Why my 1991 toyota pick up truck has a gas leaking from black hose located on bottom of the charcol canister... is it that normal?

Try changing your fuel filter and add injector cleaner to your gas tank

P0442 and P0456 are both evaporative emission error codes due to a small leak. The most common cause is a leaking gas cap or hose leak on that system. I did not list a code for your 0513. I am sending you a little information about your problem.. Best of Luck to you..


2003 Lexus RX300 3.0L 2003 Toyota Sienna 3.0L 2003 Toyota Highlander 3.0L, Eng Cfg V6, Eng Des 1MZFE, USA/Canada 2004 Toyota Avalon XL 3.0L
Check engine light is on with trouble codes P0442 and P0456. The codes are evaporative system small leak codes.
1. Verify that the gas cap is a factory Toyota gas cap and visually inspect that all hoses and lines are tight and connected.

2. Locate the canister closed solenoid and the vacuum switching valve on the canister. Manually ground them and verify that they operate and function. The canister closed solenoid is normally open and should close when grounded. The vacuum switching valve on the canister is normally closed and needs to open when grounded.

3. Verify that the hoses are not loose or pulled off the canister closed valve on the air cleaner housing. This has been a common problem on some models.

4. If no problem is found, the next step is to ground the canister closed solenoid and the vacuum switching valve under the vehicle and simulate an evaporative test and verify that the system holds a vacuum and functions normally. When the solenoids are grounded, back probe the Blue/Black (L/B) wire on the pressure sensor, and with no vacuum or pressure, the voltage should read around 3.3 volts. Start up the vehicle and turn on the purge vacuum switching valve and use engine vacuum to draw down the system to around 2 volts on the pressure sensor. If the voltage does not increase rapidly, there is no problem. If the voltage increases quickly, look for the leak in the evaporative system. Potential Causes: Canister Closed Valve
Disconnected Canister Closed Valve (CCV) Hose
Gas Cap
Harness
Vacuum Switching Valve - For the pressure sensor.

What was the code number?

One of the most common evap issue with GM trucks is a cigarette pack sized Evap Vent Solenoid located near the rear of the gas tank. Code P044x. It's there to depressurize the gas tank and check for leaks.

The EPA says that fuel is no longer allowed to evaporate into the air so it seals off the fuel system. The vent valve opens so gas and fumes don't blow in your face when you open the gas cap. If it don't release the pressure it throws a code and if it don't close and allow pressure to build while driving it throws another code.

Start checking there for bad or disconnected hoses and wiring. Part itself is about $40 and easy to replace. It's location allows road dirt, dust and grime to get into the valve and jam the solenoid.

if the car will not take gas at the pump and spills out when trying check the hose that goes from filler tube to the charcole canister it will be full of charcole if so replace canister

No the evap canister is on the wheel well or the side of the tank. It is a charcole filled canister that handles the evaporation of gas coming through the hoses off the tank. your smelling gas from somewhere else. You need to replace the evap canister.

on the side of the motor.

That vacuum line goes to the purge control solenoid valve. I believe it will be located on either the firewall or on fender near canister

Hope that may have helped,
Tom

Check the fuel cap gasket to be sure it is not torn or worn. After that check the vent hoses that run from the fuel tank to the charcole canister located somonwhere under the hood. Is the smell stronger under the hood or toward the rear of the car? If you cannot find the problem, a fuel leak is dangerous and should be attended to ASAp by somone that has the experience to repair the problem
Good Luck

Oh yes there is and there is a charcol canister up under the hood that captures the vapors if the canister is full you could smell fuel.
You will need a shop that has a SMOKE MACHINE to find the leak in the evaporative emissions plumbing from the tank to the engine compartment.

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check for charcoal canister or evap canister full of gas