
Microsoft's Flight Simulator X (FSX) is a popular flight simulation game that allows users to experience the challenges of flying various aircraft. One aspect of the simulation that has sparked discussion among players is the fuel system, specifically the ability to transfer fuel between different tanks to maintain balance and optimize performance. While some players have reported challenges with fuel transfer, others have shared solutions and workarounds, such as using specific gauges or coding hidden fuel selectors to manage fuel flow between tanks. This topic delves into the intricacies of FSX's fuel system and the creative approaches players have taken to overcome any limitations.
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What You'll Learn

Refuelling at San Diego Intl. Airport
Refuelling at San Diego International Airport
San Diego International Airport has a wide variety of rental cars for you to choose from, including passenger van rental options and SUV rental options. If you are planning a trip to Catalina Island, you can even find a pre-planned road trip itinerary that will take you from San Diego, up the California coastline, to the island.
When renting a car from San Diego International Airport, it is recommended that you plan to arrive at least two hours before your departure time for domestic flights and three hours for international flights. This will give you enough time to refuel your rental car and return it to the rental car centre, which is located on the northeast side of the airport.
If you are returning your rental car after hours, you will need to lock the vehicle and place the keys in the key drop box located in the return area. It is important to remove all your belongings from the vehicle before returning the keys. The vehicle will be checked in when the rental location opens the next business day, and the customer is responsible for the car until then.
In addition to car rental services, San Diego International Airport also offers lounges that can be accessed through the Priority Pass app. The airport also has a lost and found located on the Ground Level of Terminal 2, near the counters for JetBlue and Delta. Terminals 1 and 2 are not far from each other and can be easily accessed on foot using the pedestrian walkways.
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Setting fuel flow order
Setting the fuel flow order in a flight simulator like FSX involves managing the transfer of fuel between different tanks to optimise performance. This process can be customised to suit the specific aircraft and flight requirements.
To set the fuel flow order, you can utilise a hidden fuel selector by writing specific codes. Firstly, write a code that switches the fuel selector on aircraft reload to the "left tip" and "right tip" tanks. Subsequently, create another code that instructs the fuel selector to switch to the "left main" and "right main" tanks when the tip tanks are empty or low on fuel. This process can be repeated for centre tanks or other tank configurations.
For instance, if you have tip tanks, wing tanks, and core tanks, you can set the system to first draw fuel from the tip tanks, then the wing tanks, and finally the core main tanks. This ensures that the core tanks remain untouched until the fuel from the other tanks is depleted, at which point the fuel from the core tanks needs to be 'transferred' to the wing tanks for the engine to continue functioning.
Additionally, you can use tools like SIMVARS' class in XMLTools to simplify the process of transferring fuel from centre to wing tanks, which can be easily coded for FSX. It is also recommended to monitor fuel usage and plan fuel loads accordingly, taking into account factors such as climbout fuel consumption, reserve fuel, and fuel burn rates at different power settings.
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Learjet 35A fuel panel
The Learjet 35A fuel panel is a complex system that involves multiple tanks, valves, pumps, and switches, all working together to ensure a steady and efficient fuel supply. The fuel panel typically includes the wing tanks, the fuselage tank, and the tip tanks, with fuel being burned primarily from the wing tanks.
One key component of the Learjet 35A fuel panel is the fuel transfer system. This system allows for the transfer of fuel between different tanks to ensure a balanced fuel load and optimal aircraft performance. The transfer of fuel can be done manually by the pilot using switches on the fuel panel. For example, the FUS VALVE switch, when positioned to OPEN, opens both the fuselage valve and the crossflow valve, allowing fuel to flow via gravity from the fuselage tank to the wings. This process leaves approximately 162 pounds of fuel in the fuselage tank.
The Learjet 35A fuel panel also features various lights and indicators that provide critical information to the pilot. For instance, the FUEL XFLO annunciator light illuminates when the crossflow valve is fully open, while the FUEL PRESS light warns of a loss of fuel pressure to the engine, likely due to a failure of the wing jet pump. Additionally, the FUEL FILTER annunciator light alerts the pilot if the fuel filters are clogged or bypassing fuel.
The fuel panel also incorporates jet pumps with orange LED indicators, which flash briefly when activated. A green LED illuminates when the fuselage tank is full, and a white LED indicates insufficient pressure, potentially signalling a transfer failure. These lights are essential for monitoring the fuel system's status and identifying any potential issues.
In terms of coding and simulation, the Learjet 35A fuel panel presents unique challenges. One user reported difficulties in getting the fuel transfer switch to function properly in the simulation, with the switch position not updating correctly and issues with fuel transfer between tanks. Another user suggested using simconnect to write values for specific variables to achieve fuel transfer between the left and right main tanks. The dsd_fuel_dump.gau gauge was also mentioned as a potential solution, though it was undergoing maintenance at the time.
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XML fuel tank transfer
Some users have reported issues with the XML fuel tank transfer feature in FSX. One user reported that they were unable to fill up the tanks after dumping them, even after trying different versions of the dsd_dump_fuel.gau gauge. Another user suggested that the issue might be related to the ini file and recommended using the dsd_dump as a fuel loader and unloader in the fuel panels.
To address the issue of transferring fuel between tanks, one user suggested using simconnect to write values for the variables "FUEL TANK LEFT MAIN LEVEL" and "FUEL TANK RIGHT MAIN LEVEL". This would allow for fuel to be dumped and filled in specific tanks at the same rate.
Another user provided a code snippet that includes the use of the dsd_fuel_dump.gau gauge to manage fuel transfer between tanks. This code includes elements such as the fuel transfer switch, float position, select case, and mouse area.
It's important to note that some users have expressed concerns about compiled gauges being flagged as potential viruses or infected files. It is recommended to exercise caution when downloading and using such files.
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Fuel cross-feed
In a multi-engined aircraft, the crossfeed simply connects one engine to the opposite engine's fuel tank. One would leave crossfeed enabled until the fuel in the active tank is roughly equal to the fuel remaining in the inactive tank. At that point, normal fuel flow is re-enabled.
In some aircraft, such as the 737, the wing tanks need to be full before the centre tank can be filled due to structural integrity and wing bending reasons. In-flight, the aircraft is designed to burn through the centre tanks first while keeping the wing tanks full. Therefore, the centre tank cannot be cross-fed to the wings. However, there is a crossfeed valve that links the left and right sides of the fuel system, allowing both engines to be fed by either the left or right tanks and enabling the correction of fuel imbalances.
In the FSX simulator, users have discussed issues with transferring fuel between tanks. One user mentions that they are unable to fill up the tanks after dumping fuel, despite trying different methods. Another user is coding the fuel panel for their Learjet and has encountered issues with the fuel transfer switch. While the switch functions correctly when turned on, it disappears when turned off, although it does stop transferring fuel.
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Frequently asked questions
To refuel your aircraft in FSX, go to Aircraft/Fuel and Payload and set all tanks to 100%. You can also request a fuel truck by pressing Shift-F.
Fuel transfer between tanks in FSX can be achieved by using simconnect to write values for the variables FUEL TANK LEFT MAIN LEVEL and FUEL TANK RIGHT MAIN LEVEL.
The dsd_fuel_dump.gau gauge dumps fuel from all existing tanks. It can be used to dump left and fill right tanks with the same rate, allowing for fuel transfer between tanks.











































