[C320-list] Engine stall only under load

[Donald Poole]

Perkins M30. I can idle for hours regardless of RPM (1000, 1500, 2000,
2500) but she stalls when I am underway. I have changed both primary and
secondary fuel filters and the fuel lift pump. still stalls. Anyone have a
suggestion of what I can try next. I'm thinking there may be a fuel tank
problem ( vent or pick up line ) That's my next stop. If that's it I'll
post the result. Appreciate any guidance or even just ideas.