I have a canon pixma ip 3000 and i need to empty inktank can u help

Ther is no ink tank it is a counter pre set by canon who decided you can only print so many pages . it is artificial number.
reset your machine by the following should help
read all first
First thing you need to do is print an EEPROM information page, step number 2 below.
Once you have an EEPROM print you can reset the waste ink counter, if needed, which is step number 4 below.
Service Mode: This printer has a service mode for service-related settings and for performing test prints. The operator panel buttons are used to enter the desired service mode.
Service Mode Operations
With the printer powered off, hold down the "Resume Button" and press the "Power Button".

While holding down the "Power Button", release the Resume Button" and press the "Resume Button" twice in succession. Now release the "Power Button".

The indicator will blink in green and remain lit in green.

Select one of the following service mode functions by pressing the “Resume Button” the specified number of times.

1 time = Service test print.
2 times = EEPROM information print.
3 times = EEPROM initialization
4 times = Waste ink counter resetting
5 times = Destination settings
6 times = Print head deep cleaning

Then press the “Power Button” one time to perform selected function.

If you press the "Power Button" two times it will take you out of service mode.

This information is listed above in this thread and many times in other Canon threads in this forum. I simplified Canons wording so I could remember the service mode functions easier.

to fix also :
PIXMA IP 3000 service error 5100

I got service error 5100 after a paper jam sometimes 5 times blinking orange. in my PIXMA IP 3000

to fix it
1. Turn off printer
2. Hold down Resume button and press Power button.
3. Keep holding down Power button and let Resume button go.
4. Press Resume button 2 times then let BOTH buttons go.
5. Green lights will flash and then stop blinking.
6. When green lights are solid, press the Resume button 4 times.
7. Press the Power button and the printer should turn off, if not,
press the Power button once more.
8. Your printer should respond as normal..

or: and Also;
Unplug unit, hold power and reset button down
THEN plug it in while still holding both buttons down;
Then to step 3 above.