In my ute I did have surge problems and also use to suk air instead of fuel when opening up the throttle on a 1/4 of a tank,when 1st starting to mod...but when I went to investigate it myself found out that the pump was not intalled properly by the reputable shop....the pump was sitting higher in the swirlpot, so changed the pump to a walbro gss340 it has a larger pickup on the bottom of the pump and have had no dramas since....no surge tank no anything...just the intank pump. Sedans cant do this as theres sit higher, so need a surge tank.