Leaks are your first clue, and the operations of the device your using it for, slows down or is not as powerful.
how do i know the fuel pump is going bad in a 1998 ford expedition eddie bauer?
check the the pump pressure at the rail
When a fuel pump is bad the vehicle will not start. A fuel pump that is going bad may cause the vehicle to shut off while going down the road.
It is rare for a water pump not to work however a water pump going bad will leak coolant and can be noisy from bad bearings.
Noisy pump, hard starting, stalling.
You just don't know until a mechanic tells you.
In most cases the water pump will start to leak coolant when it is going bad.
Hard starting, stalling and eventually it simply will not run. Change the filter before assuming the pump is bad.
To determine if the hydraulic pump on a John Deere 1830 is faulty, check for signs of leaks, unusual noises, or a decrease in hydraulic pressure. You can also test the hydraulic system by observing the performance of hydraulic functions; if they are sluggish or unresponsive, this may indicate a pump issue. Additionally, inspect the fluid condition and level, as contaminated or low fluid can affect pump operation. If these symptoms persist, consider consulting the service manual or a professional technician for further diagnosis.
If the fuel pump becomes noisy you can rest assured it is going bad. But, the pump maybe going bad and not make any noise at all. Anytime you have a problem with fuel delivery, first thing to do is replace the fuel filter. After replacing the fuel filter a fuel pressure test will verify the condition of the pump.
In most cases the pump will start leaking coolant out of the weep hole and or you may hear the pump bearing going bad.
You will hear valve train clatter.