What thread is the fuel rail where the Schrader valve connects?

[scorp508]

I'd like to move my Scrader valve a bit by turning it up 90* to retain the ability to relieve pressure and take a mechanical reading, as well as have a second port for a permanent electric fuel pressure sensor. The stock location is pretty tight against the IAC motor. Anyone know the thread pitch off-hand at the end of the fuel rail? I've seen -4AN and -6AN mentioned. Thank you. :cheers:

[A26B]

I don't think the schrader valve is removeable from the rail, it is permenantly affixed to the end of the rail. I have seen valves tig welded in the end for special purposes, such as you are planning.

[1991 Corvette ZR-1]

Nitrous Outlet has a schrader adapter block available which would allow you to use the existing shader to thread onto. From there, you can install a new schrader valve, as well as a sensor for fuel psi monitoring. Originally developed for LT1 and LT4 engines I believe, but it can work on LT5s as well.You will need a core removal tool to remove valve inside the shader.



https://nitrousoutlet.com/products/nitrous-outlet-gm-pontiac-lsx-shrader-valve-fuel-adapter-kit-1997-2013-corvette-2004-2006-gto-2006-2007-cts-v?gad_source=1&gbraid=0AAAAADPns4RVlErDM_pXRjIZSN_-ulf8m&gclid=EAIaIQobChMIlNTX0O_JhwMVmDQIBR0viAmTEAQYASAB EgLECvD_BwE


Edit: it should be a 4AN fitting. A 9/16 wrench should fit the fitting that threads onto the schrader.

[scorp508]

Thanks guys, this is great info. :cheers: