stupid fuel gauge

[lowrodderchev]

hey guys ive researched trouble searching on fuel gauges but this ones got me twisted. 6 months ago I put a new sending unit in my blazer. so I could see how much gas I had well recently it started to mark 1/2 no matter what was in the tank. and every so often it would mark correctly and then go back. well the last 5 days its just stayed on 1/2 tank. i know i have at least 3/4 tank. i switched the fuel gauge and same thing. any ideas? i bought the sending unit at oreillys they aint to fun to put i either LOLthanx