In troubleshooting a long draw setup, what should you check if no beer is dispensing?

When troubleshooting a long draw setup where no beer is dispensing, checking the diverted setting of the pneumatic beer pump is critical. The pneumatic beer pump, which helps in delivering the beer from the keg to the tap, must be operating correctly for beer to flow. If the pump is not set correctly or if it has malfunctioned, it won't provide the necessary pressure to push the beer through the lines.

Ensuring that the pneumatic pump is diverted to the correct setting allows for the efficient movement of beer through the system. If the pump is incorrectly configured or malfunctioning, it can completely prevent any beer from being dispensed, highlighting the importance of this check in resolving dispense issues.

While the other options could potentially impact beer service, they do not have as immediate and critical an influence on dispensing when compared to the pneumatic pump setting. The CO2 bottle level is important for carbonation and pressure but may not be the first area to check if there’s a clear issue with the pump. Keg temperature and beer line length are also relevant to overall beer quality and flow, but they are secondary to ensuring that the dispensing mechanism is operational. Hence, troubleshooting the pump setting should be prioritized in this scenario.