Fuel pressure test port cap - ZR-1 Net Registry Forums

9T1 Red ZR1 · 12-28-2017

Hello,
Does anyone have the part number for just the cap that goes on the fuel rail where you test fuel pressure?

Thanks,
Bill

RussMcB · 12-28-2017

FYI - I think an -4AN cap will screw on there.

Mine dropped down into the valley a couple of years ago. I think I had a blue anodized cap on there for a while, and later put a fuel pressure sensor there.

9T1 Red ZR1 · 12-28-2017

Good information, thanks for your help!

Bill

Paul Workman · 12-28-2017

When I went through that search a few months ago, until a kind soul gave me one, several suggested going to a local HVAC shop - it being an AN fitting.

Good hunting!!

WVZR-1 · 12-29-2017

If you're near an ACD jobber or GM dealer you might try 214-1044 or 25532662. I've never tried this but I don't know why not. With whatever you buy be sure to check inside the cap for the o-ring seal. I think that generic -4AN caps may not have the seal.

If you try the GM I'd be interested if you post back and mention your thoughts. I've always intended to but haven't had the need so I never have.

RussMcB · 12-29-2017

Quote:

Originally Posted by WVZR-1

If you're near an ACD jobber or GM dealer you might try 214-1044 or 25532662. I've never tried this but I don't know why not. With whatever you buy be sure to check inside the cap for the o-ring seal. I think that generic -4AN caps may not have the seal.

Feel free to correct me if I'm wrong, but that seal probably isn't super important. The cap is mainly to keep out water/dust, right? It's not holding fuel pressure in the rail. My hunch is, the AN cap wouldn't let anything in as long as it's on tight enough not to back off due to vibration.

9T1 Red ZR1 · 12-29-2017

Thanks again for the information. I ended up at Lowes and bought part number 40-4X P. For $2.00, I have a cap that will work although it isn't NCRS!

Thanks again,
Bill

RussMcB · 12-29-2017

Ah, 7/16-20 straight thread, 4AN.

Thanks for sharing.

Hog · 12-30-2017

Theres another thread about this exact topic.

Marc Haibeck · 01-01-2018

GM did not issue a part number for the metal silver cap used on the LT5. The cap was available in a service kit that included a new valve. The kit is PN 17112219 discontinued by GM.

12-28-2017	#1
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Fuel pressure test port cap Hello, Does anyone have the part number for just the cap that goes on the fuel rail where you test fuel pressure? Thanks, Bill __________________ LT5 Red/Red

12-28-2017	#2
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,160	Re: Fuel pressure test port cap FYI - I think an -4AN cap will screw on there. Mine dropped down into the valley a couple of years ago. I think I had a blue anodized cap on there for a while, and later put a fuel pressure sensor there. Last edited by RussMcB; 12-29-2017 at 10:26 PM.

12-28-2017	#3
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Re: Fuel pressure test port cap Good information, thanks for your help! Bill __________________ LT5 Red/Red

12-28-2017	#4
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Fuel pressure test port cap When I went through that search a few months ago, until a kind soul gave me one, several suggested going to a local HVAC shop - it being an AN fitting. Good hunting!! __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry

12-29-2017	#5
WVZR-1 Join Date: Oct 2004 Posts: 1,889	Re: Fuel pressure test port cap If you're near an ACD jobber or GM dealer you might try 214-1044 or 25532662. I've never tried this but I don't know why not. With whatever you buy be sure to check inside the cap for the o-ring seal. I think that generic -4AN caps may not have the seal. If you try the GM I'd be interested if you post back and mention your thoughts. I've always intended to but haven't had the need so I never have.

12-29-2017	#7
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Re: Fuel pressure test port cap Thanks again for the information. I ended up at Lowes and bought part number 40-4X P. For $2.00, I have a cap that will work although it isn't NCRS! Thanks again, Bill __________________ LT5 Red/Red

12-29-2017	#8
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,160	Re: Fuel pressure test port cap Ah, 7/16-20 straight thread, 4AN. Thanks for sharing.

12-30-2017	#9
Hog Join Date: Jul 2010 Location: Woodstock, Ontario, Canada Posts: 1,275	Re: Fuel pressure test port cap Theres another thread about this exact topic. __________________ peace Paul ZR-1 Net Registry Member #1494

01-01-2018	#10
Marc Haibeck Join Date: May 2007 Location: Addison IL Posts: 239	Re: Fuel pressure test port cap GM did not issue a part number for the metal silver cap used on the LT5. The cap was available in a service kit that included a new valve. The kit is PN 17112219 discontinued by GM.