I've seen this posted befor but i couldn't find the answer so here it goes. I have a 2000 mazda protege ES. Just recently when I go to put gas in it I can only put a little at a time because it starts to overfill. What it does is allows me to put about a half a gallon and then it overfills. Then I wait about 20 sec and start the whole thing over again. It is very much a pain in the ***. It takes me about 10 min to put $10 in my tank and thats at $3.50 a gallon!! Any help would be great.

 

Go to this link
http://protege5.ugly.net/#ac

Look at section 1-14, page 14. I think you may have a blocked no return valve.