GR Yaris Theory - Is the Fuel Gauge for the Elderly
- Thread starter GWAD
- Start date
Mintmansam
Obsessed member
- Dec 16, 2021
- 223
- 352
Not bad for a 50 litre tank, though I don't think the stated 50 litres includes the pipe from the filler cap to the tank itself and any expansion tanks etc.
On one of my old diesel Skodas I could get about 6 or 7 litres more in after the nozzle clicked off by persuading it to fill up all the nooks and crannies.
Jip
Devoted member
Well, here is the full story. After my previous comment about trying to go beyond the refill instruction I was guessing the mileage left… I pulled into the petrol station and stopped prior to the pumps to briefly drop off passengers, at this point car went into a limp mode.. 20 meters driven too the pump, stopped, put 51.2lts in drove off too more warnings and no 4WD. Traction light and engine warning light on. Stopped and checked oil and water.
Araf
Obsessed member
Is it wrong that I didn't know the tank was 50 litres? 
I had to Google itIs it wrong that I didn't know the tank was 50 litres?
Mintmansam
Obsessed member
- Dec 16, 2021
- 223
- 352
Araf
Obsessed member
You'd hope so, or it's a risk too far.
Jip
Devoted member
I’m hoping that it was really low, as said, and it had a wobble. Lights n stuff didn’t reset by the next morning or in the evening.
Contacted my dealer and was told to get the car recovered to them. However I disconnected the positive from the battery and all good. ( be careful if you do this as any contact with the bodywork may weld your spanner to the car)
Has anyone else ever run there’s out or so low to have had similar?
Contacted my dealer and was told to get the car recovered to them. However I disconnected the positive from the battery and all good. ( be careful if you do this as any contact with the bodywork may weld your spanner to the car)
Has anyone else ever run there’s out or so low to have had similar?
Yahonza
Dedicated member
- Dec 17, 2021
- 163
- 187
I have never run mine below a quarter tank because I don't want to risk running out of petrol on any of the many trips in the car. Plus there is usually a load of crud at the bottom of the tank, that can get into the injectors if run to empty. Also as said above if the fuel pressure drops below a certain level the engine management system will pick it up as an error. Not much help though 
Lauren
Totally Hooked
The crud at the bottom of the tank, is an absolute urban myth. The fuel pick up is from the bottom of the tank too. I remember years ago replacing a fuel pump on a 25 year old MR2. It was absolutely spotless with not a single grain of anything on the gauze where the pick up is. It was honestly the only part of the car that looked like new.I have never run mine below a quarter tank because I don't want to risk running out of petrol on any of the many trips in the car. Plus there is usually a load of crud at the bottom of the tank, that can get into the injectors if run to empty. Also as said above if the fuel pressure drops below a certain level the engine management system will pick it up as an error. Not much help though
Thank you - I was just about to type the same.
This was true many years ago when cars had a "reserve" on the fuel tank where you had to use cables and levers to move the fuel take up lower in the tank.
The last car I had that did that was a 1968 Rover P5B and the last bike was, err, the BMW I rode this afternoon, but then it is 33 years old.
Modern cars and bikes - anything with a fuel light - takes the fuel from the lowest part of the tank.
Jip
Devoted member
Fuel pressure maybe the reason for the warnings, However the car didn’t run out of petrol and drove too the pump.I have never run mine below a quarter tank because I don't want to risk running out of petrol on any of the many trips in the car. Plus there is usually a load of crud at the bottom of the tank, that can get into the injectors if run to empty. Also as said above if the fuel pressure drops below a certain level the engine management system will pick it up as an error. Not much help though
It still handled well even in just front wheel drive!
Mintmansam
Obsessed member
- Dec 16, 2021
- 223
- 352
Probably a small bip as the fuel moved away from the pick up or a small bit of air got entrained in the system, that’s all it needs to blip it.
Also the discharge pressure is related to the suction level, so it might have tripped due to this, still pumping fuel, but not to required pressure.
I think if you’d been cornering quick and at high rpm/load the car in theory would have shown more noticeable issues, coughing etc the limp mode is preempting this.
Sounds like there’s a lot of hoops you’d have to jump through to cause lean running in the engine.
Cars can fault now before you are even aware of an issue, a friend has a Merc has that has a misfire but it’s so tiny, it’s actually unnoticeable. Only way he knew was a management light.
Jip
Devoted member
Yeh, the tank full before I played roulette with, this time I used pure man maths and wasn’t going to refill it just yet and hadn’t got my jerrycan in the boot
so was lucky. Lesson learnt. I’ll phone dealer and run rhos scenario past them and see if it all adds up from Toyotas side.
But it does prove one thing. Man maths is spot on!
so was lucky. Lesson learnt. I’ll phone dealer and run rhos scenario past them and see if it all adds up from Toyotas side.But it does prove one thing. Man maths is spot on!
Araf
Obsessed member
Garage Roulette is null and void though as you chickened out and had a can in the boot.Yeh, the tank full before I played roulette with, this time I used pure man maths and wasn’t going to refill it just yet and hadn’t got my jerrycan in the boot
But it does prove one thing. Man maths is spot on!
