Michael,
Looks like the blower sucks air from the engine compartment, which is in turn sucking air from the gas tank area. With the engine as a likely source of sparking, you don't want it getting its air from the likely source of gas fumes!
Try to add a tee to the engine/blower line and run that to the gas tank compartment so it can suck from both of them. Block off the hole that will remain from the fuel tank/engine bulkhead.
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