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1948 Pontiac glass jar on firewall ? What's it for

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I've got 1948 flat head 6 can't figure out what the glass jar on fire wall is for its got some sort of green oil in it and has a pickup in it that sits at bottom of the jar ,a line from the jar goes to the intake with a  tee valve then counties to the fuel pump then out of the top of fuel pump to a caped off line ? the glass is off in my pictures , thanks guys if anyone can help that would be unreal ! 

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just a guess, some kind of top oiler.  what does your service manual say?

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Marvel Mystery Oil, (MMO) offered a unit similar to that for many years.  Apparently other companies had them had well.

 

 

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