This is the exact issue we had in Moab
Thoughts on Fuel Tank Capacity During a Long Drive...
- Thread starter FinallyGotOne!
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Yup, engineers can't ever trust buyers because they are always right, even when used in ways the manufacturer did not intend. Some cars are prone to charcoal canister fouling/failure from topping up though. Because of environmental concerns, wasting gas, potential for causing premature failure of the charcoal canister, I personally don't top off to try to overfill the tank. But I do check to see if the tank is actually full with a click after the auto stop because it does stop prematurely at times. If it takes much more gas, I might give it another click. If it stops quickly, it's full.
In the spirit of this thread, I do encourage innovative ideas to get more capacity. It's been known that some other manufacturers leave capacity on the table, or will have the same fundamental design but support more capacity with detail changes. Jeep in particular with the Wrangler. They actually upsold a 15 gallon for 19 gallons using the same tank, just with some plumbing and float changes -
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This is the video I mentioned above about gas boiling.
Markuson
SILVER Star
Must be secret Moab juju...because the ONLY place I ever experienced the bubbling fuel thing you describe was this Summer going up Top of the World. What's weird is/was...by the time it happened, I was nowhere even close to full...but sitting at a steep angle as I figured out how to get past an obstacle with the engine running.
Weird.
Taco2Cruiser
Crazy American Off Road
Yea, your example is of a YJ, the worst designed jeep ever conceived along with its vacuumed powered 4wd and first attempts of compute management.
I'm talking about modern, post '06 Toyota 4x4s. You can fill the neck to fuel pouring out of it, but there will still be air pockets at the front of the tank and just forward of the intel tube.
We are agreeing on the same end state, I'm just saying that I humbly disagree with how you got there, while I agree that's how it was done 20 years ago, it's not how things are designed today.
Taco2Cruiser
Crazy American Off Road
Gasoline expansion can be calculated with by this
Long story short the expansion of a 25 gallon tank from an increase of 50 degree F is about .2 gallons, so thinking that a couple inch below the surface is around 70 degree, then even at air temp of 120 that is still a very little amount, think of the fuel used to get from the gas station out into the trails.
For boiling point of gasoline varies pretty wide. It starts an intial at 95 degrees but doesn't complete until 395. Though the average of US pump gas 87 is safe to be above 200.
For gasoline to be boiling at that rate, and at only those summer tempurates (try Kuwait in summers, I mean damn, and I never had issues with OOOLLLLDDD ass vehicles there) with that fuel consumption. I would say that the fuel is compromised and has water in it.
Do you know what that truck was filled up with? From a station in Moab or from a jerry can?
thanks for the feedback. I filled mine up the morning of the trail run at the City Market in Moab and it did that exact same thing... The truck still ran fine, it appeared to affect nothing else.Gasoline expansion can be calculated with by this
Long story short the expansion of a 25 gallon tank from an increase of 50 degree F is about .2 gallons, so thinking that a couple inch below the surface is around 70 degree, then even at air temp of 120 that is still a very little amount, think of the fuel used to get from the gas station out into the trails.
For boiling point of gasoline varies pretty wide. It starts an intial at 95 degrees but doesn't complete until 395. Though the average of US pump gas 87 is safe to be above 200.
For gasoline to be boiling at that rate, and at only those summer tempurates (try Kuwait in summers, I mean damn, and I never had issues with OOOLLLLDDD ass vehicles there) with that fuel consumption. I would say that the fuel is compromised and has water in it.
Do you know what that truck was filled up with? From a station in Moab or from a jerry can?
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Was the gas physically hot? Could the fuel pump have been overheating for some reason?
LOL. That's worse than a 60 series. Sounds about on par with an FJ55.
My thought is that no Cruiser has come from the factory with a big enough fuel tank.
As I Understand it there is a larger main tank available for a Tundra. I could be wrong, but I think Dave Conners swapped his
Transfer Flow, Inc. - Aftermarket Fuel Tank Systems has tundra tanks. Apart from custom or Long Ranger, I don't know if a 200 solution.
That is a really good question - the vapor coming from that video was warm - I didn't touch it.
On the 100 I did use Dynamat insulation on the sides that was close to the exhaust. I also wrapped the exhaust near the gas tank with header/exhaust wrap.
Today I ran my tank down to the point the trip computer literally said my range was 0 miles (low fuel light had been on for a long time), but when I filled up (including topping off just to see how much I could get in there) I only managed to fill 19.2 gallons. Combined with the mpgs I've been getting lately in stop and go city traffic with winter blend fuel in freezing temps, my fuel range is pretty dismal. Any ideas why I can't get more than 19 gallons in the tank even though my range is zero? Does it have something to do with really low ambient temps?
Markuson
SILVER Star
Normal. Once it says you have 0 miles, you still have somewhere between 4 and 5 gallons left.
It's annoying. It's like Toyota doesn't trust you with the real range limit...
-Sorta like someone sneaking in and changing all your clocks to 5 minutes early...because they want you to be on time.
Toyota knows its customers. When my Explorer or any of my previous German cars said they were empty they were damn close to it. I've had to help out so many family and friends who never planned ahead or were used to Toyota fuel ranges
In these freezing temps my wife's GS350 said it was 0 miles range for about 10-20 miles and then when I filled up 17 gallons in the 17.2 gallon tank I was pretty shocked. It was probably doing much worse mpg to be in such a dire need of petrol. I guess it's better Toyota's way.
My german car gauges work like real gauges. You don't have to do any second guessing as to what it's telling you. It works linearly and accurately. On the japanese cars I've owned, the gauge is very optimistic in the top half, and will drop like anchor in its bottom half. It's been said this gives the illusion of fuel efficiency.
It's taken some getting use to, to second guess what the LX570 fuel gauge and range meter are tell me. I don't like it as I prefer to optimize and use the full capacity of the tank through my own interpretation of fuel level and range.
I can certainly understand why Toyota does this however. The left over range can sway dramatically based on driving conditions. With a mpg rating of 13 city, 18 hwy, consider that with 4 gallons, this represents a pretty wide range of 52 - 72 miles. With towing, or running in sand for example, it could be shorter than 52 miles. Then consider that there might be steep grades when off roading, and what is truly accessible by the fuel pump, may be much shorter still. German cars don't have to reliably deal with these mixed conditions.
It's taken some getting use to, to second guess what the LX570 fuel gauge and range meter are tell me. I don't like it as I prefer to optimize and use the full capacity of the tank through my own interpretation of fuel level and range.
I can certainly understand why Toyota does this however. The left over range can sway dramatically based on driving conditions. With a mpg rating of 13 city, 18 hwy, consider that with 4 gallons, this represents a pretty wide range of 52 - 72 miles. With towing, or running in sand for example, it could be shorter than 52 miles. Then consider that there might be steep grades when off roading, and what is truly accessible by the fuel pump, may be much shorter still. German cars don't have to reliably deal with these mixed conditions.
