[AnotherUnixGeek]

How does one kill them self with a gas-powered water pump?

Pump was probably used to push carbon monoxide from the tailpipe of his car to the interior of his car, while he sat inside with the windows rolled up.

[Robert DeLong]

Perhaps, but this is what I envision when I think of a gas powered water pump.

[Robert DeLong]

I guess it was setup like this.

[wideminded]

How does one kill them self with a gas-powered water pump?

It didn't involve a connection to the tail pipe. I was going to say how did work, but since you're asking how to commit suicide, I'll pass.