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Small question but does anyone know what this is? I accidentally hit it and don’t know if i twisted it or not, don’t know how important it is.
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I believe that is a rail fuel pressure tap/test point. If it's not leaking and runs fine, don't worry about.
 

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Yep, its where you'd hook up a pressure gauge.
 

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So should it be like screwed on tight or something? Im guessing it wont affect pressure just by that little cap. thanks!
The cap is a dust cover just like the caps on your tire-valve-stems. Don't go cranking on it.
 
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