Gas needle does not go to full when you fill up

Sounds like a bad float or weak gauge.you can always use the miles trip to predict how much fuel you have left in cases like these the trip can be your best friend.have someone experienced change the float in the tank then if not float change gauge but like i said someone that knows what they are doing if not they can mess the entire dash up and short alot more than you would think out so try float or gauge if it has over 150k miles its probably the float.

Try un hooking battery.

If your fuel gauge is showing you in accurate readings this is normal to all vehicles that are not used to fill-up gas full regularly but sometimes the cause of the inacuracy is due to faulty float valve in the gas tank you need to replace it

probably not all that difficult to fix it you have patience. The needle going way past full is an indication of a short before the sender unit or in the sender unit. Pull the power wire from the sender unit and see what the gauge does. IT should stay on the empty mark. IT may be just a fuel sender unit .

need to replace the sending unit in the fuel tank

it sounds like the level sensor on the sender (fuel pick up pipe in the fuel tank) is getting stuck. the level sensor is a float that is attached to the sender, and you will need to remove the fuel tank to get to it.

hope this helps.

If you remove the sending unit in the gas tank, move it manually by hand as u saw done earlier, the gauge on the dash should also move. As long as the sending unit in the tank isn't 'stuck' at the half full level, the gauge should register empty to full as it moves. To be honest, I'm not sure if I would bother taking the sending unit out. 1st, u must be very careful not to blow yourself up when working on the gas tank (no sparks, etc), all u really need to do is fill up your car, see how many miles a tank of gas will go (carry a can of gas with u to see how many miles before u run out). If it's 350 miles, just set the trip gauge to zero every time u fill up, and get gas every 300 miles so u don't run out. If the sending unit moves freely, everything (wiring ) is connected properly, then it probably is the fuel gauge. good luck!

Yes it is all one unit, and yes that is what the problem is. don't use aftermarket parts, use OEM, (Delco Remy) they are much better quality.

it is the pontimeter in the fuel sender you can buy it seperate from the whole assembly and they had alot of problems with them please rate -jeff

i can usually fix these for very cheap $...call 508 822 4490