I have a 2.4 litre turbo diesel hilux surf 4x4.
Diesel without a turbo would be damn slow as the turbo gives it all its low down torque.
The fuel pump on my 4x4 is mechanical and runs off engine rpm and is a big sucker. To rebuilt a diesel fuel pump is aound $1500 and to buy a new one is around $3500, so they are very different to a petrol fuel pump.
I say ditch ur current engine and get 1 that already turbo charged!!