problems

[amj32]

i have a d turbo engine from a xantia. fitted with a mechinacal bosch pump havnt had it apart but bought it as a gov modded and pin grind was going great for a couple weeks now it pull as normal till it hits aprox 2500rpm bit of black smoke up till the boost starts to drop then none . dont have a rev counter but 60 mph 5 gear starts dropping from 20psi gradually then boost drops off as if its not getting fuel wont pull over 75 mph . new filter lines blew back to tank . thinking pump internals gov spring /rack ? . has anyone had similar issues or solved any advice ? thanks .

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