V9X Air in Fuel

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Andyjo

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Hi all, does anybody have experience with air entering the fuel system on a V9X motor? Problem is between the filter and HP fuel pump. No sign of any fuel leak on the tangle of fuel lines, I pressured up the lines, still no sign of leaks. Put clear plastic pipe on return line from pump to tank and gravity fed fuel into the filter (clear plastic line). No air in the line to the filter but can see spritzes of air sporadically in the return line. Can air enter anywhere in the pump? Has anybody rebuilt the bosch radial piston pump? Can I get a seal kit for the pump? New pump is $1000+!! I'm assuming that it is a pump issue?
Positive pressure fuel feed to pump reduces the problem but if the pump has to lift the fuel from the tank fuel air contamination is worse. I'm considering installing a 12v lift pump near the tank, any body have experience with that exercise?
 

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