ALL are Thailand built and good quality. A typical diesel hi lux repair for shit fuel is around 12 grand at a dealer and they are doing them regularly. A Nissan diesel fuel pump for instance,depending on model is 3500-6500 aud, all have alloy bodies and cant really be rebuilt to good standard.
Not all Navara's are Thai built. Anything with a 3.0lt V6 diesel or 4.0lt V6 petrol is built in Barcelona, Spain and any dual cab that is an STX regardless of engine is built in the same plant, everything else is built in Thailand. Easy to pick, Barcelona VIN's start with VSK and anything built in Thailand has a VIN that starts with MNT.
Regardless of the manufacturer of the vehicle, (Nissan, Toyota, Mitsubishi) pretty much all the 4 cylinders run a Denso common rail fuel system, some of the lower volume manufactures run Bosch so the cost to repair a contaminated fuel system is the same across all brands and will typically cost you a set of injectors (4x$1000) a high pressure fuel pump ($2500) sacrificial components to replace the injectors and pump ($1000) labour to drop out the tank, clean and flush along with the labor for the fuel system parts ($1200) so you'd be looking at $8k to $9k.
My advice.
Never store any qty of diesel to use at a later time.
Only buy diesel from factory owned reputable fuel suppliers. Ie BP, Shell & Caltex. It's not uncommon for private independents to splash blend biodiesel and kerosene on site.
Resist putting volumes of Alpine blend fuels into your tank.
Never, ever use blended or bio diesel.
Fit a secondary quality filter/sedimentor with a clear bowl that you can visually inspect.
Steer well clear of fuel additives (there nothing more than snake oil)
Do your best to never run them out of fuel. If you do follow the manufactures recommendations to the letter on how to prime the system.
If the engine power is not enough for your purpose, upgrade to a vehicle/engine combination that will do the job you want. Do not chip them up, increase the boost, etc you will pay big time later down the track.
If you accidentally fill with a small volume of ULP, say 10lt's before you realise what you've done, do not start the engine. Push it out the way and have it taken somewhere where the tank can be fully drained and refill to the brim with fresh diesel. Whilst the vehicle may start and run with 5-10 lt's of diesel, it "will" fail fuel components some time in the near future due to the dramatically decreased lubriscosity level of the fuel.
