Water pump power loss.

[Malthe]

Hello there
I need your help.
I have just bought a new waterpump (12v - 22.L/m - 1,4.bar)
Because the old one was loosing pressure.
Onse the new is installed i realize that the pressure is still low and after checking the power going to the pump it reads 10,6-11,0 volts
I then chek the voltage on habitat system and all is good 12,5 - 13,7v.

Anyone experienced anything like this?
Im a carpenter with a little knowledge of electricity.
But can not wrap my head around it.
Any help is much appriciated

 

[f6c]

Welcome aboard

 

[Lenny HB]

The pump will draw about 4 amps when running the volt drop you are seeing is fairly typical in a lot of vans and is due to undersized wiring to the pump. Normally the pump will still run OK.
You could try replacing the wire with heavier ones or doubling up the cables, it it doesn't improve it could be a faulty non return valve or restriction in the pipework somewhere.

 

[DBK]

Sounds like a bad connection somewhere. It will be a pain but you need to trace the wire from battery to pump and check the voltage under load at every junction. But I would start at the fuse box first unless your system uses microswitches in the taps. If it does try turning on the water from a different tap. If this shows a higher voltage then focus on the rogue tap.

 

[TheBig1]

It can simply be a bad joint in the wire between battery and pump or under sized wire used so introducing a voltage drop. Both due to resistance

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[Malthe]

Welcome aboard

Thank you very much

 

[Malthe]

The pump will draw about 4 amps when running the volt drop you are seeing is fairly typical in a lot of vans and is due to undersized wiring to the pump. Normally the pump will still run OK.
You could try replacing the wire with heavier ones or doubling up the cables, it it doesn't improve it could be a faulty non return valve or restriction in the pipework somewhere.

Thank you so much for the help

 

[Malthe]

Sounds like a bad connection somewhere. It will be a pain but you need to trace the wire from battery to pump and check the voltage under load at every junction. But I would start at the fuse box first unless your system uses microswitches in the taps. If it does try turning on the water from a different tap. If this shows a higher voltage then focus on the rogue tap.

Thank you very much for the help

 

[Malthe]

It can simply be a bad joint in the wire between battery and pump or under sized wire used so introducing a voltage drop. Both due to resistance

Thank you for the help

 

[Stealaway]

I then chek the voltage on habitat system and all is good 12,5 - 13,7v.

Have you checked the polarity? Could you have wired the wrong way around?

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