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simons17

Member Since: 21 Dec 2013
Location: Beverley
Posts: 29

Fuel pump adjustment

Evening all

Just got the defender back from mot and it has failed on to much black smoke so it will not pass the emissions . The car is a 300 tdi which I believe has had a bit of tuning. I turn down the mixture screw but the black smoke is still present on first press of the peddle. I have read this can be improved by adjusting the boost compensation on the fuel pump.

Any one completed this before and is there any pit fall to watch out for ?

Cheers

Simon

1st Apr 2017 9:01pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8061

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Which party did you adjust? The smoke screw on top, pin or star wheel? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

2nd Apr 2017 6:59am

simons17

Member Since: 21 Dec 2013
Location: Beverley
Posts: 29

I have just adjusted the torque bit on the top with a combo of the mixture screw on the side .

On the top torque bit I turn it counter clock wise by half a turn . The smoke has reduced.

Does this seam about right or would you go further ?

2nd Apr 2017 10:04am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8061

the mixture screw? you mean the full fuel flow screw on the back of the pump? with the anti tamper.

torx - smoke screw - too much here would give black smoke from immediate pull away, so if smoke worse just as you start to accelerate then back off another half turn.

diaphgram inside is the real one you need to adjust so it gives less fuel for boost ratio. its under the 4 screws holding the top on. there are probably marks on it where the needle used to rub on the profile. turn it back to this shallower profile.

i take it air filter is clean? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

3rd Apr 2017 5:11pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8061

https://www.defender2.net/gallery/albums/u...ev%202.pdf

should be of use Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

3rd Apr 2017 5:13pm

simons17

Member Since: 21 Dec 2013
Location: Beverley
Posts: 29

Thanks for the help; this is great info, Ill give this a go

I managed to get it through the MOT with a bit of fiddling.

Ill change the filter as a precaution but it doesn't look bad.

Cheers

Simon

3rd Apr 2017 5:55pm

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