How do you remove captiva fuel tank - 2003 Isuzu Rodeo

Fuel transfer pump if you can get it down the filler neck.

https://www.google.com/search?q=fuel+transfer+pump

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problems include
insufficient cranking speed
incorrect fuel pump pressure to the injectors---25,000 psi--
crank position sensor problem
glo-plugs inoperative
air in the fuel system
fuel tank not venting
ECM problems

run the fault codes to find the area of the failure

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

Unfortunately, it's usually the sending unit that's gone bad, it's inside the gas tank.
Very few vehicles have an opening in the floor directly above the gas tank to pull the sending unit and pump. Usually you have to jack up the vehicle and drop the gas (petrol) tank.
The replacement part is cheap and a mechanic should be able to do the repair for a decent price. They have to remove most of the petrol before removing the tank so I would get the tank close to empty before bringing it in. (I know, without a gage it's hard to guess)

There is no fuel drain plug. To remove the fuel from the fuel tank you will need a fluid evacuator or similar to pump it out.


Mityvac


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This depends on the vehicle. Some are under the hood near the firewall and a lot of the newer vehicle it is located under the vehicle under the car near the rear passenger wheel in the fuel line coming from the fuel tank. I hope this helps.

I'm 99% sure it's in the gas tank.

You're in big trouble here.
At the very least, the tank will have to be drained and the fuel lines flushed and bled. At worst your injectors have been burnt and require replacement, not to mention a complete engine overhaul.
I strongly suggest you contact a lawyer. This could very well be a more expensive repair than the vehicle is worth.

Sorry I couldn't have brought you better news.

I also have a Chevy Captiva 2L Diesel but with the auto box. The MPG on that one is abysmally bad! I bought it a few weeks ago with just under 30K miles on the clock (2007 model), and it returns around 230 miles on a full tank! That's around 17 MPG and probably on par with a Hummer!!
I was expecting the auto box to be less efficient than the manual of course but not to consume twice as much. Anyone out there with any ideas as to why this could be? I was actually already checking under the car to see if it loses fuel... We live in the suburbs and our trips can be considered a mix of urban and extra urban (they are admittedly on the short side and from a cold winter start; still, this doesn't justify the extremely low MPG). The car seems adequately powered for its weight and considering the small'ish engine and auto box.
Thanks!