Inop gas gauge 08 Prius

I don't think you can remove the bladder I'd like to see that YouTube video I don't think it's a replaceable part You wouldn't get a new one Toyota sells you a new tank The UK doesn't have the bladder might be prohibitive getting a tank in the evap canister and all that that hangs in behind the tank and above it from a UK car anybody ever does want to do this I'll go in with him I'd like to get one or two myself. But I'm thinking there's a tank already in the States that should be able to do this duty matrix Yaris something I just haven't had the time to really really look into it but the matrix rear sub frame is so close to our Prius generation too it's uncanny much of the suspension and all that can fit so the floor pan It's close to identical

 

Call your local Toyota parts department for a price. They are very expensive.

 

I could probably change the bladder myself sucessfully.
No, you can't.

Hopefully there's a youtube video on how to do it.
There is! But it's labelled as swapping fuel tanks, so find your nearest salvage yard with a gen 2 that doesn't puncture tanks as part of the yard prep and purchase the fuel tank. Install it in your car and call it a day. You can probably get it done for <$150.

Of course, this assumes your problem is truly a failed sending unit.

 

Assuming your Mathis is the one in Texas, then the fuel level sensor is part of the sealed fuel tank. This is true for all North American spec Gen2.

There are no serviceable parts, you can only replace the complete tank assembly. That includes the bladder, fuel pump, filter, pressure regulator, and level sensor. (fairly $$$)

If you're not part of the rust belt, then all of the vapor emissions plumbing on top of the tank can get reused.

I would first confirm that the level sensor is open circuit. Pop out the rear seat base and the access panel underneath. Unplug the connector and use a multimeter to check resistance across the 2 sensor terminals (the brown and the black wires).

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Here's the connector. Normal range for the sensor is 4 - 110 ohms.

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