Nothing goes in unless you screw something onto the port.
It's not to look pretty.
Sure, there is a slight chance that if the valve leaked so a fire thing.
Toby,
Thank you for agreeing with me while telling me I'm wrong. You can run without cap all you want but in some states with annual vehicle inspections such as the commonwealth of Virginia not having that cap would fail your vehicle.
19VAC30-70-320. Fuel system. Inspect for and reject if: 1. Any part of the fuel system is not securely fastened.
So go without screwing something in your port and go with a slight chance of fire or buy a 50 cent cap.
I think the answer is clear here.
I'm going to eat a apple do you want a orange?[/QUOTE]
You can get bent out of shape for me disagreeing with you...or "saying you were wrong" all you want. No harm there.
Just explaining that you comment about keeping potential debris out of injectors is not what it does.
It doesn't have anything to do with injectors or what gets to them.
I doubt they look for the cap in annual inspections because that is not a "fastened" item but VA is pretty picky and has garages do the inspections which is conflict of interest in itself so they might. Or at least some shops might pay attention. Now a fuel rail with bolts missing..that is not properly fastened and could lift up and injector could spray.
You would be hard pressed to find a typical mechanic (even at a dealer) who would bother to point out the port cap was missing or worry one second about it.
That's just how it plays out in day to day shops and repair people, professional or DIY.
For the other poster's comment about why it's there. Sure, but most cars will go their entire life an NEVER have anything screwed onto the port or the cap even taken off. Nothing there going to damage the valve.
Even tires run around all the time with no cap and does that cause a problem?? NOPE
Just lets the threads oxidize more.
Next you'll tell me it's important to have the plastic valve stem caps on you tires too.
Let's just say it makes some people feel better...much better apparently, but in daily life...if make little difference.
Do they check those at inspections too? They might. Some states are out of control ridiculous.
Just because a certain state or dealer or manufacturer says or recommends something doesn't really make it true.
I'm just saying for certain that you will have a fuel leak form a line connection before you will have an issue with the port valve form not having a cap on it.