gas hand on 1999 GMC Yukon

when im driving my gas hand say my truck is on full but when i hit the brakes it goes down wat should i do?

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
I see a fuel level sensor kit available from AC Delco but there are three different options probably should have a tech diagnose this.