05-19-2021, 03:51 AM
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#1
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Melted rear seat, what could cause this?
2001 4WD, One of the evap lines to the charcoal case got so hot that it disintegrated and then melted the seat above it.
A Toyota specialist here in Denver has never seen this in over 30 years and has no idea what caused it.
There was no wires involved.
Any ideas?
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2001 4Runner SR5, Tundra 13WL Brake Conversion, currently working on a full suspension upgrade..., Wish List: TRD Supercharger Kit and Sport Scoop Hood.
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05-19-2021, 08:06 AM
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#2
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Senior Member
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Well THATS a new one
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05-19-2021, 08:27 AM
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#3
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Quote:
Originally Posted by johnsoma73
Attachment 382134
2001 4WD, One of the evap lines to the charcoal case got so hot that it disintegrated and then melted the seat above it.
A Toyota specialist here in Denver has never seen this in over 30 years and has no idea what caused it.
There was no wires involved.
Any ideas?
Sent from my iPhone using Tapatalk
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When you fill up, do you stop when the pump stops? Or do you add a little extra, i.e. top off the tank? I believe topping off can put liquid gasoline into the charcoal canister. Activated carbon (charcoal) and hydrocarbon (gasoline) can react very exothermically (lots of heat generated). The charcoal canister should only see vapors. The liquid may have resulted in a more significant reaction.
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2001 4Runner SR5 4WD - 231 mm TBU, B&M 70264 external transmission cooler, Magnefine external transmission filter
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05-19-2021, 08:37 AM
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#4
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Somebody was getting hot and heavy in the back seat
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05-19-2021, 10:02 AM
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#5
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That fire retardent in the carpet and seat material did it's job.
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05-19-2021, 10:32 AM
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#6
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Evap lines carry no heat, at least not enough to ignite something.
Only place I've felt any 'heat' (more like warmth) is on passenger side around where the oem jack is stored. Has minimal insulation from exhaust pipe below, so I added more.
So this is on driver side, correct? I'll check that side soon but could be something else.
Once I was driving back from deer lease at highway speeds, looked in rear view mirror and saw small smoke trail. Pulled over and found a 6v feeder battery that managed to find a small piece of metal to arc across, it was starting to ignite a piece of plastic off corn bag, got lucky there.
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.
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05-19-2021, 04:44 PM
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#7
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Could you get a pic from underneath?
I've never seen the evap system get hot on any other car, including my '99 4Runner. It's under the hood on the 96-00, not under the seat next to the tank like on the 01-02. I'd just be concerned that something under there may have been damaged from the heat, as much as wondering how it got that hot. Somehow some gas fumes got ignited?
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05-19-2021, 07:01 PM
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#8
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Fuel pump wiring is suspect
The evap pipes aren't really under the seat, they're under the vehicle traveling mostly along the driver side left of middle, together mostly with the fuel lines.
The evap lines don't get more than 1/2" close to the body and in some places are 2" away (on my '01 anyway).
I just drove it about 40 miles, got underneath and touched evap lines, barely a few degrees warmer than my hands.
Perhaps the wiring on top of the fuel pump caused the issue? Where the burn marks are is just about where the pump is underneath the body and above the fuel tank, smack in the middle.
Regardless, very lucky it didn't go further. I'd have a pro check this out, probably have to drop the tank to find out for certain. I wouldn't drive it anymore either....
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2001 Limited 4WD - 346+K - SunfireRed\Thunder Cloud; - 265/75/16 Michelin A/T2s - Fat Pat's 1.5" BL - StopTech ANGLED rotors - In series 699 trans cooler, New Yota1 transmission, All new OEM suspension front to rear.
Last edited by jgue467; 05-19-2021 at 07:08 PM.
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05-19-2021, 07:09 PM
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#9
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That’s a very strange burn location for sure. When parking at home definitely avoid the garage until you figure this out.
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05-19-2021, 07:22 PM
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#10
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I'd be willing to bet you were actually on fire. That's more than just heat transfer.
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05-19-2021, 07:33 PM
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#11
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Wow, I've never seen that before, ever. Or anything close.
I agree with above sentiments, don't drive it until you know what's gone wrong. The fuel pump and fuel tank are very close to that burn mark but nothing even near that should EVER get that hot since it's right above 18.5 gallons of gasoline...
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05-19-2021, 08:12 PM
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#12
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Quote:
Originally Posted by gamefreakgc
Wow, I've never seen that before, ever. Or anything close.
I agree with above sentiments, don't drive it until you know what's gone wrong. The fuel pump and fuel tank are very close to that burn mark but nothing even near that should EVER get that hot since it's right above 18.5 gallons of gasoline...
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Came back to comment about checking the fuel pump myself, just had the realization on the way home it's directly under that spot or at least VERY close
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Y2K Highlander Millennium Silver 3.4L auto @ 320k and climbing
Toytecs + 5100s / 7.5 wrap + OME spacers + Tokicos / JBA UCAs / Anonymous Fab. LBJs / Total Chaos Gussets / EimKeith PCK + LCAR / Extended Bump Stops; Brake Lines; Rear Diff Breather / True North Fab. Hybrid Bumper / CBI Hybrid Bumper + Tire Carrier / 4xInnovations Hybrid Sliders / Opt Offroad Trailing Arms / Lil Skip Gas Skid / BudBuilt Front Skid / ARB Rear Locker
Last edited by Devbot; 05-19-2021 at 08:34 PM.
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05-19-2021, 08:24 PM
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#13
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Fuel will never ever get heat up to a point of burning stuff without getting lit by an source of ignition first. A electrical short could do that. Or someone who held a flame to the underside at that spot.
How does it look under the truck at that spot? Any pics?
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05-20-2021, 12:02 AM
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#14
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Wow! Spontaneous combustion...
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05-22-2021, 11:45 AM
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#15
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Isn't the electrical connector for the fuel tank right there?
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