Ditch the T-piece, plumb the MBC direct to the inlet manifold ( there should be a spare outlet, you may need an adapter ) and hopefully this will work.
The T-piece can interfere with continuous supply to the MBC, giving sporadic results.
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Current fleet;
1998 Volvo 940 2.3 LPT (mine)
2003 Peugeot 406 2.2Hdi ( also mine )
2019 Citroen C3 ( wife's )
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