Quote:
Originally Posted by RoverP480
Yes its the in tank pump problem,which also has venturi system that lifts fuel from one side of the saddle tank to the other. If its not working you rely on slosh from one side to the other to keep the UB pump supplied.
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The pump pick up and spill return pipe are both on the same side of the tank - the offside.
The reason the UBP ends up sucking air when the ITP fails and the tank level drops too low is that the self priming valve that sits on top of the ITP is exposed and open - it only shuts with pump pressure when the ITP is working.