Make sure the hose barb is not an anti-siphon type...they are crap.
You are sure the primer bulb is good and mounted correctly with arrow pointed up at motor?
The very last thing I would do is cut the deck. I doubt the tank is the problem.
Try cutting the pickup tube 1 inch. I can't imagine there being anything that big in there.
Oh, I had a problem with new tubing for a primer bulb. It had a clear liner that got pushed into the tubing by the hose barb. It blocked the line enough to prevent me from priming.
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