Hmm, it looks like an aftermarket attempt at increasing fuel mileage, the rubber hoses are vacuum and the fuse would indicate that an electrical current is applied. Maybe they filled it with water and/or methanol to be able to increase the ignition timing, the water vapor would enable the timing to be advance with a reduction in pre-ignition. Just thinking outside the box here.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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