After logging out of a world and logging back in or going out of render distance, fuel pumps disconnect from pipes. I tested this with both fluid ducts from Thermal Dynamics and fluid pipes from Immersive Engineering. The fuel pumps must be broken and replaced to fix it; breaking and replacing the pipes does not work. The same thing happens with fluid loaders and unloaders.

I'm using the latest version of Immersive Vehicles, 20.3.0.

Do you remember what the last known-good version was that had these working?

No, sorry. I don't remember if I encountered this bug or not in V19 and I haven't played older versions.

Re-opening as this isn't in the released version. Will close when released.

This issue is fixed in beta 9, at least as far as I've tested with Thermal Dynamics Fluiducts and Immersive Engineering Fluid Pipes. Thank you!

Fixed in V20.4.0.