I am using an R18A out of a 2014 Civic for an off road rig and I see this black plastic fitting with a hole in it under the fuel rail. But I do not see it in any diagrams or on most other civic fuel rails.

Can someone tell me what this is and if the hole serves some sort of purpose?

Thank you.

 

it's the quick connect fitting, how do you think the fuel is going to get to the connectors lol

 

Looks like a fuel pressure damper. Helps regulate the fuel pump pressure. I remember taking one off my 94 civic and it would make the injectors click louder. I dont think the bottom hole is connected to anything.

 

Yes, the device that the OP is describing is the fuel rail pressure dampener. The black "top hat" is actually a cover snapped on to the dampener. There is a small phillips screw in the middle of the dampener for fine tuning... and the black cover keeps the screw from getting lost if it loosens over time. Nothing to worry about... just run it.

 

Holmes. Please take some time to read the helpful and accurate posts below....

Yes, thank you see below.

Jr Thank you. That is exactly what I needed to know. It is curious why some have this and some do not. Oh well, at least I know...

CR

 

or you could just circle exactly what it is you're asking about