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If you get a third degree burn when you touch the pipe, then it's firing on that one.
A slightly safer way is to spit on your finger and dab it on quickly. If it crackles and fizzes then you know it's hot.
The other things that it's possible to displace when pulling and tugging in there are the vacuum lines to the tap and pump, however I'm not sure it would run at all if one was not connected?
Worth a check though, they run down to the carb manifolds.
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