Why don't Dealers want to do warranty work?

[Crazy Dazz]

Now I want say up front, that Wanneroo Mitsubishi are awesome. They have fixed everything on my daughter's Lancer, no problems, no questions asked. And when in for it's capped-price servicing they are excellent and even spot and take on other warranty work without being asked.
But they are the exception. They were owned by the Divigillio family for a long time, so maybe have a different approach?

I don't know exactly how warranty claims work, and maybe it's not the most lucrative, but surely it's still profitable?

But no, rather than undertake paid work, they would rather just shrug and blatantly lie,
And I'm not talking about something that's hard to diagnose, or a judgement call.

The tank sender (or senders) just aren't working correctly. It says the tank is full, even though it's down to about 5%