where can i buy the shutter valve, thats not the dealer? how can i know if my problem is the shutter valve, the sending unit(s) or the filler hose? im filling it uo with about 12 gallons and after that it just spills out and sometimes it doesnt read full

 

Unless you're a mechanic, Id go to the dealer when it comes to this type of problem. In your other post, members have suggested the TSB for the fuel line recall. Not knowing exactly what you need, you can try to searching in this diagram and order the parts from this link.

 

I've had the same problem for almost 2 years. My tank only fills up 3/4 and spills if I try to put in more. Also, the needle seems to float or waver a little bit on the gauge. Have been too cheap to bring it in to the dealer yet.

 

what should i change,, the sending units or the filler hose?

 

How many times are you going to post this question? It's impossible to answer without tearing apart your fuel tank. Take the car to the dealer already!!!!