Re: Water pressure gauge connection 225 efi
If you run the motors with the hose disconnected at the gauge you will fill the line with water. That would probably ruin the gauges ( when reconnected) as they are designed to run on "air pressure".
It is unusual to have both stop working at the same time. Are the lines pinched somewhere?
I am not that familiar with the newer engines, but I would think you can access the lines coming out of the engines by removing part of the engine covers. and blow backwards to remove the water. Could it be possible that they are full of water all the way to the gauges and the gauges are full of water?
Let's back the truck up. There is no mechanism that insures how far up the tube water advances. Actually water will work the meter mechanism and will do so much more accurately than air as water does not compress and air does. The metering mechanism has no idea as to what is applying pressure to it.
The metering mechanism is usually a closed brass semicircle and the meter needle is attached to it. Deflection of the brass chamber (semicircle) causes the needle to deflect.
Removing water pressure from the system allows any water in the system to make it's way out of the system via hydroscophic disposition, meaning that over time, gravity will pull on the water and it will be displaced by air as it makes it's way to the lowest point in the circuit, or exits depending upon the exit route. In the case of loops or dips, the water remains and just goes along for the ride with the trapped air in the circuit.
Mark