Gas leak at Accel Pump

I just bought a 98 YZ400. When I turn on the fuel there is a gas leak where the little rod goes into the accelerator pump (at the rubber boot). Before I tear this thing down, can I get some suggestions on what the problem might be? Is the diaphragm stuck/bad spring/missing O-ring???????

Ruptured AP diaphragm.

Thanks. The UPS fairy should be delivering one under my pillow soon.

Also, thanks to Dave Hopkins for the insight and parts help.

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