I believe B is the bowl vent and B1 is an overflow. To get the most thinner in, you need to disable the fuel pump, start the car and let it run until it quits. Then put the thinner in B until it comes out B1. Maybe you can put vicegrips on a rubber fuel line to stop the flow of fuel. What ever you need to do to stop fuel from keeping the bowl full of gas.
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84 500 SEL (307,xxx miles)
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