2005 Buick Rainier Q&A

2005 Buick Rainier Question: Why would fuel gauge go up and down.

The fuel gauge go's up and down at any giving time but fuel pump is working fine. -
Answer 1
TEST GAUGE AND FUEL TANK SENDING UNIT.MOST LIKELY SENDEDR IN TANK -
Comment 1
Thanks is this easy to test and can we do this at home? -
Comment 2
IF YOU CAN DROP THE FUEL TANK OR HAVE A SCANNER -
Comment 3
Oh. No scanner.. thanks do you know about how much that cost.and one more? Do you know what would make the low beams go out for no apparent reason? High beams and fog fine. -