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Have I been hurting my 4-Runner???

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Have I been hurting my 4-Runner???

Old 05-17-2020, 11:34 AM
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Yep, replace gas cap and proceed onward stopping at one click

I, too, have a 4.7L 2UZ 4Runner. Same running gear that was used in the Land Cruiser. Engine is absolutely bullet proof...it was designed to be a truck engine and the way it's built proves it. Absolute BEAST of an engine, one of the best V8s ever made. Driving it and then driving something like a Ford Triton or GM 5.3...its just laughable how much more refined the Toyota engine is.

Old 05-17-2020, 12:48 PM
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Originally Posted by JKBrad View Post
Like all of the comments above, it's bad for your vehicle. When the charcoal fume filter is wet, the tank can breath as it's being emptied, puts a strain on the fuel pump and the vapors have nowhere to go. Continually doing this over time will break down the charcoal filter making the tank hard to fill as the pump will continually click off due to the vapors backing up in the tank. Eventually the vehicle will quit running and will need a new evap system and fuel pump. Before that happens the car will smell like gas all the time.


OK, now I'm worried. I noticed a gas smell on and off some weeks ago, thought it was just from my overfilling. Son ran it up to store a week ago and on his return mentioned a gas smell.

Crap..... Will this fix itself if I stop overfilling?
Or..

Should I change the charcoal canister now?

Ordered new OME gas cap today, here in a few days.
Old 05-17-2020, 01:27 PM
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The newer fuel systems also like your tank to be 1/2 full or better all the time.
Otherwise you will be replacing the fuel pump more often. The fuel cools it.

Old 05-17-2020, 02:10 PM
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Originally Posted by spraynet 1 View Post
OK, now I'm worried. I noticed a gas smell on and off some weeks ago, thought it was just from my overfilling. Son ran it up to store a week ago and on his return mentioned a gas smell.

Crap..... Will this fix itself if I stop overfilling?
Or..

Should I change the charcoal canister now?

Ordered new OME gas cap today, here in a few days.
My post should have said the tank can’t breathe. I fixed the original. Anyway, if there’s a constant gas smell, your carbon canister is more than likely shot. Replace it and the fuel cap. Disconnect your battery for a few hours and the codes will probably go away. Your fuel pump will thank you.

Last edited by JKBrad; 05-17-2020 at 08:52 PM.
Old 05-17-2020, 07:38 PM
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Lesson being learned.

Now on to "you-tube" to find the charcoal canister!
Old 05-17-2020, 08:01 PM
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I am not understanding how the fuel pump can be affected by the canister being plugged or needing 1/2 tank or more to cool the pump.
the fuel running thru it will cool it, if it is not pumping liquid I can see how that would be a problem.

OP why not have the codes read at auto parts store or shop and find out why the light is on?
Old 05-17-2020, 08:03 PM
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If you've never changed the gas cap, I'd try that first. Get a Toyota gas cap (NOT from autozone/advance auto) and have the codes reset.

I've replaced two Toyota brand caps, and tried an autozone cap once--it last about a week.
Old 05-17-2020, 08:04 PM
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Originally Posted by REMfish7 View Post
You don’t miss a thing do you scoop?
You've been making THT great for almost 3 years.
Old 05-17-2020, 08:17 PM
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Originally Posted by Joe View Post
You've been making THT great for almost 3 years.
Actually, I’ve been here since 2003. Forgot password after a break and wanted to sell a boat, so new user name and money.

You have anything else or do you feel stupid enough?
Old 05-17-2020, 08:19 PM
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Originally Posted by REMfish7 View Post
Actually, I’ve been here since 2003. Forgot password after a break and wanted to sell a boat, so new user name and money.

You have anything else or do you feel stupid enough?

Sure..whatever you say.
Old 05-17-2020, 08:42 PM
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Originally Posted by Joe View Post
Sure..whatever you say.
You are correct. It is whatever I say. Doesn’t excuse the fact that people in front of you stated the obvious.
Old 05-18-2020, 05:17 AM
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Originally Posted by 99yam40 View Post
I am not understanding how the fuel pump can be affected by the canister being plugged or needing 1/2 tank or more to cool the pump.
the fuel running thru it will cool it, if it is not pumping liquid I can see how that would be a problem.

OP why not have the codes read at auto parts store or shop and find out why the light is on?
The armature and case are not cooled by fuel internally.
Old 05-18-2020, 05:30 AM
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Most fuel pumps I have seen, the fuel runs right through them. As long as you don't run out of gas, pump stays cool..

Also, when on a road trip, nothing wrong with topping up the tank past the first click. You are going to be burning the fuel right away so no chance of liquid fuel backing into the charcoal canister.

If you fill your tank and then go park it in a hot parking lot, then you could have a problem as the tank heats up and no fuel is being burned. In that case do not go past the first click.
Old 05-18-2020, 06:04 AM
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It's the constant clicking until fuel is up in the filler neck that causes the most issues the quickest. Fuel runs down the vent tube and soaks the charcoal. As far as working the fuel pump harder, when vacuum builds in the fuel tank, the pump must work harder to draw the fuel since the tank can no longer vent. Eventually the idle gets bad, it begins to stall and run poorly before finally not starting at all unless it sits for several hours and the vacuum slowly bleeds off. Then when it does start, it won't run for long.

As far as keeping fuel in the tank to prolong fuel pump life. The pickup for the fuel pump is on the float. As the tank empties, the pick up gets closer to the sediment and water that slowly builds in the bottom of the tank. Running the tank low regularly causes some of this crud to run through the fuel pump each time you get near empty. A good rule of thumb is to try to top off before you get below a quarter of a tank.
Old 05-18-2020, 06:50 AM
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Originally Posted by REMfish7 View Post
You are correct. It is whatever I say. Doesn’t excuse the fact that people in front of you stated the obvious.
..just..lol
Old 05-18-2020, 06:54 AM
  #56  
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Originally Posted by NCSUboater View Post
Yep, replace gas cap and proceed onward stopping at one click

I, too, have a 4.7L 2UZ 4Runner. Same running gear that was used in the Land Cruiser. Engine is absolutely bullet proof...it was designed to be a truck engine and the way it's built proves it. Absolute BEAST of an engine, one of the best V8s ever made. Driving it and then driving something like a Ford Triton or GM 5.3...its just laughable how much more refined the Toyota engine is.
The only issue with them are the exhaust manifolds. The top 2 cats are welded to the manifolds, and over time, that union weld to the cats will crack. Same on the Tundra of that vintage. The OEM manifolds are about $2500; aftermarket are about $700. Headers are the best solution, with bungs welded in for the o2 sensors. I had a '05 2wd version that was fixed under warranty; Toyota service director dude told me that it would have been a $4K job at the time ('08 or so).

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