Diesel injector problem

Took two injectors out today to see if they were working correctly.cleaned them up and put them back.now seems like I've got more black smoke and when I accelerate hard the engine dies.could it be overfueling.there also a fuel return on each injector.does anyone know if fuel actually returns to the pump through these.none comes out of mine.don't know whether to put new injectors in but best price I can find for bosh ones is £81each.any advice please.

You should be getting fuel out of the returns. Some engines return 4 times as much fuel as they use. I would suggest that maybe the injectors are stuck open. Are you sure you put them back together properly? Might be worth getting them checked out by a diesel specialist. Word of warning though, get a price first.Sometimes works out cheaper to get new ones rather than get old ones tested and reconditioned.

diver said:

You should be getting fuel out of the returns. Some engines return 4 times as much fuel as they use. I would suggest that maybe the injectors are stuck open. Are you sure you put them back together properly? Might be worth getting them checked out by a diesel specialist. Word of warning though, get a price first.Sometimes works out cheaper to get new ones rather than get old ones tested and reconditioned.

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Checked that they were spraying diesel before putting them back.why would it cut out when accelerating hard.