The reply should be from wklaser, but what the heck since i had a similar machine i just try to help you out.
Have you contact them yet?
Is it a warranty machine (3 months for the tube).
Is it not working from the day you receive it?
The pump is suitable and sufficient for this low end machine as the flow rate is within the specification.
Actually this model is meant for engraving on non metallic parts and is not for cutting if you read the specification well.