DANGEROUS GAS PRESSURE BUILD UP IN GAS TANK!
Why?
What's going on?
How can we fix this?
Edited 12/29/23: It is a unban myth, all Land Cruisers boil fuel. They do not!
Edited 7/4/20: What I found in every case of "fuel boiling" I've worked on. Was, engine overheating or running hot. That once the issue of coolant system and engine brought back to factory spec. That the Charcoal canister then needs replacing in most 03-07 and some 98-02.
Please report your ECT (engine coolant temp) here. The info, will be very valuable. Whether having this issue of fuel boiling or not. Other data points in order, I feel of most value; Long term Fuel trims (LT FT), Engine RPM, MPH, CAT Temps.
So I'm working on a 99LC w/210K miles. A nice clean rig that's been garage kept and well maintained. Or so it seem, by history and at first glance. Owner Gavin, was referred to me. He's been having the issue for ~4 years and it's getting worst. He had a number of local shop work on it, and a few tried to solve this issue. Charcoal canister was replace with a used one from salvage yard. The used CC may not have be a good option. As it could be contaminated.
Gavin reported to me his fuel tank fill cap, when removed, Will have fumes blowing out continuously under pressure as cap removed. The sound and smell of gas vapor will go on for an extended period of time. Not just the normal short hiss. Also, fuel smell, is filling cabin at times while driving. At times, gasoline smell comes from under the hood. This is worst on hot days, especially when driving in mountains of Colorado. But will also happen just driving around Denver, just to lesser extent and less often.
I've read about fuel tank pressure issues in mud for years now. In some cases the off road guys here in CO, have had fuel coming out tank at gas fill cap area. Reports of cap flying 20 feet through the air as it's removed. Some pictures around, where one can see the fumes coming for fuel fill area. One reported (pictures in mud) of a fire at gas tank.
Seems the off road group have found a few things that help here:
1) Only fill fuel tank 3/4 full.
2) Not using gas with ethanol.
3) Installing heat shield between exhaust and gas lines.
This is first one I've had to work on with this issue. I did not witness issues, so only going on what Gavin explained to me.
I've had my doubts, what is cause this being, heat from normal exhaust temperatures. Whereas I'm not saying 1), 2) and 3) above, aren't a benefit. But why isn't, every land cruiser having these issues. Why aren't more pictures of fuel running down body at gas cap. Why has this not been addressed by Toyota. If this is a design fault, they'd have a liability if not addressed by now, or did Toyota address? The issue could be deadly. Fumes of gasoline are deadly alone, and highly flammable.
So what is your thoughts on cause or causes?
What has worked?
Is one issue or many that need addressing?
Thoughts?
"Edit 12-29-23:
Once we either over-fill fuel tank or boil fuel within. We dump raw fuel into Charcoal Canister (CC). In models where CC in rear near gas tank. As in the 03-07 100 series. This happens easily. The CC in engine compartment of 98-02 100 series are more forgiving, but can also be flooded.
Once a Charcoal Canister flooded, it must be replaced!
I've found, after all done to correct boil. Be it, correcting hot running engine, hot transmission fluid, shielding excessive radiant heat, we stop over filling gas tank, fault in EVAP system or any combination. We'll often still get fumes (AKA venting). Often the fumes smell, is putrid. Like old gas, that has gone bad sitting in that lawn mower for years. That is the smell of a contaminated CC, that has been contaminated for some time. Which is surely clogged and must be replace.
These CC when removed, are noticeable heaver than new. That's due to raw fuel it has soaked up, contaminating them.
If CC clogged, the fuel tank builds excessive pressure.
We must corrected reason the CC was contaminated in the first place, before replace CC. Or we risk damaging CC again."
I'll post some threads on issue here:
Why?
What's going on?
How can we fix this?
Edited 12/29/23: It is a unban myth, all Land Cruisers boil fuel. They do not!
Edited 7/4/20: What I found in every case of "fuel boiling" I've worked on. Was, engine overheating or running hot. That once the issue of coolant system and engine brought back to factory spec. That the Charcoal canister then needs replacing in most 03-07 and some 98-02.
Please report your ECT (engine coolant temp) here. The info, will be very valuable. Whether having this issue of fuel boiling or not. Other data points in order, I feel of most value; Long term Fuel trims (LT FT), Engine RPM, MPH, CAT Temps.
So I'm working on a 99LC w/210K miles. A nice clean rig that's been garage kept and well maintained. Or so it seem, by history and at first glance. Owner Gavin, was referred to me. He's been having the issue for ~4 years and it's getting worst. He had a number of local shop work on it, and a few tried to solve this issue. Charcoal canister was replace with a used one from salvage yard. The used CC may not have be a good option. As it could be contaminated.
Gavin reported to me his fuel tank fill cap, when removed, Will have fumes blowing out continuously under pressure as cap removed. The sound and smell of gas vapor will go on for an extended period of time. Not just the normal short hiss. Also, fuel smell, is filling cabin at times while driving. At times, gasoline smell comes from under the hood. This is worst on hot days, especially when driving in mountains of Colorado. But will also happen just driving around Denver, just to lesser extent and less often.
I've read about fuel tank pressure issues in mud for years now. In some cases the off road guys here in CO, have had fuel coming out tank at gas fill cap area. Reports of cap flying 20 feet through the air as it's removed. Some pictures around, where one can see the fumes coming for fuel fill area. One reported (pictures in mud) of a fire at gas tank.
Seems the off road group have found a few things that help here:
1) Only fill fuel tank 3/4 full.
2) Not using gas with ethanol.
3) Installing heat shield between exhaust and gas lines.
This is first one I've had to work on with this issue. I did not witness issues, so only going on what Gavin explained to me.
I've had my doubts, what is cause this being, heat from normal exhaust temperatures. Whereas I'm not saying 1), 2) and 3) above, aren't a benefit. But why isn't, every land cruiser having these issues. Why aren't more pictures of fuel running down body at gas cap. Why has this not been addressed by Toyota. If this is a design fault, they'd have a liability if not addressed by now, or did Toyota address? The issue could be deadly. Fumes of gasoline are deadly alone, and highly flammable.
So what is your thoughts on cause or causes?
What has worked?
Is one issue or many that need addressing?
Thoughts?
"Edit 12-29-23:
Once we either over-fill fuel tank or boil fuel within. We dump raw fuel into Charcoal Canister (CC). In models where CC in rear near gas tank. As in the 03-07 100 series. This happens easily. The CC in engine compartment of 98-02 100 series are more forgiving, but can also be flooded.
Once a Charcoal Canister flooded, it must be replaced!
I've found, after all done to correct boil. Be it, correcting hot running engine, hot transmission fluid, shielding excessive radiant heat, we stop over filling gas tank, fault in EVAP system or any combination. We'll often still get fumes (AKA venting). Often the fumes smell, is putrid. Like old gas, that has gone bad sitting in that lawn mower for years. That is the smell of a contaminated CC, that has been contaminated for some time. Which is surely clogged and must be replace.
These CC when removed, are noticeable heaver than new. That's due to raw fuel it has soaked up, contaminating them.
If CC clogged, the fuel tank builds excessive pressure.
We must corrected reason the CC was contaminated in the first place, before replace CC. Or we risk damaging CC again."
I'll post some threads on issue here:
100 Caught fire & gas tank venting concerns
I just took a couple of hours to read through this thread. I have experienced this issue in both of my LC100s. On the lower milage one (135k), it happens semi-frequently. It happens at high elevations, rolling trails at low speeds, and highway speeds on hot days. It has even happened at sea...
forum.ih8mud.com
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