I've looked in my electronic Fiat Ducato manual and the sensor involved is K031 which is fitted at the 'top' of the Fuel Filter ( right hand engine bay ( looking 'in' ) behind the Air filter. There are 2 sensors fitted (and they're replaceable ) the one on the left (as you look in) with the 'light duty wiring, is K031 .
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If the injector is threaded in, then as bugsymike says, it will need unscrewing, requiring a special deep socket. The pipes will have to be off for that. If the injector is just clamped in, there will be a clamp at the head, and once removed, the slide hammer tool will be needed to get them out.
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fiat ducato check diesel fuel filter