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FBH aspirating/leaking unburned diesel (slight drip)
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jamesj74
 


Member Since: 28 Jun 2013
Location: Derbyshire
Posts: 89

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Santorini BlackDiscovery 4
FBH aspirating/leaking unburned diesel (slight drip)

As the title states, my 54 plate D3 has developed a diesel leak from the FBH exhaust in the wheel arch. I have pulled fuse 28 to hopefully stop any more diesel appearing on my drive/elsewhere. I suspect the heater needs a service (it’s not been serviced ever afaik), it was still burning diesel, but I suspect it’s not a clean burn hence the leak. Does that sound likely/plausible?

I’ve started the removal process tonight and have the seal kit and 20mm bypass pipe ready, though I may yet get my local Indy to complete the removal as I just watched the video on the subject and saw how much coolant will end up on my drive. Don’t want to poison any local wildlife...
 Smoked swooshy side repeaters
LEDs
Sill protectors
Tinted lights
GAP IID BT 3
LRP Tailgate release
RedTiger Dash Cam 
 
Post #22235929th Apr 2021 7:57 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Fuel from the exhaust sounds like it has been overprimed! Has your burner been running very recently? I ask as a long run cycle usually burns off any residuals in the exhaust and burner.

Diesel is only pumped when the burner starts!
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #22236079th Apr 2021 9:41 pm
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jamesj74
 


Member Since: 28 Jun 2013
Location: Derbyshire
Posts: 89

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Santorini BlackDiscovery 4

Yes, on cold mornings it’s been smoking away as normal.
 Smoked swooshy side repeaters
LEDs
Sill protectors
Tinted lights
GAP IID BT 3
LRP Tailgate release
RedTiger Dash Cam 
 
Post #22236189th Apr 2021 10:40 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

You can download the free webasto diagnostics online, then with the adapter and lesds from the site shop run the heater for 20 mins until it burns off the crud and any residual fuel.

If you're still seeing a fuel drip it's not from the heater.
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #22236219th Apr 2021 11:36 pm
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jamesj74
 


Member Since: 28 Jun 2013
Location: Derbyshire
Posts: 89

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Santorini BlackDiscovery 4

It’s 100% coming from the heater exhaust. I have seen it dripping from the exhaust pipe with my mk1 human eyeball. There’s no sign of diesel in the engine bay. Since I pulled fuse 28 it’s stopped dripping.
 Smoked swooshy side repeaters
LEDs
Sill protectors
Tinted lights
GAP IID BT 3
LRP Tailgate release
RedTiger Dash Cam 
 
Post #222362810th Apr 2021 1:54 am
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

The thing is there is no diesel in the burner unless its actually running, or you are priming it with diagnostics!

The introduction of fuel is the last operation of the start up sequence, and if there's any fault detected in the heater this final step is prevented.

It's possible the fuel feed pipe is ruptured and spilling onto the exhaust downpipe, giving the impression it's leaking from within the exhaust?
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #222362910th Apr 2021 2:06 am
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8043

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Mouse attack? Shocked check the rubber pipe that feeds the heater, may have gone hard and brittle with age, can be a source of fire Thumbs Up
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #222363010th Apr 2021 5:04 am
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jamesj74
 


Member Since: 28 Jun 2013
Location: Derbyshire
Posts: 89

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Santorini BlackDiscovery 4

That pipe is fine. No damage or leaks there.
 Smoked swooshy side repeaters
LEDs
Sill protectors
Tinted lights
GAP IID BT 3
LRP Tailgate release
RedTiger Dash Cam 
 
Post #222365910th Apr 2021 9:22 am
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jamesj74
 


Member Since: 28 Jun 2013
Location: Derbyshire
Posts: 89

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Lux Auto Santorini BlackDiscovery 4

Similar setting, sounds the same. Inefficient burn, white smoke, unburnt fuel, exhaust pipe becomes a fuel condenser, diesel on drive.

https://www.caravanersforum.com/viewtopic.php?t=80841
 Smoked swooshy side repeaters
LEDs
Sill protectors
Tinted lights
GAP IID BT 3
LRP Tailgate release
RedTiger Dash Cam 
 
Post #222366610th Apr 2021 10:37 am
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi

Don’t know if it’s any use to u, but a few years back I noticed some fuel dripping off the FBH exhaust and after removing the wheel arch liner I found a fuel pipe connector tucked away that was leaking

See that it tracked down the chassis rail and down the FBH exhaust

Also clutching at straws but just an idea if u can test the fuel quantity flow rate to ensure the fuel pump is pulsing correctly and not letting by / faulty

Of course the other members here are a lot more experienced than myself , it was just that leaking connector and u saying it dripping off the exhaust sounded very similar so wished to at least share just in case u wasn’t aware of that hidden connector

Also found this , think it the correct model

https://www.butlertechnik.com/downloads/We...Manual.pdf

Hope it helps

Ps, drew a yellow line on the pic of how the fuels route that it took





  

Last edited by gstuart on 10th Apr 2021 2:19 pm. Edited 1 time in total 
Post #222369810th Apr 2021 1:56 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

PROFSR G wrote:
The thing is there is no diesel in the burner unless its actually running, or you are priming it with diagnostics!

The introduction of fuel is the last operation of the start up sequence, and if there's any fault detected in the heater this final step is prevented.

It's possible the fuel feed pipe is ruptured and spilling onto the exhaust downpipe, giving the impression it's leaking from within the exhaust?


Hi mate

Hope ur good

Me as always being a pain, lol, can I pick ur wise brain plse

Could a faulty dosing pump cause this at all please, ie if it’s letting by / faulty , therefore as it pulses isn’t shutting down correctly so allows more fuel in that it should so overfills and exits the exhaust

Will that software allow u to see what the flow rate is plse

Know I found on mine a leaking FBH fuel pipe connector that had tracked down the chassis rail and onto the exhaust , didn’t even know it was there as tucked away , only noticed it when I was replacing my front struts

As always apologises for the daft question, Plse forgive me Laughing

Stay safe Thumbs Up
   
Post #222369910th Apr 2021 2:01 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

It might appear to be running and trying hence the smoke, but it was most likely not running properly if at all, if it was actually running/burning there would no dripping diesel.
Mine does not smoke, every now and then you might get a whiff but thats it.

I have had this same failure recently on a boat webasto heater, and it was the flame sensor dud, 75 bloody quid plus gaskets = chuck it in the bin and fit a new chinese one.

On some diesel burning heaters the flame sensor and the glow plug are one and the same thing.
  
Post #222370210th Apr 2021 2:14 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4580

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

gstuart wrote:


Hi mate

Hope ur good

Me as always being a pain, lol, can I pick ur wise brain plse

Could a faulty dosing pump cause this at all please, ie if it’s letting by / faulty , therefore as it pulses isn’t shutting down correctly so allows more fuel in that it should so overfills and exits the exhaust

Will that software allow u to see what the flow rate is plse

Know I found on mine a leaking FBH fuel pipe connector that had tracked down the chassis rail and onto the exhaust , didn’t even know it was there as tucked away , only noticed it when I was replacing my front struts

As always apologises for the daft question, Plse forgive me Laughing

Stay safe Thumbs Up


Hi Gary.

All good here thanks, hope you are too!

The short answer to your question is no. If there is any issue with the dosing pump this would be picked up by the unit during the pre start-up test sequence.

I would agree with what lynalldiscovery says, as there should be no smoking from a regularly used burner provided is is allowed to reach full temperature before shutdown i.e. Avoid short journeys, or keep it lit until full temp is reached. Thumbs Up
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #222372210th Apr 2021 3:45 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

lynalldiscovery wrote:
It might appear to be running and trying hence the smoke, but it was most likely not running properly if at all, if it was actually running/burning there would no dripping diesel.
Mine does not smoke, every now and then you might get a whiff but thats it.

I have had this same failure recently on a boat webasto heater, and it was the flame sensor dud, 75 bloody quid plus gaskets = chuck it in the bin and fit a new chinese one.

On some diesel burning heaters the flame sensor and the glow plug are one and the same thing.


Ah i see , many thanks, same here with mine where it doesn’t smoke and indeed also get the very occasional smell if I’m sitting at traffic lights

Ouch red the cost of the sensor
   
Post #222372510th Apr 2021 3:51 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

PROFSR G wrote:
gstuart wrote:


Hi mate

Hope ur good

Me as always being a pain, lol, can I pick ur wise brain plse

Could a faulty dosing pump cause this at all please, ie if it’s letting by / faulty , therefore as it pulses isn’t shutting down correctly so allows more fuel in that it should so overfills and exits the exhaust

Will that software allow u to see what the flow rate is plse

Know I found on mine a leaking FBH fuel pipe connector that had tracked down the chassis rail and onto the exhaust , didn’t even know it was there as tucked away , only noticed it when I was replacing my front struts

As always apologises for the daft question, Plse forgive me Laughing

Stay safe Thumbs Up


Hi Gary.

All good here thanks, hope you are too!

The short answer to your question is no. If there is any issue with the dosing pump this would be picked up by the unit during the pre start-up test sequence.

I would agree with what lynalldiscovery says, as there should be no smoking from a regularly used burner provided is is allowed to reach full temperature before shutdown i.e. Avoid short journeys, or keep it lit until full temp is reached. Thumbs Up


Hi den

Good to hear ur ok mate , have been trying to put bits away in that new tool cabinet i got

Thank u and makes sense when u explain it like that

With mine , odd occasion of smoke on first start but that’s it , oh and occasional smell when sitting at lights but hardly know it’s on

Also remember to keep the fuel tank above the low level light as I didn’t realise at first when that light appears it also knocks off the FBH Whistle

Many Thanks as aways for the fantastic explanations Thumbs Up

Stay safe
   
Post #222372710th Apr 2021 3:57 pm
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