Fuel gauge goes to full after driving?

[mgrooms]

Sometimes while driving (time not a factor) the fuel gauge will rise to full. After the car is off and sitting sometimes the gauge will go back to correct fuel measurement and sometimes still read full.

I recently installed the Walbro 190 due to a bad stock pump. The car is also having issues starting. It is cold, so I went ahead and swapped out the coolant temperature sensor since I read that could be the cause for tough start.

The next step is to check the fuel pump o ring. If the o ring is cracked, could this cause the fuel gauge to rise to full? Is there something else I need to check?

 

[white92talontsi]

Usually what will cause the needle to go full like that is when the wire to the sending unit is grounded.

Pull the pump back out and check the wire for chaffing and make sure that it is not touching any metal.

 

[Hult250R]

If you replaced the pump the fuel may be bleeding back out of the lines back into the tank after it shuts off. Make sure you put the o-ring and the white clip on the top of the fuel pump to seal it into the metal fitting on the fuel pump hanger.
If you bump the key to prime the fuel pump a couple times before you crank it over to start does it start any easier? If so this may be your problem.

 

[pauleyman]

If you replaced the pump the fuel may be bleeding back out of the lines back into the tank after it shuts off. Make sure you put the o-ring and the white clip on the top of the fuel pump to seal it into the metal fitting on the fuel pump hanger.
If you bump the key to prime the fuel pump a couple times before you crank it over to start does it start any easier? If so this may be your problem.

None of this has anything to do with the fuel gauge. Fuel pump and fuel sender are two separate circuits. I would agree there is a wire or connection shorting out on the fuel sending unit likely right at the sending unit/fuel pump housing. The float sender is for the needle gauge.

 

[mgrooms]

it seemed to start a little better when i allowed the fuel pump to pressure up. today it done an odd thing after it had set for an hour in the cold. I turned the key and I could hear the fuel pump on and humming but the starter/engine wasn't cranking. Usually, the engine cranks until it starts. I let it sit for 30 mins and tried again and it started right up. I finally have it to the garage and I plan on working on it in the morning. Would this be the starter giving me issues now?