Recently my vette sprang a coolant leak near the front of the intake manifold on the passenger side of the engine. During the disassembly of the TPI system, I decided that I wanted to replace all of the rubber O-rings.
An email to Chris May at Superior Chevrolet yielded the following part numbers:
17113544 - Injector Seals
17111696 - O-Ring Kit
22514722 - Fuel Inlet O-Ring
22516256 - Fuel Inlet O-Ring
The above part numbers provided me with all of the seals shown below circled in red. I would recommend that you replace these seals whenever you service your TPI system. Remember, you've got gasoline under about 45 pounds of pressure flowing through the fuel rails etc. A leak could easily catch fire and cost you your car.
