fuel management

[hammerhead225]

got a grady white twin ox225 the other day i noticed that my gph was only reading one engine when i push the mode button in dash it does not show port or starboard just shows half the fuel amount like 10 gph when i know it more like 20 gph do you all think it the flow sensor, just wondering why it wont show 0 gph on one engine and 10 gph on other. pushing mode button makes no differnce it still counting total gallons use but just for one engine.any help would be great.
thanks.
hamerhead

[boats.net]

May have a bad fuel flow sensor on one engine or wiring problem.