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MiteVac 7400 - no vac

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I used my mitevac 7400 to pull some water from the bilge of my houseboat.  Emptied the tank, and then tried to finish but now no suction. uses manual no help.  Anyone have on of these and have any ideas. Hate to disassemble if this is something simple. 

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Same unit I use and had the check valve/floaty thing fall off last time I used it. It is pretty simple to pull the lid off and take a look around. Maybe your pressure release valve is stuck open? Maybe the floaty check valve thing is stuck shut? Did you over fill it on last load where the check/ shutoff valve may have engaged? It's like a little pill bottle sized float that is supposed to float up and close valve. It's attached to the lid. Mine had fell off.

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