diff --git a/test/functional/mempool_package_rbf.py b/test/functional/mempool_package_rbf.py
index f4d57262f20..a5b8fa5f876 100755
--- a/test/functional/mempool_package_rbf.py
+++ b/test/functional/mempool_package_rbf.py
@@ -554,7 +554,7 @@ class PackageRBFTest(BitcoinTestFramework):
         self.generate(node, 1)
 
     def test_child_conflicts_parent_mempool_ancestor(self):
-        fill_mempool(self, self.nodes[0])
+        fill_mempool(self, self.nodes[0], tx_sync_fun=self.no_op)
         # Reset coins since we filled the mempool with current coins
         self.coins = self.wallet.get_utxos(mark_as_spent=False, confirmed_only=True)
 
diff --git a/test/functional/p2p_1p1c_network.py b/test/functional/p2p_1p1c_network.py
index f9e782f5248..cdc4e1691d6 100755
--- a/test/functional/p2p_1p1c_network.py
+++ b/test/functional/p2p_1p1c_network.py
@@ -49,9 +49,6 @@ class PackageRelayTest(BitcoinTestFramework):
     def raise_network_minfee(self):
         fill_mempool(self, self.nodes[0])
 
-        self.log.debug("Wait for the network to sync mempools")
-        self.sync_mempools()
-
         self.log.debug("Check that all nodes' mempool minimum feerates are above min relay feerate")
         for node in self.nodes:
             assert_equal(node.getmempoolinfo()['minrelaytxfee'], FEERATE_1SAT_VB)
diff --git a/test/functional/p2p_tx_download.py b/test/functional/p2p_tx_download.py
index efad4e7c0fb..c69d6ff405a 100755
--- a/test/functional/p2p_tx_download.py
+++ b/test/functional/p2p_tx_download.py
@@ -250,7 +250,7 @@ class TxDownloadTest(BitcoinTestFramework):
     def test_rejects_filter_reset(self):
         self.log.info('Check that rejected tx is not requested again')
         node = self.nodes[0]
-        fill_mempool(self, node)
+        fill_mempool(self, node, tx_sync_fun=self.no_op)
         self.wallet.rescan_utxos()
         mempoolminfee = node.getmempoolinfo()['mempoolminfee']
         peer = node.add_p2p_connection(TestP2PConn())
diff --git a/test/functional/test_framework/mempool_util.py b/test/functional/test_framework/mempool_util.py
index baf38bc5259..fe47123e138 100644
--- a/test/functional/test_framework/mempool_util.py
+++ b/test/functional/test_framework/mempool_util.py
@@ -19,14 +19,11 @@ from .wallet import (
 )
 
 
-def fill_mempool(test_framework, node):
+def fill_mempool(test_framework, node, *, tx_sync_fun=None):
     """Fill mempool until eviction.
 
     Allows for simpler testing of scenarios with floating mempoolminfee > minrelay
-    Requires -datacarriersize=100000 and
-   -maxmempool=5.
-    It will not ensure mempools become synced as it
-    is based on a single node and assumes -minrelaytxfee
+    Requires -datacarriersize=100000 and -maxmempool=5 and assumes -minrelaytxfee
     is 1 sat/vbyte.
     To avoid unintentional tx dependencies, the mempool filling txs are created with a
     tagged ephemeral miniwallet instance.
@@ -69,9 +66,13 @@ def fill_mempool(test_framework, node):
     batch_fees = [(i + 1) * base_fee for i in range(num_of_batches)]
 
     test_framework.log.debug("Fill up the mempool with txs with higher fee rate")
-    with node.assert_debug_log(["rolling minimum fee bumped"]):
-        for fee in batch_fees:
-            send_batch(fee)
+    for fee in batch_fees[:-3]:
+        send_batch(fee)
+    tx_sync_fun() if tx_sync_fun else test_framework.sync_mempools()  # sync before any eviction
+    assert_equal(node.getmempoolinfo()["mempoolminfee"], Decimal("0.00001000"))
+    for fee in batch_fees[-3:]:
+        send_batch(fee)
+    tx_sync_fun() if tx_sync_fun else test_framework.sync_mempools()  # sync after all evictions
 
     test_framework.log.debug("The tx should be evicted by now")
     # The number of transactions created should be greater than the ones present in the mempool