fuel tank filler strainer removal

How do you remove the metal strainer in filler opening of fuel tank

Strap wrench.

Or a belt and a crowbar.

Chain strap wrench, Vise-Grips makes one.

Is this the inverted witches hat screen filter you speak of? The fuel cap comes off with a 1/4 turn & the inverted witches hat screen comes out of the tank till it stops. At that point, you turn the screen cartridge till the dimples line up & it then completely lifts free of the fuel tank. If I am in the wrong fuel tank, just ignore this post.

My assumption was 939series trucks. They're just threads, but they are notoriously difficult to remove.

On the 939s I use a monkey wrench against the lip and the threads. They do suck though on occasion

Thanks everyone came right of with strap wrench

Just fyi that the first ones made were plain steel/iron that rust badly. 2nd generation are coated yellow zinc?
Learned that when I replaced mine. I also coated threads with anti seeze

Par normal, the OP was talking about a 5 ton truck, not a Deuce or even a genset fuel tank. Since my M-1081 threads on & off easily, I could not imagine it being hard to remove. Again, ignore the original post.

Any tips for when the strainer refuses to move? I had a 4' pipe wrench on it with enough force I was concerned about damaging the tank.

I used a big pipe wrench. Biggest one harbor freight sells with 20% coupon. Soak with pb blaster or your favorite penetrating oil.