Quote:
Originally Posted by DrFerry
Agreed, but those type of pumps are belt driven, gear driven, or shaft driven. No such 'drive' mechanism appeared visible for the "sucking jet pump" on the diagrams I could see. Which is why I erroneously suspected it was an electrical pump. spammysammich 's mention of it being a 'vacuum' pump was in response to this observation.
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The sucking jet pump is just a check valve. I cut my old one open (ball was flipped like some pics in the OP), it's a hollow metal ball and spring that pushes the ball against a seal. The orientation is such that it could draw fluid in from the bottom and then not let it run back into the pan.
I blew into the new Getrag part to see how well it sealed compared to my old one and it really doesn't hold much pressure.