Thanks dwp for the informative links. I understand the possibility of damaging ORVR now.

Yes, you're correct that ORVR is designed for taking up vapor not liquid, yes submerging it in liquid is not its intended usage, and yes that may result in abnormal behaviours... but car not starting? "When your car is hard to start in few months" seems like an exaggeration.

<uninformed guess>
There are two things that can break:
1. ORVR which collects the vapor and
2. engine which receives the vapor.

If ORVR breaks, it stops collecting vapor and the vapor escapes through the gas nozzle. Yes, it's bad for the environment and our health but not for the engine because engine is not involved in this at all.

Also, I'm guessing that the vapor from ORVR "floats" to the engine, not "injected" to the engine. Hence, a broken ORVR won't allow liquid fuel to pass through. And even if it does, it's just feeding fuel to engine which is very normal. No damage done.
</uninformed guess>

I admit that I have no idea how ORVR actually works. If you have any diagrams or technical documents on how ORVR is implemented on Fit, I'd really love to see that(maybe I'll stop doing this then). But at the moment, it seems like "overfill and kill your engine" is just a FUD in trying to minimize the spill.

Yes, minimizing spill is important.
No, scaring people with FUD is not right.

 

Where in my post do you see a single word about the amount of fuel I put in my car?

And please please do avoid that "over" word until this is all sorted out, thankyouverymuch.

 

Okay, so I became really interested in this system, and ended up with this: http://www.autoshop101.com/forms/Hybrid13.pdf

It's a technical document for Toyota Prius that describes:
1. its implementation of ORVR on page 11.
2. methods for diagnosing parts that may be damaged by topping off on page 15~18

Seeing that some parts indeed may be damaged due to topping off, along with the fact that motor companies have ways to detect our toppoing off behaviour, convinced me that I should stop doing this.

I've been toppoing off every vehicle every time all my life. Bummer.

 

And it was an exaggerated FUD indeed.

According to the document above,
In normal cases, if it breaks, gas pump clicks too early in putting in the gas.
"In extreme cases", the fuel may surge back. This is a tech document; "extreme cases" means never.

Also notice that neither are related to car starting.

Yes, topping off might damage some parts in your car that'll annoy you alot and cost lots of money for repair.
Yes, I'm gonna stop doing it.
No, scaring people with FUD isn't right.