Hi David,

You probably do not have air in your system....you are observing fuel vapour bubbles created by the vacuum in your fuel system on the suction side. I have had the same problem with the orbit clunk and I agree with Sandor 100%. We are trying to use these pickups in an application for which they were not designed and are not suitable. Some users a may be able to get away with it with engines that don't demand high fuel flow rates. I have sent you a pm. Hope this helps.


Craig.