Out of fuel with 2 gallons in the tank

[Simisimi]

I don't normally let my BRZ get down much below 1/4 tank but recently I was on the Interstate and not paying attention to the gauge when "beep" the fuel low indication came on. Withing one minute the car began to buck and loose power. A mile later I was on the side of the road calling AAA. They brought me the standard 2 gallons of 87 octane crap and off I went driving gently the 4 to 5 miles to the closest gas station. I filled the car - it took 9 gallons. I expected it to take about 11+ being a 13.x gallon tank. Since I have a 93 tune and turbo I really wanted as much premium fuel to mix into that 87 octane stuff as possible so I attempted to top it off. By 9.5 gallons the fuel was about to spill out the filler. OK so my math is that ZERO plus 2 plus 9.5 = 11.5. Also isn't the reserve supposed to be about 2 gallons? Anyone have any ideas on why I apparently could not access and use the reserve? My mechanic rattled off something about an issue with the scavenge system in the fuel tank. Only other thing to mention is that my Port Injection fuel pump was replaced with a bigger unit when I went from 7 to just over 9PSI boost. Not sure that would be involved but it's in that area. Help!

[venturaII]

My general experience has been that tanks will almost never hold as much as they're rated for. I believe the rating for 13 gallons is a theoretical full tank, with no air space or anything. However, reality requires expansion room, etc. so the tank will hold less when filling it at a pump. Motorcycle tanks are notorious for this as well.

The apparent lack of reserve after the low fuel light would be more concerning for me though. I'd think there would be something that could be adjusted on the pump/sending unit assembly to give more warning, but you'd have a hard time convincing a dealer to go to all that work and cover it under warranty...

[humfrz]

Well, at least you now know where the NEW "E" is on your car .....


humfrz

[whataboutbob]

I've driven mine down to the point where it took 12.5 gallons. If your in tank pump was replaced are you sure it is properly configured to draw fuel in when the tank is at 2 gallons or less? It might be something to check out.

[strat61caster]

Most I've ever put in my tank at one time has been ~11.4 gallons, but I've never run out of fuel so I don't know how much I had left. Needle was at or slightly below 'E'.

Chalk it up to a life lesson and be more careful? I'm not sure what you really need help with.

[Simisimi]

Perhaps a clear understanding of how the fuel tank, pickup and scavenging work would be helpful. I agree with VenturaII that I'll "have a hard time convincing a dealer to go to all that work and cover it under warranty." and figure being armed with more facts would be good. Another might be what others have seen on this car for distance on reserve. I think one mile is clearly an issue but if I know that normal is at least 40 miles that would be good to be able to say confidently.

[Scenic Driver]

It is not normal for the car to die that soon after the light turns on.

[slyphen]

my fuel light always come on after around 2 gallon as well. thought its normal...

[RobertPaulson]

that's really odd, when my fuel light comes on, it takes between 9.8 and 10.5 gallons to fill up and it comes on with about 1/8 of a tank left on the needle. i normally burn another gallon or so before actually getting to the gas station and on average take about 11 to 11.5 gallons to fill up.

[extrashaky]

Originally Posted by venturaII

My general experience has been that tanks will almost never hold as much as they're rated for. I believe the rating for 13 gallons is a theoretical full tank, with no air space or anything.

It is a ~13 gallon tank with ~12.5 usable gallons of fuel. The bottom 1/2 gallon is not accessible. It's designed that way to allow for sediment and condensation to settle in the bottom of the tank and not be picked up. You put 13 gallons into a dry tank, you can only get 12.5 back out through the motor.

The warning light usually comes on when there is 2 to 2.5 gallons of usable fuel left. There is apparently some variation. If you fill it up right when the light comes on, you should pump about 10 to 10.5 gallons. The most you should ever be able to pump is 12.5 gallons, but that will mean you ran it out of gas or came dangerously close to doing so.

Originally Posted by Simisimi

Since I have a 93 tune and turbo I really wanted as much premium fuel to mix into that 87 octane stuff as possible so I attempted to top it off. By 9.5 gallons the fuel was about to spill out the filler. OK so my math is that ZERO plus 2 plus 9.5 = 11.5.

Perhaps the "two gallons" from AAA was actually three gallons. Can you really be sure how much they put into your tank?

If everything is working properly, the car knows how much usable fuel it has left, and you can read that directly with Torque. I run Torque with the fuel remaining gauge. It reads out the usable fuel in gallons (from 0 to 12.5 gallons). If I were you, I would get a bluetooth OBDII adapter and Torque and start monitoring this to see if you actually have a problem and, if so, what the problem really is, whether your tank capacity is diminished for some reason or the warning is not coming on at the appropriate time.

[Ozzman]

Have you ever had the fuel pump replaced or messed with? This sounds like the fuel pump may be failing to draw fuel from the other side of the saddle. Perhaps the crossover pipe is kinked or something along those lines.

[Packofcrows]

Originally Posted by Simisimi

I don't normally let my BRZ get down much below 1/4 tank but recently I was on the Interstate and not paying attention to the gauge when "beep" the fuel low indication came on. Withing one minute the car began to buck and loose power. A mile later I was on the side of the road calling AAA. They brought me the standard 2 gallons of 87 octane crap and off I went driving gently the 4 to 5 miles to the closest gas station. I filled the car - it took 9 gallons. I expected it to take about 11+ being a 13.x gallon tank. Since I have a 93 tune and turbo I really wanted as much premium fuel to mix into that 87 octane stuff as possible so I attempted to top it off. By 9.5 gallons the fuel was about to spill out the filler. OK so my math is that ZERO plus 2 plus 9.5 = 11.5. Also isn't the reserve supposed to be about 2 gallons?

dafuq?

Clog somewhere or something? I drive mine till it has around 3-4 gallons left and pump gas. I always pump 9-10 gallons. Reset ECU?

When you pump and it clicks saying its full, check how much more you can put in as 'overfill' but really slow so that if it starts clicking every 2-3 seconds you know it is full and dont spill fuel. I can always add 3/4 gallon or so even after it clicks off.

[extrashaky]

Originally Posted by Packofcrows

When you pump and it clicks saying its full, check how much more you can put in as 'overfill' but really slow so that if it starts clicking every 2-3 seconds you know it is full and dont spill fuel. I can always add 3/4 gallon or so even after it clicks off.

You're not supposed to do that. From page 76 of the manual:

● Stop filling the tank after the fuel nozzle automatically clicks off
● Do not top off the fuel tank

[billwot]

Originally Posted by Packofcrows

dafuq?

Clog somewhere or something? I drive mine till it has around 3-4 gallons left and pump gas. I always pump 9-10 gallons. Reset ECU?

When you pump and it clicks saying its full, check how much more you can put in as 'overfill' but really slow so that if it starts clicking every 2-3 seconds you know it is full and dont spill fuel. I can always add 3/4 gallon or so even after it clicks off.

Bad practice!!