The big issue some of the 240 guys have is making the isolator fit to stop that vibration/humming sound. I found that heatshrinking the bracket helps as does tiewrapping the crap out of it. I also modified the original rubber to fit the bottom of the Walboro even though it came up a little short it seemed to help. But then again the 240sx pump isn't right next to your ear...that and keeping the tank as full as possible could help...but at these prices I might convert my car to run on milk...lol.