So I've had my new 2011 2500 HD for about 3 weeks and have usually kept it topped up with fuel. when it gets to half I fill it up. No issues until today I was at 1/4 tanks put in 80 liters and when i started the truck the gauge barely moved. turned key off, restarted and it went to 1/2 then slowly climbed to 7/8. I did not let the nozzle click off just put in $100. and stopped. Any ideas?