It has to be positive pressure. I think the vent line is completely closed probably in the canister. This causes fuel to be pushed out of the tank through the return line from its tube in the bottom of the tank to the canister. Let the gas tank pressurize up and disconnect the tank vent line at t…

The new exhaust does not have necessary heat shields, and is heating the fuel. The evap sys can’t keep up, and is now ruined. It is likley to ruin the tank, i.e. melt or burn a hole in it. Problem is extremely dangerous.

Listening to the “answer” provided to Betsy brought back to me Andy R.'s immortal words: “the intricacies, the gives and takes, the wherefores and why-nots, can become a veritable pas-de-deux of breathtaking speculation, interwoven in such a way that apologies or gestures of doubt are rendered unne…

All of the above comments about the canister are good and should be checked. There is another possibility; it was never said weither the vehicle was carburated or fuel injected. On the outside chance that it’s fuel injected,. most high pressure and electric fuel pumps have a return line that goes …

The gas cap has a one way vent valve which is to relieve VACUUM. This is to prevent tank collapse if there is a vacuum in the tank. Relieving PRESSURE at the cap would completely negate the entire purpose of the EVAP control system. Positive pressure is relieved through the purge valve in the cha…

Re. “mud chiggers:” I found no such thing in a Google search. I question the existence of “mud chiggers,” never mind how they might get into a fuel line.

I have a feeling “mud chiggers” and “snipe hunting” are one in the same.

Could it be that the cannister is just full of fuel from overfilling (or exhaust heating as previously suggested) and therefore not working as expected to vent fuel? I can’t imagine how fuel would leak from the cannister unless it’s full of fuel, vs. just capturing the vapor it’s designed to captur…

I believe that she said there was pressure coming out of the tank. I think the boys mentioned the canister. She was not specific about exactly where the fuel was leaking. I think the clue was in the exhaust being replaced and her moving to New Orleans. If the exhaust is missing heat shields or w…

I think this was a mid-90’s Toyota pickup, right? I had a Toyota pickup once and it had fuel starvation issues at freeway speeds. It ran fine otherwise, but would often have a fuel smell. Turns out the lines on the fuel pump had been reversed by a previous repair job. If I recall correctly it was th…

Leaking fuel at evaporative canister

The Show

djones223 January 14, 2012, 10:48pm 2

I wonder if the leaking exhaust system is heating the fuel tank causing the gasoline to boil and get into the evaporative canister. I’ve seen this many years ago working at a gas station. The can drove from the interstate and I heard a rumbling from the rear of the car and when I opened the gas cap it vented hot fumes! The exhaust pipe was leaking directly onto the gas tank.

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Leaking fuel at evaporative canister

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