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vicdicdoc

Member

Registered: 2025-03-07

Posts: 26

What is this ?

Last edited by vicdicdoc (2025-03-18 19:19:47)

vicdicdoc

Member

Registered: 2025-03-07

Posts: 26

Re: What is this ?

I should add that this is behind the near side front wheel fixed to the chassis

kenbw2

Administrator

From: Preston

Registered: 2017-11-26

Posts: 1,612

Re: What is this ?

Is it a 2.0 HDi?

I saw on a schematic that the fuel cooler is there. The 1.9s don't have it

Does it look like it has fuel lines going in and out of it?

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2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt

RegW

Member

From: Bristol

Registered: 2024-04-21

Posts: 347

Re: What is this ?

It is a fuel cooler so I'd say it has to be a 2.0 HDI/JTD

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When all else fails, RTFM  - 2006 Expert 2.0 HDI/110

vicdicdoc

Member

Registered: 2025-03-07

Posts: 26

Re: What is this ?

What the H*ll is a fuel cooler ?

kenbw2

Administrator

From: Preston

Registered: 2017-11-26

Posts: 1,612

Re: What is this ?

Never interacted with one either, but my guess is it cools fuel 

I assume the HDI being common rail etc expects a consistent viscosity of fuel and therefore it stops it getting too hot?

I can't remember if the cooler is on the way to the engine or back to the tank

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2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt

RegW

Member

From: Bristol

Registered: 2024-04-21

Posts: 347

Re: What is this ?

I assume the HDI being common rail etc expects a consistent viscosity of fuel and therefore it stops it getting too hot?

Common rail DI pumps running at higher pressures tend to impart more heat to the returning fuel
than conventional pumps which lowers its density and viscosity, so the coolers try and compensate for this
by keeping the fuel within an acceptable temperature range.
The higher temps can also have an effect on plastics if not kept within certain bounds.

I read somewhere that 40-50C is an optimum fuel temp for deisel and if it rises significantly above this,
efficiency drops away in relation to the lower density.
I does occur to me that the ECU should be able to alter electronic injector timings to correct for this but
not sure if this is done on these engines or not.

Last edited by RegW (2025-03-19 20:22:25)

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When all else fails, RTFM  - 2006 Expert 2.0 HDI/110