Ford Repair: 2005 V6 Mustang, vent valve, gas in my car

Question
I have two problems. First, sometimes when I go to put gas in my car it will stop as if it were full and sometimes it will actually spit the gas out. My second problem is all of my gauges except for the speedometer have stopped working. Also Sometimes the speedometer is inaccurate for example it will show that I'm going 20 mph when I'm really going around 45 mph. The gauges went out one by one.

Thanks for reading.

Answer
sorry to take so long to get back to you- i need to ask, did these problems start to happen at the same time ??? reason is, the fueling problem sounds like the canister vent valve is staying closed and your speedo concern could be related as the result of a bad ground circuit