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foxhound



Member Since: 02 Mar 2013
Location: United Kingdom
Posts: 143

United Kingdom 1995 Defender 110 300 Tdi SW Alpine White
Fuel System Advice Needed Please

I have a 1995 300 TDI defender 110. Up to a few months ago I was getting 30 MPG ‘daily driving’. Sadly, the vehicle failed the MOT on emissions grounds. To cure the emissions problem I had to replace the turbo ( a vain had seized), recondition fuel injectors (they were 20-25% out), and recondition the fuel pump. At the same time I also had the engine carbon cleaned.

After all this work, the increase in power was phenomenal and the emissions were virtually zero but this came at a cost — I now get 25 MPG daily driving (and I consciously keep my foot off the accelerator pedal!).

I would like to get back to the 30 MPG I had (even if it means sacrificing some power).

All advice welcome as I know naff all about fuel systems. 110 Defender 300tdi & modified Trailer Widetrack mk3 & maggiolina rooftent

Post #692813 12th Mar 2018 2:53pm
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jst
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Member Since: 14 Jan 2008
Location: Taunton
Posts: 4611

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Not sure on this other than maybe the pump was tweaked before and is now std? But then it would feel less grunty after surely?

Anything else changed/been added? Tyres/air intake?

How does a vane seize on a 300? Assuming std turbo? Cheers

James

www.4x4adventures.co.uk
110 XS Utility
90 tdci Softtop

Post #692939 12th Mar 2018 9:50pm
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Blackhat90



Member Since: 31 Dec 2016
Location: Forfar
Posts: 50

Scotland 1995 Defender 90 300 Tdi HT Epsom Green

I think you were doing really well at 30mpg,, i monitered my fuel consumption years ago, best was 32mpg [ on motorway @55mph] ,, normal driving 27/-29 mpg. , the best figures i get ,is in the summer i remove the front prop , and lock the center diff, Then i get about 34mpg,

Post #692969 12th Mar 2018 11:16pm
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foxhound



Member Since: 02 Mar 2013
Location: United Kingdom
Posts: 143

United Kingdom 1995 Defender 110 300 Tdi SW Alpine White

jst wrote:
Not sure on this other than maybe the pump was tweaked before and is now std? But then it would feel less grunty after surely?

Anything else changed/been added? Tyres/air intake?

How does a vane seize on a 300? Assuming std turbo?


Hi. No nothing else changed at all. I saw the old turbo. the vane had seized half open and nothing would free it. No idea how that happened nor when! 110 Defender 300tdi & modified Trailer Widetrack mk3 & maggiolina rooftent

Post #693037 13th Mar 2018 11:04am
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foxhound



Member Since: 02 Mar 2013
Location: United Kingdom
Posts: 143

United Kingdom 1995 Defender 110 300 Tdi SW Alpine White

Blackhat90 wrote:
I think you were doing really well at 30mpg,, i monitered my fuel consumption years ago, best was 32mpg [ on motorway @55mph] ,, normal driving 27/-29 mpg. , the best figures i get ,is in the summer i remove the front prop , and lock the center diff, Then i get about 34mpg,


that center diff trick is worth remembering. thanks 110 Defender 300tdi & modified Trailer Widetrack mk3 & maggiolina rooftent

Post #693038 13th Mar 2018 11:05am
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Blackhat90



Member Since: 31 Dec 2016
Location: Forfar
Posts: 50

Scotland 1995 Defender 90 300 Tdi HT Epsom Green

Yeh, it works fine, Cool free"s up more bhp too, and i"v been doing this for 5 years now, with no damage to transmission ,,

Post #693085 13th Mar 2018 4:08pm
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jst
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Member Since: 14 Jan 2008
Location: Taunton
Posts: 4611

2011 Defender 110 Puma 2.4 USW Stornoway Grey

foxhound wrote:
jst wrote:
Not sure on this other than maybe the pump was tweaked before and is now std? But then it would feel less grunty after surely?

Anything else changed/been added? Tyres/air intake?

How does a vane seize on a 300? Assuming std turbo?


Hi. No nothing else changed at all. I saw the old turbo. the vane had seized half open and nothing would free it. No idea how that happened nor when!


The wastegate you mean maybe? Vanes are fixed on a 300 turbo.

Are you driving it quicker/differently? Assuming wastegate in above you will now get more boost so more go as it actuates fip pin. Before you would of had less boost and used less fuel as fip pin wouldn't move down as much if wastegate was stuck part open. Cheers

James

www.4x4adventures.co.uk
110 XS Utility
90 tdci Softtop

Post #693095 13th Mar 2018 5:48pm
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foxhound



Member Since: 02 Mar 2013
Location: United Kingdom
Posts: 143

United Kingdom 1995 Defender 110 300 Tdi SW Alpine White

James

I probably mean the wastegate but vane was the term used at the garage. I did drive quicker to start but am pacing myself now. Interesting point about more boost and fueling, thanks. Does FIP stand for fuel injector pin or...? thanks again James.

Jerry 110 Defender 300tdi & modified Trailer Widetrack mk3 & maggiolina rooftent

Post #693221 14th Mar 2018 11:06am
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jst
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Member Since: 14 Jan 2008
Location: Taunton
Posts: 4611

2011 Defender 110 Puma 2.4 USW Stornoway Grey

FiP = Fuel injection Pump Cheers

James

www.4x4adventures.co.uk
110 XS Utility
90 tdci Softtop

Post #693360 14th Mar 2018 8:50pm
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foxhound



Member Since: 02 Mar 2013
Location: United Kingdom
Posts: 143

United Kingdom 1995 Defender 110 300 Tdi SW Alpine White

Just had a call from someone suggesting I check the fuel pump timing as this caused a similar problem in his 300tdi of the same age. 110 Defender 300tdi & modified Trailer Widetrack mk3 & maggiolina rooftent

Post #693505 15th Mar 2018 11:18am
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jst
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Member Since: 14 Jan 2008
Location: Taunton
Posts: 4611

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Fuel pump timing could be advanced slightly which would give more power and probably use more fuel.

Does it smoke at all? on start up, over run? underload?

Does it start first turn? Cheers

James

www.4x4adventures.co.uk
110 XS Utility
90 tdci Softtop

Post #693625 15th Mar 2018 9:43pm
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foxhound



Member Since: 02 Mar 2013
Location: United Kingdom
Posts: 143

United Kingdom 1995 Defender 110 300 Tdi SW Alpine White

James

When the work was done there were virtually no emissions, close to zero but mpg was 24 or under. the guy who fitted it all turned a nut on the fuel pump a quarter turn. this reduced fuel use and increased mpg to 26 but it does produce a little more smoke - bigger start up puff. The engine doesn't start quite as quickly as it used to.

does this mean much to you?

best
jerry 110 Defender 300tdi & modified Trailer Widetrack mk3 & maggiolina rooftent

Post #693736 16th Mar 2018 12:05pm
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