diff --git a/src/main/java/com/gregtechceu/gtceu/common/cover/FluidRegulatorCover.java b/src/main/java/com/gregtechceu/gtceu/common/cover/FluidRegulatorCover.java
index 0e63eb3cd2a..98124ee6865 100644
--- a/src/main/java/com/gregtechceu/gtceu/common/cover/FluidRegulatorCover.java
+++ b/src/main/java/com/gregtechceu/gtceu/common/cover/FluidRegulatorCover.java
@@ -103,7 +103,7 @@ private int transferExact(IFluidHandler source, IFluidHandler destination, int p
                 continue;
 
             int insertableAmount = destination.fill(drained.copy(), FluidAction.SIMULATE);
-            if (insertableAmount <= 0)
+            if (insertableAmount != supplyAmount)
                 continue;
 
             drained.setAmount(insertableAmount);