Has this happened to anyone else? Fuel pressure

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socalmtbiker

socalmtbiker

Joined
May 1, 2016
Threads
27
Messages
433
Location
san diego
2005 lx470 86000+miles

The rig is still new to me. Just a little over a month old. I've taken it around but not any serious 4x till now. I had a few minor problems which where all fixed put over a 1,000 easy miles and did some towing with no issues. We made the trek from San Diego to Bishop, Ca then I decided to take on Silver canyon the same day we drove up. I topped the tank off and headed up.

The climb was long and steep. I was on 4 low mostly and taking my time. I smelled a little gas and just thought I was burning rich. I had no mechanical problems with the drive so I kept going till I hit the top. No check engine light. I get out to do check the rig and found fuel had been spitting out of my gas cap because of the pressure. Never seen this before. I just a search and said it may be the charcoal cannister, clogged lines, or a few valves not working. Has this happened to anyone else?

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Yep happened to me last weekend. I didn't neccasarrily top off I had 3/4+ of a tank and it did it to me. No check engine everything was A ok....04 lx w/ 110k. Built up a lot of pressure in the tank. Was figuring a seal was bad
 
There are other threads on this problem, as you probably found. In those threads, one thing that comes up often is the damage the can be done (flooding) to the charcoal canister by topping off the tank after the auto-shut off. When the canister is flooded with gas it can't operate properly and pressure can build up, forcing gas out the cap. This seems to happen more often in hot weather and when going to higher altitudes from lower altitudes. If you put in more gas after the shut-off and then ran in hot weather up Silver Canyon, I'd look there first. Especially if the truck has been running ok otherwise.
 
Dzrtcrzr said:
Yep happened to me last weekend. I didn't neccasarrily top off I had 3/4+ of a tank and it did it to me. No check engine everything was A ok....04 lx w/ 110k. Built up a lot of pressure in the tank. Was figuring a seal was bad
Click to expand...
Did you drive off road again and did it happen again?

I'm tempted to drive up again with less fuel to see if I'll get the same symptoms.
 
This is kind of common on these trucks unfortunately! They do not like hight altitude + hot weather + FULL tank! During Hundreds In The Hills we try to warn everyone to keep around half tank instead of fill up to the top to minimize the issue! I had it last year on my way to HIHs about 50 miles to get there then again on my way back just outside Grand Canyon. Riding 70-75, full tank, hot, high altitude. At the moment all you can do is crack the cap and vent the tank, sit for a little wile and wait for everything to cool down a bit. I sat at the entrance to Grand Canyon for 45 min then it was fine, I could hear the boiling sound inside the pipe!
 
socalmtbiker said:
Did you drive off road again and did it happen again?

I'm tempted to drive up again with less fuel to see if I'll get the same symptoms.
Click to expand...
It didn't happen to me again that weekend. But then again there was less gas in there (1/3 of a tank) the next day and was a bit cooler. We were in exact same conditions as you. Long steep pass, hot,. When I realized what was going on we were stopping to camp. So what @getoutside says makes complete sense now.
 
Sandroad said:
There are other threads on this problem, as you probably found. In those threads, one thing that comes up often is the damage the can be done (flooding) to the charcoal canister by topping off the tank after the auto-shut off. When the canister is flooded with gas it can't operate properly and pressure can build up, forcing gas out the cap. This seems to happen more often in hot weather and when going to higher altitudes from lower altitudes. If you put in more gas after the shut-off and then ran in hot weather up Silver Canyon, I'd look there first. Especially if the truck has been running ok otherwise.
Click to expand...

Do you know how I can check if the CC is flooded? I searched charcoal cannister under 100series but not much for results. Thanks
 
Get outside said:
This is kind of common on these trucks unfortunately! They do not like hight altitude + hot weather + FULL tank! During Hundreds In The Hills we try to warn everyone to keep around half tank instead of fill up to the top to minimize the issue! I had it last year on my way to HIHs about 50 miles to get there then again on my way back just outside Grand Canyon. Riding 70-75, full tank, hot, high altitude. At the moment all you can do is crack the cap and vent the tank, sit for a little wile and wait for everything to cool down a bit. I sat at the entrance to Grand Canyon for 45 min then it was fine, I could hear the boiling sound inside the pipe!
Click to expand...

Interesting. So there's a possibility that the I have no issue with the charcoal canister and that the issue is contained to a full tank and heat expansion? I just asked another member but do you know how to check if the charcoal canister is flooded? Thanks
 
Well, theres a chance the canister is fine but the chances of it being flooded are also high! I guess it would depend of how much gas you had on the trail and the degree of the steep inclines you took! I do not know how to make sure of damage or not, guess I need to figure that out as well!
 
FWIW, I just had this same issue with my 2007 with boiling fuel, alotta tank pressure and heavy gas smell in the cabin.
One thing to note, boiling will increase as pressure is released from the tank, so be careful bleeding off the excess pressure if it happens to you.
After researching this site, I had a mechanic blow some air (about 40 psi) into the intake fitting on the canister, and that worked, cleared it right out.
For about a day.
Getting creative, I thought I'd try it myself after seeing how easy it looked when a skilled professional did it.
So I winged it with a scuba tank...
Total failure.
Canister was seized up tight, and at 330k km, who can blame it for giving up the ghost?
So I went to reinstall it, procrastinating the real repair in true American fashion, and promptly dropped the thing and broke the housing.
I can now bear witness that these things are in fact filled with gas-soaked charcoal.
Had no choice but to try and run without it, and run it did, started right up, but the gas smell was quite profound without all that charcoal emissions mumbo-jumbo in the way.
A few days ago I replaced the thing, and while I was at it, gave it a new fuel and air filter.
Solved other problems now that the truck could breathe, sluggish acceleration, failure to downshift all gone, along with the gas smell and boiling fuel.
Had to order the tubes fitted onto the intake and output, still not here but clearly the old ones are dry-rotted.

Lessons learned:
Don't top off the tank...causes raw gas rather than fumes to soak the charcoal
A scuba tank is (almost always) not a repair tool
If it's broke, fix it, or at least don't break it worse
 
IIRC, the series 100 had the Charcoal Canister moved to the rear from the engine compartment in 2003. Has anyone in a pre 2003 experienced this issue?
 
^My friend's 1999 LX had the same thing happen across the valley from where the OP's happened, at about 9k feet on a hot day. Very full gas tank. You could hear the boiling in the engine compartment.
 
@2001LC: yes, fuel came out of the gas cap. It looked exactly like the OP's first pic.
 
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