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wtf oil squirting fuel pumps

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so the last time this happened to me it took forever to figure out where the oil spray under my hood came from. it ended up the little ball bearing on the side of my fuel pump. i replaced it with the can style pump that doesnt have the bearing on the side. now my other 521 is doing it too. what is that thing some sort of check valve or safety crap to not blow out the pump from too much pressure? has this happened to any of you?

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