I can't see why it wouldn't be possible but it's a nuts idea because dropping the fuel tank isn't hard.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
You'd have to take a sizeable holesaw to the centre tunnel bit more or less where the seat backs meet.
![](./images/smilies/spacer.gif)
It'd all be a bit trial and error though and you might end up with lots of holes in your car.
![](./images/smilies/spacer.gif)
The plate that screws into the top of the fuel tank then has 2 hard pipes which go backwards towards the engine bay, you'd need to figure out how you were going to get those out
![](./images/smilies/spacer.gif)
- I imagine your cut would end up needing to be elongated to accommodate those pipes.
![](./images/smilies/spacer.gif)
Then the wiring for the pump goes forward, so you would need to thread this back down the tunnel once your new pump is installed.
![](./images/smilies/spacer.gif)
On top of that you've only got to slip once with the holesaw and you're talking new fuel tank, new fuel pump assembley
![](./images/smilies/spacer.gif)
(hard pipes etc).
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
Just drop the tank, it's not hard! You don't have to split any of the coolant or aircon hoses to do it and emptying the fuel system if your tank doesn't have a drain plug is as simple as disconnecting the fuel line at the filter and bridging 2 pins in the diagnostics port.
![](./images/smilies/spacer.gif)