MC 1.16.4
RebornCore 4.5.0
TechReborn 3.6.1

Getting the following exception at the point of placing a pump:

[17:54:41] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.class_148: Ticking block entity
	at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:875) ~[intermediary-server.jar:?]
	at net.minecraft.class_3176.method_3813(class_3176.java:312) ~[intermediary-server.jar:?]
	at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:811) ~[intermediary-server.jar:?]
	at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:670) ~[intermediary-server.jar:?]
	at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257) ~[intermediary-server.jar:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]
Caused by: java.lang.NoSuchMethodError: ru.cr1zyb0y.pipevacuumpump.blocksentity.MachinePipePumpBlockEntity.useEnergy(D)D
	at ru.cr1zyb0y.pipevacuumpump.blocksentity.MachinePipePumpBlockEntity.method_16896(MachinePipePumpBlockEntity.java:56) ~[pipe_vacuum_pump-1.1.1.jar:?]
	at net.minecraft.class_1937.method_18471(class_1937.java:510) ~[intermediary-server.jar:?]
	at net.minecraft.class_3218.method_18765(class_3218.java:429) ~[intermediary-server.jar:?]
	at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:871) ~[intermediary-server.jar:?]
	... 5 more

There was a commit to the RebornCore on Oct 20th with the message:
PowerAcceptorBlockEntity refactored. This will break dependants.

It's likely this commit that's causing the issue, while the method actually still does exist your code (and therefore mod) probably needs to be rebuilt against the updated RebornCore.

If you apply the fix in my Pull request for the RebornCore update then you still run into a new exception when the pump tries to operate.

net.minecraft.class_148: Ticking block entity at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:875) ~[intermediary-server.jar:?] at net.minecraft.class_3176.method_3813(class_3176.java:312) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:811) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:670) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257) ~[intermediary-server.jar:?] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_275] Caused by: java.lang.AbstractMethodError: alexiil.mc.mod.pipes.blocks.TilePipeWood.tryExtract(Lnet/minecraft/class_2350;)V at alexiil.mc.mod.pipes.blocks.TilePipeWood.method_16896(TilePipeWood.java:574) ~[40a3fe09-2d1b-4eba-b517-4b0891ea1610.jar:?] at net.minecraft.class_1937.method_18471(class_1937.java:510) ~[intermediary-server.jar:?] at net.minecraft.class_3218.method_18765(class_3218.java:429) ~[intermediary-server.jar:?] at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:871) ~[intermediary-server.jar:?] ... 5 more

This is pipes related now, not RebornCore.