Hello everyone. I bought a 1995 Z28 that has not run for 8 years. I have spent the last 3 weekends working on fuel related issues. I finally started the car yesterday and it ran. But ran very rough. As to be expected after so long sitting.

My question is does anyone know what size o-ring to use in the fuel pressure regulator line? I bought an assortment of fuel safe o-rings from autozone but they all still leak. I have looked here and searched online but I cannot find the correct size listed anywhere. Any help would be great. I cannot wait to get this car running and drive it.

Thank you.

 

Well, the two pipes are 3/8 and 5/16, if that helps.

 

Thank you for replying. I have been looking at your shbox website for the past 3 weeks. It has been very helpful. I was able to find the pipe size. And I have several o-rings that look like they should create a good seal. But it still leaks. I was wondering if anyone knew the outside diameter or thickness of the o-ring I should use. Or could there be another reason it is leaking? The line doesn't feel bent or anything and I'm replacing the clip just like it came off. Any other suggestions? Thank you in advance.

 

Have you just tried getting a service kit for the fuel rail? It should have the right size in it.

GM kit PART # 17113086 (AC-Delco SEAL KIT,F/RAIL (O RING) Part Number: 217-449) includes the o-rings for the regulator.