI-specific (-4AN) fuel pressure gauge, there is no need for that adapter. You are correct that the HSR schrader valve is 1/8" NPT.
