If you look at the reverse of the fuel pump you will see a 13mm nut holiding a 10mm bolt. undo the 13mm lock nut and turn the 10mm in or out to adjust the mixture, this is easy as you can run the engine with the adjuster lose so you can high rev it and adjust all the black smoke away. dont go too far or your power loss will be devastating, you need to listen to your engine and look for smoke at the same time. i always leave a little black smoke at the high end of the revs this will give you enough power but wont black out the street.
if your disco is a diesel look at the back of the fuel pump located near the osf of the engine, at the rear you will see a 13mm nut with a 10mm adjuster bolt through the centre, loosen the 13mm to allow the 10mm bolt to move and start up the engine, adjust the bolt inwards and rev the engine keep a eye for the black smoke to dissappear but listen to the engine as if you adjust it too far the engine will loose power and labour under load. keep adjusting untill you have no black smoke from the exhaust then open the throttle up fully and listen to the engine see if it revs free or if it sounds under power, if it revs ok tighten the 13mm lock nut and go for a test drive, if it feels numb no power adjust the 10mm bolt adjuster the other way to increase the fuel keeping a eye on your tail pipe for the dredded black smoke. this is always the way to go and will sort out your disco 100% guaranteed unless the pump is faulty this is. all the best mark.if your disco is a diesel look at the back of the fuel pump located near the osf of the engine, at the rear you will see a 13mm nut with a 10mm adjuster bolt through the centre, loosen the 13mm to allow the 10mm bolt to move and start up the engine, adjust the bolt inwards and rev the engine keep a eye for the black smoke to dissappear but listen to the engine as if you adjust it too far the engine will loose power and labour under load. keep adjusting untill you have no black smoke from the exhaust then open the throttle up fully and listen to the engine see if it revs free or if it sounds under power, if it revs ok tighten the 13mm lock nut and go for a test drive, if it feels numb no power adjust the 10mm bolt adjuster the other way to increase the fuel keeping a eye on your tail pipe for the dredded black smoke. this is always the way to go and will sort out your disco 100% guaranteed unless the pump is faulty this is. all the best mark.
Answers & Comments
What size motor? GEMS or Bosch?
If you look at the reverse of the fuel pump you will see a 13mm nut holiding a 10mm bolt. undo the 13mm lock nut and turn the 10mm in or out to adjust the mixture, this is easy as you can run the engine with the adjuster lose so you can high rev it and adjust all the black smoke away. dont go too far or your power loss will be devastating, you need to listen to your engine and look for smoke at the same time. i always leave a little black smoke at the high end of the revs this will give you enough power but wont black out the street.
if your disco is a diesel look at the back of the fuel pump located near the osf of the engine, at the rear you will see a 13mm nut with a 10mm adjuster bolt through the centre, loosen the 13mm to allow the 10mm bolt to move and start up the engine, adjust the bolt inwards and rev the engine keep a eye for the black smoke to dissappear but listen to the engine as if you adjust it too far the engine will loose power and labour under load. keep adjusting untill you have no black smoke from the exhaust then open the throttle up fully and listen to the engine see if it revs free or if it sounds under power, if it revs ok tighten the 13mm lock nut and go for a test drive, if it feels numb no power adjust the 10mm bolt adjuster the other way to increase the fuel keeping a eye on your tail pipe for the dredded black smoke. this is always the way to go and will sort out your disco 100% guaranteed unless the pump is faulty this is. all the best mark.