Mercedes Mullins
The Kerbal Space Program (KSP) is a game that involves space exploration and rocket building. One common issue that players face is a problem with their fuel lines not functioning properly. This can be due to a variety of reasons, such as a symmetry glitch, issues with the fuel system, or incorrect placement of fuel lines. Players have suggested various solutions, including checking the direction of the fuel flow, using the advanced tweakables setting, removing and rerunning fuel lines, and using mods like KIS and KAT to transfer fuel between crafts.
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What You'll Learn
Fuel lines not working—potential symmetry glitch
If you are experiencing issues with fuel lines not working in Kerbal Space Program, there are several potential causes and solutions to consider. One issue could be a symmetry glitch, particularly if you are using 2-way symmetry. In this case, try running each of the fuel lines separately rather than relying on 2-way symmetry. Additionally, ensure that your fuel lines are placed in the correct direction, as fuel only flows through them one way. Check the arrows on the fuel lines to determine the fuel flow direction.
Another potential issue could be related to the way fuel lines are implemented in the game. In Kerbal Space Program, fuel lines are treated as a separate data structure independent of the parts tree, which can make it challenging to find fuel lines attached to a specific part. To address this, start from the vessel's list of fuel lines to identify which parts they are linked between.
If you are having issues with fuel not being detected in a certain stage, the problem might be related to the use of radially-mounted engines instead of stack-mounted engines. To fix this, ensure that the attachment is made on the "fuel-feeding" attachment point. Additionally, for a stack engine, you may need to use a yellow hose for the engine to detect the fuel.
If you are still experiencing issues, try removing all the tanks, lines, and engines, and then setting them up again. This has been reported to resolve fuel line problems in some cases, even if the setup is done in the same way as before.
Finally, if you are using mods, the Kerbal Attachment System mod offers pipes that can be used to transfer fuel between separate crafts. However, if the tanks are part of the same vessel, a pipe may not be necessary, as fuel can be transferred without it.
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Fuel draining from the wrong tanks
If you are experiencing issues with fuel draining from the wrong tanks in Kerbal Space Program, there are several potential causes and solutions you can try.
Firstly, check your fuel flow priorities. To do this, enable "advanced tweakables" in the options, then right-click on an engine and enable the fuel flow overlay. This will show you where the fuel is and isn't going, and you can then set the fuel flow priorities accordingly.
Another potential cause could be a symmetry glitch. If you are using symmetry to place your tanks and fuel lines, try running each of the fuel lines separately rather than relying on 2-way symmetry. It is also recommended to use 2-way symmetry when placing tanks and fuel lines to reduce the chance of glitches.
If you are using docking ports, disable cross-feed in the docking node. Jet engines ignore cross-feed settings and fuel pipes, so ensure that you put the payload on a decoupler and set the root to the payload. This will make the plane tanks the highest priority.
Additionally, you can lock the tanks by right-clicking on them and clicking the green arrow or triangle. This will keep them full until you need them, but remember to unlock them when you want to use them.
If none of these solutions work, you may need to reinstall the game or use a mod like the TAC Fuel Balancer to set the rocket tanks to "input".
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Fuel flow direction
The fuel flow direction in a fuel line in Kerbal Space Program (KSP) is indicated by the little arrows on the fuel lines. Fuel only flows through them in one direction, so if the fuel line is placed in the wrong direction, the fuel will not flow.
If you are experiencing issues with your fuel lines not functioning properly, it may be due to a symmetry glitch. Try running each of the fuel lines separately rather than relying on 2-way symmetry. It is also recommended to use 2-way symmetry when placing each pair for asparagus staging to make running the fuel lines easier and to reduce the chance of glitches.
You can also try removing all the fuel lines from the craft and then re-adding them to see if that resolves the issue. If the problem persists, you can try enabling "advanced tweakables" in the options to set fuel flow priorities and enable the fuel flow overlay to see where the fuel is or isn't going. This should help you identify any blockages in the fuel flow.
Additionally, you can try reversing the fuel flow by going into the VAB, right-clicking on an engine, and changing the fuel flow direction. This can help ensure that the fuel is flowing in the correct direction through the fuel lines.
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Using manual refuel
There are several methods for refuelling in Kerbal Space Program, which can be done on the ground or in space.
Refuelling on the Ground
To refuel on the ground, you can use the Clam-O-Tron or docking ports. To do this, alt+click on the fuel tanks and then use the fuel transfer buttons. If you are playing Career mode, you will need the R and D centre at level 2.
Refuelling in Space
To refuel in space, you have two approaches: fly up a fuel tanker or use ISRU. To use ISRU, follow these steps:
- Land your spacecraft somewhere and right-click on your Drill-O-Matic Mining Excavator(s).
- Click "Deploy" and then right-click on the Convert-O-Tron_250(s).
- Click "Start LF/O" and "Start Monoprop".
- You should start generating fuel.
Alternatively, if you have Kerbal Attachment System and Kerbal Inventory System, and you have fuel ports on your vehicles, a Kerbal on EVA can connect the fuel ports and you can then move fuel from tank to tank. This can be done using the "Advanced Grabbing Unit" (AGU). Go up to your target, get somewhere where the AGU touches the craft, arm the AGU, and shortly after, it should be attached to your craft. Alt + Right-click the fuel tanks, and press "in" to the fuel tank you want to refill.
Troubleshooting Fuel Line Issues
If you are having issues with your fuel lines, it might be a problem with the new fuel system or a symmetry glitch. Try running each of the fuel lines separately rather than relying on 2-way symmetry. You can also try removing all tanks, lines, and engines and then redoing them. Additionally, you can enable "advanced tweakables" in the options to set fuel flow priorities and see where the fuel is or isn't going.
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Fuel lines and struts
The FTX-2 External Fuel Duct is the only fuel line in the game. It allows fuel to be drained off external (side-mounted) tanks or tanks in latter stages. The line must be first connected to the source of the fuel and then to the destination. It is important to observe the arrows on the fuel duct as they indicate the direction of the fuel flow.
Users have reported issues with fuel lines not working properly. One user suggested that this might be due to a symmetry glitch. They recommended running each of the fuel lines separately rather than relying on 2-way symmetry. Another user suggested that the problem might be caused by using radially-mounted engines instead of stack-mounted engines. They also noted that for a stack engine, if you try to radially mount it, it won't see the fuel unless it has a yellow hose.
To troubleshoot fuel line issues, it is recommended to take all fuel lines off the craft and then rerun them to see if the issue persists. If that doesn't work, you can try re-rooting to the stage you want to drain last. You can also try enabling "advanced tweakables" in the options to set fuel flow priorities and enable the fuel flow overlay to see where the fuel is or isn't going.
In terms of struts, there seems to be a strut problem when it comes to fuel lines. When parts are connected with struts, both parts will claim that they allow crossfeed through that attach node, but the attach node itself (the strut) will block the feed. This issue can be resolved through trial and error once you understand the API.
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Frequently asked questions
There could be a few reasons why you can't place a fuel line in KSP. Firstly, check if you have enabled "advanced tweakables" in the options, as this is required to set fuel flow priorities. If that's not the issue, try checking the direction of your fuel lines as fuel only flows through them in one direction. Another potential issue could be a symmetry glitch, so try running each of the fuel lines separately instead of relying on 2-way symmetry.
To enable "advanced tweakables", open the craft file in the VAB and right-click on something that uses fuel, such as an engine. Then, enable the fuel overlay, which will show you where the fuel is or isn't going.
Fuel lines are used to transfer fuel past parts that normally don't allow fuel transfer, such as heat shields. They can also be used to drain fuel from external or side-mounted tanks.
To transfer fuel between vessels, you will need to dock your vessels using docking ports or a "grabbing unit" like the "claw". You will also need at least one upgrade to the science facility to enable resource transfer. Once docked, right-click the source and destination tanks while holding Alt, and use the In/Out buttons to transfer fuel.
