I am having that intermittent gas smell inside the cabin for two weeks now.

It happens when I get out of highways and the truck comes quickly to a stop. I also have it almost everytime when I turn off the engine. The smell dissipates pretty quickly, but I certainly take it very seriously.

I checked when the truck is (obviously) parked, I applied throttle and whenever I can smell gas, it comes from under the hood on the passenger side behind the battery.

The fan may be misleading me because of the air flow, but I am quite sure it's there.

I checked everywhere on the fuel lign for apparent leaks. I checked the dampener, regulator, fuel filter, cold start inctor lign, hoses and fittings. I also changed my injectors seals. I even tried the car without the charcoal canister and its hoses blocked off.

Last thing I did yesterday is put dye in my fuel and inspect everywhere with UV lamp. I checked all the way to the fuel tank.

Nothing....

Appart from that smell, the truck runs pretty well

 

My dampener leaked intermittently. I almost wouldn’t have noticed except i saw it drip out of the corner of my eye. It happened after shutting the engine off. Recheck your dampener.

 

I have been checking the dampener over and over again for the last days. When I first got a look at it in the beginning and removed the plastic cap, I noticed that the screw had fallen. There was no fuel or fuel scent near the dampener or in the cap. I read about the screw and it seems that it would not be related to any leak whatsoever.
I wish I would be so lucky as to see a drop somewhere....
Was your dampener leaking from the screw hole or from around it?

 

"Damper."

The screw is just a pressure indicator (it sticks out further when the rail is pressurized. It fits into a rubber diaphragm. Air on the screw side of the diaphragm, fuel on the other side. The damper leaks when the rubber gives way; the presence of the screw has nothing to do with it. So don't bother replacing (or tightening) the screw.

 

I'm told sometimes the gasket on the top of the fuel tank can develop leaks. Easy to inspect by just removing the plate under the rear bed area below where the rear seats would mount. You could also have some tired hoses that are cracked in that same area that have gone unnoticed.

 

Yeah, I remember you correcting other people.
But if it’s leaking, it rightly could be referred to as a dampener. 😁

 

My 4runner is actually a small Winnebago that Toyota used to make in the mid and late 80's. Getting on top of my fuel tank is not easy....
I have already inspected all my rubber hoses. I may be changing them just to make sure.

 

But if the problem is near my fuel tank, would it be smelling in the engine compartment and through the ventilation system?

 

the aftermarket dampers do away with the screw and the plastic bottom cover. i had to install one in each of my '87 4runners shortly after purchasing them (one in 2013, the other in 2018). the replacement dampers have been just fine since installation.

 

RockAuto shows two aftermarket dampers, one with, and one without, the screw.

Just as well. Hardly anyone knows the purpose of the screw so it just causes confusion and little benefit.

 

could be. i don’t do rock auto, though.