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DISCO3.CO.UK > Webasto Fuel Burning Heater

Something weird going on......!

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Litespeed

Member Since: 04 Oct 2018
Location: Kelso
Posts: 5

Something weird going on......!

Hi guys, recently I drove to the local town to get my covid booster.......filled the fuel tank to full as usual.
Had the jab and drove slowly back home...at the most 15 miles.
Two days later I got into the car and the fuel gauge was down to 3/4 full..!!
No leaks anywhere or even a smell of diesel.
Only thing I can think of is the FBH kicking in. But a) will it do so of its' own accord? and b) if so would it stay on long enough or the consumption be enough to use a quarter tank..?
It was pretty cold for those nights but it hasn't done this before....that I know of.
Weirdly my Sky Q box has been switching itself on at times at 12-2am. Spooky as I live way out in the countryside.
Cheers
David

8th Dec 2021 1:00 pm

grzesiul

Member Since: 11 May 2008
Location: UK
Posts: 6407

2016 Discovery 4 3.0 SDV6 SE Auto Loire Blue

I once got home too my hat off and next day could not find it for a while
to my surprise found it later in the day in my fridge getting a drink lol

so thing are not only weird in your parts

8th Dec 2021 1:03 pm

Pete K

Member Since: 15 Jan 2016
Location: GL
Posts: 10697

2005 Discovery 3 TDV6 HSE Auto Rimini Red

as standard they run only when the engine is running,
unless there is a box of tricks under the bonnet.

Still wouldn't use that much fuel though

8th Dec 2021 1:05 pm

will.i.am

Member Since: 05 May 2016
Location: hertfordshire
Posts: 250

2006 Discovery 3 TDV6 HSE Auto Keswick Green

My FBH definately munches throguh the deisel when it is below 6 degrees - i reckon it would take as much as 10-12 miles off the range of a tank in doing a 15 mile journey wo work in the morning.

8th Dec 2021 1:40 pm

Litespeed

Member Since: 04 Oct 2018
Location: Kelso
Posts: 5

I have noticed the heater starting sometimes when getting in on a cold morning.
So presume it's working as it should.

8th Dec 2021 2:53 pm

spiderlane

Member Since: 17 May 2017
Location: London
Posts: 119

2010 Discovery 4 3.0 TDV6 HSE Auto Buckingham Blue

When I was diagnosing my FBH problem I calculated approximately how much diesel a 30 minute (timed climate) run would use as follows :

From the Webasto service manual 180 seconds at 7Hz should = 40ml of diesel

40 / (180 * 7) = 0.0317ml per pulse

When running Park Heating : 30 minutes at 5.25Hz.

30 minutes = 1800 seconds.

1800 * 5.25 = 9,450 pulses

9,450 * 0.0317 = 299.565ml of diesel

So I guess you could get through it quite quickly in the cold weather but I can't see how it would do 1/4 tank in 2 days.

Cheers
Mark

8th Dec 2021 3:18 pm

Pete K

Member Since: 15 Jan 2016
Location: GL
Posts: 10697

So 0.3l for 30 mins
Though I think it would cut out sooner when Parked

The whole point of the thing is to make the engine more fuel efficient, so it should use loads itself

8th Dec 2021 4:23 pm

Litespeed

Member Since: 04 Oct 2018
Location: Kelso
Posts: 5

New theory......
Diesel theft.......!!
Don't usually lock the car living in the wilds.......will now though.

10th Dec 2021 9:57 am

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