Anyone know why I would see a .5-.7 gph DECREASE in fuel flow when the aux fuel pump is turned on?
For what it's worth, I actually posed the question to ChatGPT4 and it gave the credible sounding answer below. But I still trust you guys more for now!
For what it's worth, I actually posed the question to ChatGPT4 and it gave the credible sounding answer below. But I still trust you guys more for now!
If you observe a decrease in fuel flow when the auxiliary fuel pump is turned on, it could indicate a few potential issues:
Auxiliary fuel pump malfunction: The electric auxiliary fuel pump may be failing or malfunctioning, causing it to impede the flow of fuel rather than augmenting it. This could lead to insufficient fuel flow to the engine, potentially causing power loss or even engine failure.
Fuel system obstruction: There could be an obstruction or blockage in the fuel system, such as debris or contamination, which is restricting the flow of fuel. This can also lead to insufficient fuel flow, which could cause engine performance issues or even engine failure.
Fuel pressure regulator issues: If the fuel pressure regulator is not functioning properly, it could be causing an imbalance in fuel pressure when the auxiliary fuel pump is turned on, leading to a decrease in fuel flow.
In any case, a decrease in fuel flow when turning on the auxiliary fuel pump is not normal and should be investigated. If you encounter such a situation, consult the aircraft's documentation, consult with an experienced aircraft mechanic, or seek assistance from a qualified aviation maintenance professional to diagnose and address the issue. Remember, it is crucial to ensure the proper functioning of the aircraft's fuel system to maintain safe and reliable operation.