Need help to identify and understand components

[MichaelU295]

My RV is a 97 Holiday Rambler Navigator. The manual got no information. Need your help to understand what are the components in my attached picture here (4 of them).

I got my RV in for maintenance service recently, but the filters from item #1 seems to be there forever. So are they serviceable?

Thanks,
Michael

[Thor 37GT]

#1 fuel filter water seperator
#2 Governor
#3 maybe air filter gauge (can't see good)
#4 never seen before

[twinboat]

# 1 is a water seperator, tied to # 4. Google Winn Fuel Systems for more info.

#2 is the air compressor governor. Its the device that controls the pressure in the tanks. It signals the compressor to pump at 90-100 psi and to stop pumping at 120 to 130 psi.

#3 is an air filter monitor. It reads the resistance of air being pulled thru the filter. If the indicator turns red, the filter may be bad and need replacement. They say to reset it once before condemning the filter.

[CountryB]

#4 is the drain and primer for the Racor water/fuel separator (maybe your is different brand - but similar in function)

At least that's what it looks like to me from way over here.

Here's what my coach uses: