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LPFP fault
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hugeviking
 


Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482

United Kingdom 2006 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3
LPFP fault

Hello all, hope you are having a good christmas. Thumbs Up

So to question, looks like the LPFP has failed, there is no hum of it working when i initially turn the key, and absolutely nothing comes out of the pressure test point, bone dry.

What i dont know is whether it is the pump that has failed or any component that controls it.
Because it is not working, presumably i cannot check for amp draw ?? The fuse is ok but should i get 12 volts at the fuse? I have swapped the relay.
Would a faulty pressure regulator on the rail cause complete failure? can i bypass this to check?

Have given the fuel tank a good thump Shocked

I have read Robbies excellent guide. Thumbs Up

Hope someone can help Bow down

Andi.  
Post #189545830th Dec 2017 3:04 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20841

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Ideally, you need to access the connectors to check for a good 12v feed and earth at the top of the pump

If you have good power And earth, suspect the pump to have failed Thumbs Up My D3 Build Thread

TDV8 Retrofit Build Thread  
Post #189551430th Dec 2017 6:06 pm
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hugeviking
 


Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482

United Kingdom 2006 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

Many thanks for that DM Thumbs Up
I believe there are some connectors near the tank, i will check those first, (easiest?)if no power i will check the drivers wheel arch ones, then drop the tank and check the connectors there. Hope that sounds logical.
Can you point me to the correct wire colours for live/negative on the connectors/wires.

Much appreciated,

Andi.  
Post #189559330th Dec 2017 9:39 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20841

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

White/Purple is +12V
Black is earth

Thumbs Up My D3 Build Thread

TDV8 Retrofit Build Thread  
Post #189561630th Dec 2017 10:58 pm
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hugeviking
 


Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482

United Kingdom 2006 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

Brilliant, many thanks for that Thumbs Up

Andi.  
Post #189569431st Dec 2017 10:02 am
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hugeviking
 


Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482

United Kingdom 2006 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

Should i worry that the HPFP may have run dry while i tried to start the engine.

Andi.  
Post #189602231st Dec 2017 9:29 pm
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