Hi,
Because this vehicle was made as a cab and chassis and then the ambulance body installed after, I really need you to scan the can-bus. CAN stands for controller area network.
Basically, the different modules are tied together via a few wires. If there are codes stored, this type of scan will identify them. This really needs to be done because things are modified by body companies.
I can tell you that the secondary fuel filter is located on the engine. See pic below. Additionally, there is a primary filter along the frame rail on the driver's side. The primary filter functions as a filter and separator. If there is a drain, it should be at the bottom of this filter.
Let me know if this helps or if you have other questions. Also, if you could add pics of what you are dealing with, it may be helpful for me.
Take care and have a great New Year.
Joe
See pic below.
Image (Click to make bigger)
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Saturday, December 31st, 2022 AT 8:35 PM