Ty
Elio Addict
Yes it is.
A regular cap seals out dirt. When removed the nozzle goes into a clean filler neck protected by the cap.
When using a "capless" filler, the nozzle pushes a flapper that is exposed to the elements into the filler neck, along with all the crap that is on and around it. Bad idea.
Actually, not quite right. The filler neck is still protected...
The following is from: http://www.motorcraftservice.com/vdirs/retail/Easy Fuel.pdf
Preventing Contamination
A flexible rubber seal, attached to the outer fuel filler door, seals the fuel filler to help prevent dirt, snow or rain from entering the fuel filler neck (Figure 6.). If the seal becomes damaged, it must be replaced to prevent possible contamination of the fuel tank. A pictogram on the seal reminds the owner to use the funnel, if fuel is being added from a portable fuel container.
The amount of dirt is probably miniscule in most cases. I've never noticed any in my wife's Explorer and we haven't had to change fuel filters though she's pushing 40,000 miles. It is probably an issue for people who drive on a lot of dusty dirt roads or off road a bunch but neither of those scenarios seems likely in an Elio. Those 20 fill ups per 12,800 miles probably won't add much dirt to a filter. I've fueled my F350 with some horribly dirty nozzles... Diesel fuel seems to attract the dust and dirt but if it were capless, I don't think I would have introduced much more dirt.
If the pump is IN the tank and not filtered prior, I could see that as not quite ideal as the dirt would pass through the pump first. Still, I just can't see it as much of an issue. I drove a lot of dirt roads in rural Georgia growing up and never had fuel pump issues. Okay, it was a '65 Mustang with a manual fuel pump...
If you really feel like the big manufacturers haven't done some analysis on engine or pump wear and tear due to the capless system, $25 can buy you some peace of mind.
http://accessories.ford.com/locking-fuel-plug.html
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