MANILA, Philippines — There will be a slight increase in the pump prices of diesel and kerosene on Tuesday, oil firms said Monday. Shell, Seaoil, Cleanfuel, and Petrogazz said that diesel prices will go up by P0.20 per liter. The cost of gasoline will be lowered by P0.10 per liter. Meanwhile, the cost of kerosene will be raised by P0.10 per liter. Last week, oil companies raised diesel and kerosene prices by P0.60 per liter. There was no price adjustment for gasoline.