Remove seat fatboy

Shouldn't be too different than any other bike. Take off the seat first. Turn the fuel switch off (actually it probably has a vacuum switch so just remove the fuel line) Unbolt the base and slide the tank off. Careful of snagging any stray lines while you're at it.

That tube is the seat post. Without the proper clamp, you're screwed. Contact local bike shop for assistance

To remove a 2011 XL fuel tank FIRST purge the fuel supply line of high pressure gasoline by removing the left side cover, removing the fuel pump connector from the ECM caddy cover (2), unplugging the fuel pump connector, starting the engine and allowing it to run until it quits and then operating the starter for another 3 seconds, turning the ignition switch to OFF, releasing/disconnecting the fuel tank quick-connect fitting, removing the main fuse, removing the seat and draining the fuel tank, (If inserting a tube into the fuel tank to remove fuel do so only on the right side to avoid damage to the fuel pump assembly on the left side of the tank interior.)THEN remove the vent hose, cable clip securing the fuel pump wiring harness, unplug the unplug the fuel pump connector, remove the bolt thread protective caps, lock nuts, screws and washers from the front and rear of the fuel tank, put a clean soft cloth or towel over the front of the fuel tank protect it from damaging contact with the top fork clamp, lift the rear of the fuel tank up, remove the fuel pump harness from the clip on the frame backbone tube and remove the fuel tank from the bike to a workbench area. Where the fuel pump assembly can be removed if necessary and where the tank can be cleaned if necessary.

To install a 2011 XL fuel tank FIRST install the fuel pump into the fuel tank with a new gasket, THEN place the fuel tank onto the bike over the frame backbone tube ensuring that the front fuel tank brackets go on outboard of the ignition coil bracket, put the washer on the long bolt and insert if from the left side into the front fuel tank bracket, the ignition coil bracket, the frame and the right side fuel tank bracket, put the second washer over the bolt threaded end and start the locknut. THEN put a clean soft cloth or towel over the front of the fuel tank to protect it from damaging contact with the top fork clamp, lift up the rear end of the fuel tank and put the fuel pump wiring harness into its clip on the frame backbone tube ensuring that the harness forms a loop between the clip and the fuel pump module to keep from pinching the harness between the fuel tank and the frame backbone, route the fuel pump wiring harness down along the left side of the H-bracket, secure it with a cable clip, push the clip into its hole in the H-bracket mounting boss, lower the rear of the fuel tank into place, put the washer on the short boltandfrom the right side push it into place through the rear fuel tank bracket and frame, put the second washer over the threaded end of the bolt, and start the locknut onto the bolt threads. And then tighten both the front and rear fuel tank mounting nuts and bolts to 15-20 ft-lbs (20.4-27.1 Nm), install the protective caps over the bolt threaded ends, install the vent hose, connect the fuel tank quick connect fitting and ensure that it is locked into place, fill the tank with fuel, carefully inspect for leaks , install the main fuse, turn the ignition switch ON and verify fuel pump operation, again inspect for fuel leaks, turn the ignition switch OFF, close the side cover and install the seat.

remove the seat the removing the two large bolts on either side of the bike. The battery inside the "horseshoe" oil tank. Connect your charge in proper polarity.

To remove the seat on a 2002 Fatboy:
1. Unbuckle the ******** the seat by pushing the metal part of the strap down from the left hand side of the seat.
2. There are two bolts located underneath the seat on the sides one on the left and another on the right which you have to unscrew.
3. There is another bolt located behind the passenger seat that you have to unscrew lift the seat up and that should do it.
PS When reinstalling the seat watch out for the bolt on the passenger seat not to scratch the tail of your bike.

Im not to sure on street bikes but i know on dirt bikes you pop the seat off first and if needed the side covers too.... then u can access the fuel tank bolt to take it off the frame...

First take off the seat, turn it upside down, unscrew the two screws and two bolts that hold the two parts of the seat together. Separate the pillion and rider seat (takes a bit of wiggling), now you can concentrate on the riders seat. undo the four screw that hold all the rubber gromets down (make a note of the direction they are facing), and unbolt the two small bolts on the front. The seat should now come apart, move the bracket at the back of the seat down a hole. Re-attach the two halfs of the seat at the front but this time one hole up. You should see a gap between the two halfs. Put the rubber gromets back on, this is where I went wrong the first time, TURN THE FRONT TWO 180 degrees and leave the back ones how they are. Screw everything back together and you have one raised seat my long legged friend.