[giff1]

I have a 3500 Express and need to remove the Cummings diesel generator. I need to find the shutoff valve to the fuel. I see the two fuel lines coming out of the generator and to a filter but it's hard to see where the fuel lines go from there. Anyone know where the valve is?

[MC1600]

Not sure how it is on the 3500, But on my 4000, it’s on the Aux tank. So you may have to go to where the supply comes from.

[RMS]

Try the top of the port and starboard fuel tanks - should be labelled.

[HNS1]

Both posts are accurate