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When you pull the pump, take the button and spring retainer off the bottom of the pump, then you can see the plunger guide. You'll be able to see if the guide is broken or not.

Could have broken the plunger guide inside the pump. Its made of a very thin metal and if the plunger gets varnish built up, it could have caused friction, which caused it to jam. How many hours are on your unit and how old is the fuel in the tank?

You can get them from AMBAC but they are about $30 a piece. I've put several together without the spacers because they were destroyed and they ran fine. Then I've put some together that needed the spacers to run correctly.