I have a Campbell Hausfeld MIG Welder 80, The wire will not feed,

Question edited for clarity, name of maker.
Question moved to maker category.

There is a wiring diagram on 12 if this is your model. They all have model numbers.
https://www.campbellhausfeld.com/files/manuals/manual07/970400_1100.pdf

https://www.google.com/search?q=campbell+hausfeld+mig+flux+80+wiring+diagram

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That could be 2 things. Either the switch in feed assembly is bad or the relay inside the unit is sticking.

it will be in torch, fix suitable torch

Hi:
Her's the link to the site; all you need to do is to input the model number.
http://www.chpower.com/manualsearch/

Hi:

Sometimes the drive motor collect a lot of metal dust from the environment and it requires a clean up. Take the tensor off and remove all wire, try to apply compressed air into it and then apply WD40 and run it. Make sure your tensor wheel it's not to tight and that you are using the right wheel size for the wire in use. Another problem rely on the gun liner if this one hasn't been change in 12 months, it is time to replace it, or, if it is not kinked at all, try to use clean air to blast out all metal particles from it. (take off you gas nozzle and gas mixer also known as contact tip holder).
Good luck.
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You could try Canadian Tire where you bought it.
If not there, check to see if the gun is replaceable by contacting the manufacturer through their website..

If the feed motor is not turning, then you'll need to have the unit tested by a repairman to find out why it isn't turning

Check the tension on the drive wheel, you also might need a liner, they are fairly inexpensive

Try to turn up the wire feed and the volts and pull the cup 1/8 inch past the tip