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

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.

Re: Fuel pressure test port cap
 

Good information, thanks for your help!

Bill

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!!

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.

Re: Fuel pressure test port cap
 

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.

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

Re: Fuel pressure test port cap
 

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

Thanks for sharing.

Re: Fuel pressure test port cap
 

Theres another thread about this exact topic.

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.