While mine isn't quite that bad, I've been thinking it's time to do the same thing. I think someone previously said you can get the part from St. Charles Isuzu for about $35. Apparently mine has been screwy for a long time. It reads 1/4 tank when it still has half a tank left (or more). It could be worse though - it could be reading too high. :-) I wonder if it has anything to do with the fact that I always fill it up when it gets to 1/4 tank? I heard letting it get too low on a consistent basis can be bad for the fuel system so I just developed a habit of refilling then.

Anyway, I haven't gotten under there and really looked at it yet, but my VX maintenance CD makes it look like a pretty simple and straightforward replacement (unplug a pin connector, a few screws). Here are the screenshots:













Hope that helps!