Help! testing cold start valve

I have 12volts at electrical connection, now need to see if its spraying gas, have it in a glass jar but don't want engine starting on me, what's the safest way to disable ignition for testing ? its on my 1991 500SL M119. Thanks!

I have 12volts at electrical connection, now need to see if its spraying gas, have it in a glass jar but don't want engine starting on me, what's the safest way to disable ignition for testing ? its on my 1991 500SL M119.
Thanks!

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