Game version: 1.20.1
Forge version: 47.2.14
Problem mod version：1.2e

Issue details:
The pumpjack couldn't work correctly in multiplayer game.It has animation and sound effects, but it just doesn't work.

did you make sure you built the pumpjack correctly in an oil chunk, with an open output on the copper casing with a pump pulling out of it?
also last time I checked pumpjacks didn't have sound effects (yet)

Oh so it just doesn't work on the server side as the animation and sounds are on the client side, that's wierd as the fuel types are on the server

Sorry, my mistake. What I want to say is actually diesel engines. To be precise, this issue is caused by both this MOD and Mekanism MOD(Both versions are up-to-date). When I installed both on the server, all types of diesel engines no longer work.

When I installed this mod alone, the diesel engine was running normally, but when I installed Mekanism, even the original working diesel engine stopped working.
I use diesel, which is a supported fuel in JEI

I seem to be having the same issue on 1.18.2. haven't checked if Mekanism is the cause, but it is in the pack and this is the exact issue i am facing on a multiplayer server