Tank contents are lost on chunk load about pressure HOT 4 CLOSED

Please post your forge log, if there's something going wrong with saving/loading it will probably be there.

from pressure.

The only obviously relevent bit I found in the logs was this:
[01:02:46] [Client thread/INFO]: net.bdew.pressure.blocks.tank.gui.GuiTank
[01:02:46] [Client thread/INFO]: net.bdew.pressure.blocks.tank.gui.ContainerTank

If that's not helpful, here's a somewhat larger sample of the log file - this spans from about the time I begin setting up the bug to logging in again and verifying that the tank has been emptied.
[01:02:34] [Netty Client IO #0/INFO]: Server protocol version 1
[01:02:34] [Netty IO #1/INFO]: Client protocol version 1
[01:02:34] [Server thread/INFO]: Changing view distance to 12, from 10
[01:02:34] [Netty IO #1/INFO]: Client attempting to join with 72 mods : [email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],TubesCore@${version},[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],NEIAddons|[email protected],[email protected],NEIAddons|[email protected],[email protected],NEIAddons|[email protected],[email protected],[email protected],@000,[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],bagginses@@MODVERSION@,MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],NEIAddons|[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],inpure|[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
[01:02:34] [Netty IO #1/INFO]: Attempting connection with missing mods [] at CLIENT
[01:02:34] [Netty Client IO #0/INFO]: Attempting connection with missing mods [] at SERVER
[01:02:34] [Server thread/INFO]: [Server thread] Server side modded connection established
[01:02:34] [Client thread/INFO]: [Client thread] Client side modded connection established
[01:02:34] [Server thread/INFO]: Redacted[local:E:c313043b] logged in with entity id 232 at (572.7508156027036, 73.0, 201.87256266522414)
[01:02:34] [Server thread/INFO]: Redacted joined the game
[01:02:34] [Client thread/INFO]: 11 / 11 applied
[01:02:34] [Server thread/INFO]: SERVER: MineMenu is installed. Sending server response packet
[01:02:35] [Client thread/INFO]: Receiving Server Configuration...
[01:02:35] [Client thread/INFO]: Received server configuration
[01:02:35] [Server thread/INFO]: World changed, resetting
[01:02:35] [Client thread/ERROR]: Failed to find identifier for: thermalfoundation.item.ItemLexicon@4a6ef960
[01:02:35] [Client thread/ERROR]: Failed to find identifier for: thermalexpansion.item.tool.ItemWrench@9c0f4be
[01:02:35] [Client thread/ERROR]: Failed to find identifier for: thermalexpansion.item.tool.ItemIgniter@586048eb
[01:02:35] [Client thread/ERROR]: Failed to find identifier for: thermalexpansion.item.ItemFlorb@2cda5432
[01:02:37] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2478ms behind, skipping 49 tick(s)
[01:02:37] [Client thread/INFO]: [INpureCore]: Get off my curb you good for nothin! (Hiding tile.mobSpawner)
[01:02:37] [Client thread/INFO]: [INpureCore]: Get off my curb you good for nothin! (Hiding tile.water)
[01:02:37] [Client thread/INFO]: [INpureCore]: Get off my curb you good for nothin! (Hiding tile.lava)
[01:02:37] [Client thread/INFO]: [INpureCore]: Get off my curb you good for nothin! (Hiding tile.portal)
[01:02:37] [Client thread/INFO]: [INpureCore]: Get off my curb you good for nothin! (Hiding tile.null)
[01:02:37] [Client thread/INFO]: [INpureCore]: Get off my curb you good for nothin! (Hiding tile.fire)
[01:02:37] [Client thread/INFO]: [INpureCore]: Sweeping ForgeMicroblocks under the nearest rug...
[01:02:37] [Client thread/INFO]: [INpureCore]: Burying ExtraUtilities microblocks in the back yard...
[01:02:38] [Client thread/INFO]: Added NEI integration
[01:02:38] [Client thread/INFO]: World changed, resetting
[01:02:38] [Client thread/INFO]: Available server commands:
[01:02:38] [Client thread/INFO]: Mw.load: loading...
[01:02:38] [Client thread/INFO]: generating block colours
[01:02:38] [Client thread/INFO]: loading block colour overrides file /redacted/minecraft/config/MapWriterBlockColourOverrides.txt
[01:02:38] [Client thread/INFO]: generating block map colours from textures
[01:02:38] [Client thread/INFO]: created new MwTexture from GL texture id 19 (1024x1024) (1048576 pixels)
[01:02:38] [Client thread/INFO]: processed 944 block textures, 4280 skipped, 63 exceptions
[01:02:38] [Client thread/INFO]: loading block colour overrides file /redacted/minecraft/config/MapWriterBlockColourOverrides.txt
[01:02:38] [Client thread/INFO]: saving block colours to '/redacted/minecraft/config/MapWriterBlockColours.txt'
[01:02:39] [Client thread/INFO]: [CHAT] InvTweaks: Configuration loaded.
[01:02:41] [AromaBackup/INFO]: [§1AromaBackup§r] Starting Backup. Server may lag for a bit!
[01:02:41] [Client thread/INFO]: [CHAT] [§1AromaBackup§r] Starting Backup. Server may lag for a bit!
[01:02:44] [AromaBackup/INFO]: [§1AromaBackup§r] Server Backup Done!
[01:02:44] [AromaBackup/INFO]: [§1AromaBackup§r] Next scheduled backup in 30 minutes.
[01:02:44] [Client thread/INFO]: [CHAT] [§1AromaBackup§r] Server Backup Done!
[01:02:44] [Client thread/INFO]: [CHAT] [§1AromaBackup§r] Next scheduled backup in 30 minutes.
[01:02:46] [Client thread/INFO]: net.bdew.pressure.blocks.tank.gui.GuiTank
[01:02:46] [Client thread/INFO]: net.bdew.pressure.blocks.tank.gui.ContainerTank
[01:02:52] [Client thread/INFO]: net.minecraft.client.gui.GuiIngameMenu
[01:02:52] [Server thread/INFO]: Saving and pausing game...
[01:02:52] [Server thread/INFO]: Saving chunks for level 'Test'/Overworld
[01:02:52] [Server thread/INFO]: Saving chunks for level 'Test'/Nether
[01:02:52] [Server thread/INFO]: Saving chunks for level 'Test'/The End
[01:02:52] [Server thread/INFO]: Saving chunks for level 'Test'/Underdark
[01:02:59] [Netty Client IO #0/INFO]: CLIENT: Disconnected from server, enabling all click actions
[01:02:59] [Netty Client IO #0/INFO]: Updating configuration files
[01:02:59] [Server thread/INFO]: Stopping server
[01:02:59] [Server thread/INFO]: Saving players
[01:02:59] [Server thread/INFO]: Saving worlds
[01:02:59] [Server thread/INFO]: Saving chunks for level 'Test'/Overworld
[01:02:59] [Server thread/INFO]: Saving chunks for level 'Test'/Nether
[01:02:59] [Server thread/INFO]: Saving chunks for level 'Test'/The End
[01:02:59] [Server thread/INFO]: Saving chunks for level 'Test'/Underdark
[01:02:59] [Server thread/INFO]: Unloading dimension 0
[01:02:59] [Server thread/INFO]: Unloading dimension -1
[01:02:59] [Server thread/INFO]: Unloading dimension 1
[01:02:59] [Server thread/INFO]: Unloading dimension -100
[01:02:59] [Server thread/INFO]: Applying holder lookups
[01:02:59] [Server thread/INFO]: Holder lookups applied
[01:02:59] [Client thread/INFO]: Mw.close: closing...
[01:02:59] [Client thread/INFO]: waiting for 204 tasks to finish...
[01:03:00] [Client thread/INFO]: done
[01:03:01] [AromaBackup-Schedule/INFO]: Stopping Backup Schedule.
[01:03:06] [Server thread/INFO]: Starting integrated minecraft server version 1.7.10
[01:03:06] [Server thread/INFO]: Generating keypair
[01:03:06] [Server thread/INFO]: Injecting existing block and item data into this server instance
[01:03:06] [Server thread/INFO]: Applying holder lookups
[01:03:06] [Server thread/INFO]: Holder lookups applied
[01:03:06] [Server thread/INFO]: Loading dimension 0 (Test) (net.minecraft.server.integrated.IntegratedServer@1568ce63)
[01:03:06] [Server thread/INFO]: Loading dimension -100 (Test) (net.minecraft.server.integrated.IntegratedServer@1568ce63)
[01:03:06] [Server thread/INFO]: Loading dimension 1 (Test) (net.minecraft.server.integrated.IntegratedServer@1568ce63)
[01:03:06] [Server thread/INFO]: Loading dimension -1 (Test) (net.minecraft.server.integrated.IntegratedServer@1568ce63)
[01:03:06] [Server thread/INFO]: Preparing start region for level 0
[01:03:07] [AromaBackup-Schedule/INFO]: Starting Backup Schedule.
[01:03:07] [Server thread/INFO]: Next Backup in: 60 seconds.
[01:03:07] [Server thread/INFO]: Changing view distance to 12, from 10
[01:03:07] [Netty Client IO #1/INFO]: Server protocol version 1
[01:03:07] [Netty IO #3/INFO]: Client protocol version 1
[01:03:07] [Netty IO #3/INFO]: Client attempting to join with 72 mods : [email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],TubesCore@${version},[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],NEIAddons|[email protected],[email protected],NEIAddons|[email protected],[email protected],NEIAddons|[email protected],[email protected],[email protected],@000,[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],bagginses@@MODVERSION@,MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],NEIAddons|[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],MineFactoryReloaded|[email protected],inpure|[email protected],MineFactoryReloaded|[email protected],MineFactoryReloaded|[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
[01:03:07] [Netty IO #3/INFO]: Attempting connection with missing mods [] at CLIENT
[01:03:07] [Netty Client IO #1/INFO]: Attempting connection with missing mods [] at SERVER
[01:03:07] [Client thread/INFO]: [Client thread] Client side modded connection established
[01:03:07] [Server thread/INFO]: [Server thread] Server side modded connection established
[01:03:07] [Server thread/INFO]: Redacted[local:E:f1372e43] logged in with entity id 10189 at (572.1435771476712, 73.0, 202.06040046601336)
[01:03:07] [Server thread/INFO]: Redacted joined the game
[01:03:07] [Server thread/INFO]: SERVER: MineMenu is installed. Sending server response packet
[01:03:07] [Client thread/INFO]: Receiving Server Configuration...
[01:03:07] [Client thread/INFO]: Received server configuration
[01:03:07] [Client thread/INFO]: World changed, resetting
[01:03:07] [Client thread/INFO]: Available server commands:
[01:03:08] [Client thread/INFO]: Mw.load: loading...
[01:03:08] [Client thread/INFO]: generating block colours
[01:03:08] [Client thread/INFO]: loading block colour overrides file /redacted/minecraft/config/MapWriterBlockColourOverrides.txt
[01:03:08] [Client thread/INFO]: generating block map colours from textures
[01:03:08] [Client thread/INFO]: created new MwTexture from GL texture id 19 (1024x1024) (1048576 pixels)
[01:03:08] [Client thread/INFO]: processed 944 block textures, 4280 skipped, 63 exceptions
[01:03:08] [Client thread/INFO]: loading block colour overrides file /redacted/minecraft/config/MapWriterBlockColourOverrides.txt
[01:03:08] [Client thread/INFO]: saving block colours to '/redacted/minecraft/config/MapWriterBlockColours.txt'
[01:03:09] [Client thread/INFO]: net.minecraft.client.gui.GuiIngameMenu
[01:03:09] [Server thread/INFO]: Saving and pausing game...
[01:03:09] [Server thread/INFO]: Saving chunks for level 'Test'/Overworld
[01:03:09] [Server thread/INFO]: Saving chunks for level 'Test'/Nether
[01:03:09] [Server thread/INFO]: Saving chunks for level 'Test'/The End
[01:03:09] [Server thread/INFO]: Saving chunks for level 'Test'/Underdark
[01:03:10] [Netty Client IO #1/INFO]: CLIENT: Disconnected from server, enabling all click actions
[01:03:10] [Netty Client IO #1/INFO]: Updating configuration files
[01:03:10] [Server thread/INFO]: Stopping server
[01:03:10] [Server thread/INFO]: Saving players
[01:03:10] [Server thread/INFO]: Saving worlds
[01:03:10] [Server thread/INFO]: Saving chunks for level 'Test'/Overworld
[01:03:10] [Server thread/INFO]: Saving chunks for level 'Test'/Nether
[01:03:10] [Server thread/INFO]: Saving chunks for level 'Test'/The End
[01:03:10] [Server thread/INFO]: Saving chunks for level 'Test'/Underdark
[01:03:11] [Server thread/INFO]: Unloading dimension 0
[01:03:11] [Server thread/INFO]: Unloading dimension -1
[01:03:11] [Server thread/INFO]: Unloading dimension 1
[01:03:11] [Server thread/INFO]: Unloading dimension -100
[01:03:11] [Server thread/INFO]: Applying holder lookups
[01:03:11] [Server thread/INFO]: Holder lookups applied
[01:03:11] [Client thread/INFO]: Mw.close: closing...
[01:03:11] [Client thread/INFO]: waiting for 138 tasks to finish...
[01:03:12] [AromaBackup-Schedule/INFO]: Stopping Backup Schedule.
[01:03:12] [Client thread/INFO]: done
[01:03:12] [Client thread/INFO]: Stopping!

If that's still not enough, I can attach the whole log, but it's pretty long so I'm not going to do that unless this doesn't help and you really think it will.

from pressure.

I think i (kinda) understand what's going on - If something ticks before the tank, right after it's loaded, the tank doesn't get a chance to figure out it's capacity and it's messing up it's content.

Please try with this version: http://jenkins.bdew.net/job/pressure-1.7.10/48/artifact/build/libs/pressure-mc1710-1.0.1.48.jar

from pressure.

This seems to have fixed it. If anything changes, I'll let you know.

from pressure.