My son filled up by 2001 volvo with a tank full of

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You have a crack in one of the flexible fuel lines inside of your gas tank that lets the pump suck air when ever the gal level is below the level of the crack in the line. It is an easy repair once you remove the fuel pump. Should cost you about 3 dollars if you do the work yourself. To test fill you tank all the way to the top and go turn a corner and see what happens. I bet it will run just fine with a full tank.

Electrical issue is causing your hassles. Look for a bad ground in circuit common to those items.

Did you change fuel filter.

Your sending unit in the tank is bad and needs to be replaced. There is a short in it. That is the only thing that can go wrong with it. There is probley a broken wire on it so it wont read right.

your volvo has two pumps one in the fuel tank and one under the car if your car runns good from full tank to about half it is probbely the pump in the tank that is the problem if the car tend to missfire and run poorly. good luck Hans from sweden the home of the mighty volvo

Check for clogged fuel filter or clogged fuel lines.

mine did this.lift the back seat and remove the fuel sender out the tank.youll see its full of gunk..

How much water do you think got into the tank? If the fuel door was closed it could not have been much. You need to have the tank drained to get all the water out, and then add a fuel dryer liquid to get any residual moisture out. After you son has done all of this, it should run fine and you should not have to replace the pump.

The fuel pressure regulator or the Mass Airflow sensor are common problems with the 240, and will cause these symptoms.

Bret
RepairPal.com