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- Mar 8, 2007
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The double sump is a rear sump pan. In the fox body (80's mustang) the crossmember ran under the engine and it needed to be a rear sump engine. Part of the 302 design is the front mounted oil pump. That oil pump is lower than the crossmember. So it got a baby sump, just to give a physical space for the pump to live. The pickup for the pump goes over the crossmember and sucks oil out of the big rear sump. The front sump is just a space to hold the oil pump. As it fills up it just overflows into the rear sump. It holds enough oil that a drain plug was added to get rid of the oil during an oil change.
The original Bronco pan is very much like the mustang pan, except there is a trough down the passenger side so the oil that collects up by the pump can be drained out the back without a second drain plug.
Great info sir..