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a D4D diesel engine in a TOYOTA HILUX
well all filters good (air and fuel)
all diesel fuel lines purged of air and at spec pressure
good fuel pumps.
glow plugs not dead,(all)
get the service manual and it covers injector changes steps.
fuse good? to pumps. (lift pumps etc) many pumps can not pump air so must be primed.
i experienced something very similar, we checked everything and found 2 issues . 1 ; on chassis in front of diesel tank is a sediment filter, ours was full of jelly and silt. and also on top of diesel tank through trunk outlet and return diesel pipes partly corroded and pulling air in. swapped sender and cleared silt pot and amazed by the power difference too. hope this helps ,Reuben
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