Here is a small (but very very usefull ;D) guide how to survive a tank attack. Never Never Never stand and wait till it arrives, you get a great chance to get kicked by your teammates if you do stupid things. Read this and your teammates start respecting you with your smart tricks!

This guide is explained in 3 easy steps and some other thing you should know.

If you hear the tank, you may not know what to do. so here is step 1.
Never Never Never stand in a narrow hallway. Search for an open place where you have a perfect sight to shoot you target!

NOT LIKE THIS

Search for fire!
you could use a molotov or gascan, but whatever you have, you need to set the tank into fire!
why? (explained in Step 3)

Now the tank is set into fire, you are going to MOVE YOUR ASS AS FAR YOU CAN from the tank!
he will slowly burn and die to the dead without wasting any ammo! How easy could it be!

(But still stand with you teammates, or a SI (special Infected) will grab you while you are running away. You will be helpless, if your teammates read this guide, they won't get back for you if the tank is there :D)

Never stand near dumpsters, cars, or some fallen trees when the tank arrives.
The most of you guys may already know this, but those "tanks" could smash it and you will be gone in a second :O

Like This

Rocks
Also, they could harm you at a distance, they can throw rocks! yes... rocks... Don't be afraid of the online players that throw rocks, you have to be afraid of the tank bots that throw rocks! They can aim like hackers and almost everytime you get hit if they throw a rock at you. There is a way to destroy those "rocks". Find a Mounted Machine Gun or a minigun (most usefull) and shoot at the rocks! The rock will break in 10000 litle pieces and you are safe!
(until he throws the next rock)

As I said, always set the tank into fire. But then?
If you dont want to run away, get the right weapon to kill it.
Check this picture out and I shoulden't tell anything more :)
(Picture not made by me)

Weapons to use on tank

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From "Ryan"
Wait for the tank, then throw some puke at him, so the other zombies in the area will get him! If one of your freinds have a molotov, make him or her throw it. Both Zombies, and Tank (Which is almost dead from all the normal zombies) Dies! =)
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From "✪Likeok4✪[Sexcellent]®♔"
TIP: if you don't have any molotovs/gascans in expert and only have bile jars don't use them as they will bring a horde and when the effect runs out they'll get you.
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From "PaholaisenHillo"
Here's a pro tip for noobs: Don't you ♥♥♥♥♥♥♥ dare to throw that pipebomb at the tank!
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From "Bro Cake"
just wait for the tank to do that taunting thing after he punches someone or throws a rock, then go point blank to him and release ur whole auto shotgun clip. He shud be pretty much dead just from this. go try :D