What thread is the fuel rail where the Schrader valve connects? - ZR-1 Net Registry Forums

scorp508 · 07-26-2024

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.

A26B · 07-27-2024

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 · 07-28-2024

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/n...SABEgLECvD_BwE

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

scorp508 · 07-29-2024

Thanks guys, this is great info.

07-26-2024	#1
scorp508 Join Date: Jan 2024 Location: Boston, MA Posts: 179	What thread is the fuel rail where the Schrader valve connects? 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. Last edited by scorp508; 07-26-2024 at 10:59 AM.

07-27-2024	#2
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,393	Re: What thread is the fuel rail where the Schrader valve connects? 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. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

07-28-2024	#3
1991 Corvette ZR-1 Join Date: Sep 2018 Location: Florida Posts: 305	Re: What thread is the fuel rail where the Schrader valve connects? 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/n...SABEgLECvD_BwE Edit: it should be a 4AN fitting. A 9/16 wrench should fit the fitting that threads onto the schrader. Last edited by 1991 Corvette ZR-1; 07-28-2024 at 10:58 AM.

07-29-2024	#4
scorp508 Join Date: Jan 2024 Location: Boston, MA Posts: 179	Re: What thread is the fuel rail where the Schrader valve connects? Thanks guys, this is great info. __________________ 1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red