All I can suggest is to remove the pump & bracket and extract the broken bolt. Usually, they break because somebody puts in a bolt that's too long; it bottoms w/o tightening the bracket, so they torque it until the head breaks off.
If enough is sticking out after you get the bracket off, you can try vice grips, stud puller, etc. to unscrew what's left. If not, you'll have to try to drill into it and get it out w/ an easyout or the like.
While it is preferred that you drill using a left-hand drill, in my experience the bolt is always so stuck that it makes no difference whether you use a left- or right-hand drill. Sears carries a combination drill/screw extractor - I've not tried them yet.
You can also try using a #409 Dremel bit to cut a slot in the end and try to use a screwdriver bit to unscrew it. Penetrating oil, hot wax, etc. might help too.
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