Gassy Pig?

[PabloCruise]

Vented gas caps are also fairly cheap. I got a Stant one for my old 40 and it worked well.
NAPA one:703-1034
STANT Part # 10646 {Regular Fuel Cap - 2 3/16" Vented Anti-Surge (1 3/8" x 1 1/4" Shallow Cam) #11646}

I guess I am hesitant to go here, as I do not want gas vapors back by the cap if I can avoid it. I am a little neurotic about certain things - any smell of anti-freeze freaks me out, I do not like smelling raw gas anywhere around a vehicle that is not fueling, and leaks - I H8 leaks!

 

[davegonz]

LOL! That's why I wanted a diesel in my pig. Driving a 2F is stinky! You're 3FE should be pretty stink-free.

 

[tucker74]

I didn't do any fancy sizing, I just happened to have the can from the 62 my 3FE came out of ... it's probably 1.5-2x larger than the OEM 40 can. Its a gas, it will find the path of least resistance under pressure, I figured outside was better than inside

Tucker

 

[PabloCruise]

I didn't do any fancy sizing, I just happened to have the can from the 62 my 3FE came out of ... it's probably 1.5-2x larger than the OEM 40 can. Its a gas, it will find the path of least resistance under pressure, I figured outside was better than inside

Tucker

Valid thoughts. I think I will see how much back pressure exists right now at the charcoal canister. If there is a lot, that could be why the check valve split at the vapor separator.

 

[PabloCruise]

I was having issues with excess pressure building in the tank due to the amount of fuel cycling back to the tank through the return. I had perfect fuel pressure to the injectors, but my stock vapor recovery could not keep up. I put a pin hole in my fuel cap to make it "vented" until I could install a larger canister from a 62.

Tucker

Thinking on this some more, can capacity would only mean you would smell vapors under the bottom of the can if it were not big enough to keep up with the vapors. If you had excess pressure in the tank, wouldn't that mean that the can was somehow plugged so the vapors could not move into the can? I wonder if there is a check valve in the can that was stuck, or if the charcoal matrix was clogged?

 

[PabloCruise]

Linking over to the thread on fuel fill hose in case anyone else comes looking for info on how to make their Pig less stinky in the future:

https://forum.ih8mud.com/threads/fuel-inlet-hose.849299/

 

[PabloCruise]

I have been working on swapping out the tank since mid-July

Yet it was not until yesterday that I saw this on my old tank.

I guess that might do it!

Wonder why it would develop a crack there?!?

 

[PabloCruise]

I was having issues with excess pressure building in the tank due to the amount of fuel cycling back to the tank through the return. I had perfect fuel pressure to the injectors, but my stock vapor recovery could not keep up. I put a pin hole in my fuel cap to make it "vented" until I could install a larger canister from a 62.

Tucker

Before I starting putting in the new tank, I tested the vapor return line from the vapor separator w/ 15 PSI air - it took it no problem for what seemed like a long time (several minutes).

 

[PabloCruise]

I have been working on swapping out the tank since mid-July

Yet it was not until yesterday that I saw this on my old tank.

I guess that might do it!

Wonder why it would develop a crack there?!?

View attachment 1133757

It sounds like this happens somewhat regularly...

Why did Toyota engineers hate Pigs?

Exactly like that. With a full tank, it allowed gas to drain into the depression on top of the tank and made for great smells. I'd had it repaired when I had the tank cleaned while building the Pig 5 years ago but it reappeared. I'm told it's a common failure due to stress as the tank is mounted solidly to the frame without any bushings to allow give. Luckily found a good tank which cleaned up nicely and pressure tested ok.

 

[Toyo_Judson]

Why did Toyota engineers hate Pigs?

I don't think they H8'd Pigs, they just designed them with "Easter Eggs" before it was cool and the chic thing to do at the time were puzzles like these... Ok, maybe they do H8 Pigs... if we get all Occam's Razor and stuff...