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Fuel leak from fuel evaporator

Leaks when bike is running and tank is on. turn tank off, it stops

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  • adam bikedoc May 03, 2015

    Do you mean the carburettor ?

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1 Answer

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  • Master
  • 1,554 Answers

Remove it or replace it

Posted on May 04, 2015

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Gas leaking heavily from overflow tubes.

Sounds like the float is sticking open on the carb and its draining. You can try taking the carb off and opening the bottom up and checking for anything that may be creating resistance.

Posted on Feb 01, 2009

goofduck
  • 490 Answers

SOURCE: 1998/99 kx 125 fuel leaking from carb outlet at bottom

sounds like the needle and seat may be the problem

Posted on Apr 15, 2009

  • 1 Answer

SOURCE: Rear fuel line at the tank is leaking

The connection is a quick dissconnect, I unpluged the line by pushing up on the bottom of the fitting and pulling down on the retainer . This allowed me to unplug the line. I then removed the fitting that was threaded into the tank and found the rubber "O" ring was bad, I replaced the "O" ring and put the parts back together. ( i sprayed a little WD 40 on the Quick dissconnect and applied a small amount of "O" ring lube to the ring prior to putting everything back together )

Posted on May 18, 2009

  • 11 Answers

SOURCE: my bike stopped running and was leaking coolant.

A coolant leak from the bottom of the cylinder indicates a blown base gasket. easy fix if you have a manual and some mechanical knowledge.
If you lost all you coolant, you may have also seized the piston.

you will require a top end gasket set, and most-likely a piston kit (Now is probably a good time to freshen that up anyway.)

If the engine was running good you probably did not get any coolant in your engine which is good.
-here is an idea of what is involved

dissasembly
(label everything and keep it nice and clean)

1) clean your bike good. You do not want dirt in the engine.
2) remove seat, fuel tank, rear subframe, and the pipe. This should give you easy access to everything.
3)drain whats left of your coolant into a bucket, the drain is usually one of the lower bolt holes on your impeller cover . A copper washer might give it away.
4) remove the carb from the boot going into your engine. the carb can stay connected hanging out of the way on its cables.
5) remove the cylinder head
6) remove any exhaust linkage covers if so equipped, and the screw holding the linkage. there may be a hole that will line up with a slot in the arm/clip. Use an appropriately sized drillbit to stop the thing from turning on you. Be careful, these are fragile (on Yamaha's anyway)
7)remove the 4 nuts holding the cylinder on. you should now be able to slide the cylinder off of the piston.

Inspection
& cleaning


Inspect the piston for any rough metal, scrapes or gouges. same with the cylinder. if damaged it will need to be replaced. Iron sleeved cylinders can be bored out 1 size and honed, nikasil can be cleaned of minor aluminum deposits with muriatic acid (don't get this on your skin) or will need to be replaced as a unit. Make sure there is no coolant inside the engine case. Crank should turn over smoothly with the bike in neutral.


Clean the old gasket off of the cases where the new base gasket will go. A plastic putty knife does wonders. make sure you get it all off, DO NOT use metal on the sealing surfaces. gasket remover can be used, but don't get any into the engine, and avoid using it where the bottom case halves are joined. Then stuff a rag in the case to keep it clean in the meantime.

Repeat the process for the cylinder, bottom and top if necessary.

Assembly
Check with your dealer for torque specs.
The piston kit should have instructions. Remove 1 circlip (don't lose it in the engine- (rag is in there right?). Slide the wrist pin out (long socket+ light tapping on it from the opposite side if you don't have a puller). CAUTION: I do not know if the wrist pin bearing is caged or not (check the new one when you get it) if it is not a caged bearing all the little roller pins will fall everywhere if you are not carefull. There is like 25 of them!
Now remove the piston, leaving just the rod. Prep the new piston (gap and install rings...line up gap with ring keeper pin...also, pay attention to orientation...some have an angle on the upper side of the ring. Install one of the circlips, rotate it so the gap does not line up with the hole, gap should be up or down not sideways. Install the wristpin bearing in the rod, slip on piston (usually arrow points to exhaust port...check instructions). now lube up the wristpin bearing and pin, slide pin through, and install the 2nd circlip.
Remove the rag, add a capfull or two of 2stroke into the bottom at this point. use a little break cleaner on a rag to make the gasket surface is clean.Throw down the new gasket. Line up ring in groves, Squeeze with one hand, and slide the cylinder down the piston. Once partway up, rotate the crank so the cylinder lines up with the studs. tighten nuts appropriately. Rotate it slow by the kickstart with the kilswitch held in the off position. Everything should be smooth. With the piston at the bottom throw a few capsfulls of oil in it to lubricate it as you rotate it through slowly. now clean the top, install topend gaskets and the nuts. Reassemble the bike in reverse order, make sure the carb is on tight, and don't forget to ADD COOLANT at proper ratio. Break in mix is gonna be 15:1 or 20:1 somwhere in there, for the first few hours riding anyway. Vary the throttle lots don't be afraid to run it though, just don't hold it WFO for more than a few seconds till everything gets happy. also, Especially when using FORGED pistons. Make sure the first time you start it, only let it idle, don't ride it. Let is get all the way up to temp, then let it cool completely. Do this heat cycle twice.
then continue normal break in.

I don't think I left anything out. Good luck.

Posted on May 20, 2009

OneRide
  • 379 Answers

SOURCE: HD 1979 fatboy fuel petcock valve leaking

Replace the petcock. The rubber diaphragm is ruptured. I'd also bet your fuel mileage dropped cause the ruptured diaphragm is allowing raw fuel to be sucked into the intake manifold.

Posted on Jul 23, 2009

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1 Answer

Fail e-test


Small EVAP leak
Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
Evaporative Emission (EVAP) canister or fuel tank leaks
Evaporative Emission (EVAP) system hose leaking
Fuel tank leaking

Sep 30, 2015 | 2008 Volkswagen Beetle

1 Answer

How to diagnose code p0456 on beetle


P0456 Volkswagen - EVAP System Very Small Leak Detected

- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Evaporative Emission (EVAP) canister or fuel tank leaks
- Evaporative Emission (EVAP) system hose leaking
- Fuel tank leaking

Sep 30, 2015 | 2008 Volkswagen New Beetle

3 Answers

What is code PO496 and PO455 for a 2007 Pontiac Grand Prix mean


P0496 is not alisted code.
P0455 - Evaporative Emission Control System Leak Detected Gross Leak (fuel vapors)
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors Possible causes - Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking

Jan 24, 2012 | 2007 Pontiac Grand Prix GXP Sedan

2 Answers

What is p 0455 mean?


P0455 Evaporative emmission control leak (gross leak). Here is the main possiblity the gas cap is out, or you filled up the fuel tank with the car running, because its a large leak you can visually inspect the fuel refill hose, If you have a shop that can inspect this for you they can find it .

Apr 27, 2011 | 2004 Suzuki Forenza

1 Answer

OIL LEAK ON FRAME BUT NOT FRON ENGINE


You didn't give me much information. If it's not from the engine, the only other thing on the bike that has oil in it is either an oil line or the oil tank. Sportsters are notorious for developing a leak on the backside of the oil tank, If you take the battery out and look at the bracket that comes from the oil tank to the battery tray, you may find your leak.

If the oil tank is leaking, purchase a new tank. I saw one guy try to stop the leak by coating the tank with "Creme" fuel tank coating. It did stop the leak but after a while the heat from the oil turned the coating brittle and it chipped off and stopped up his oil pump.

Good Luck
Steve

Apr 22, 2011 | 1993 Harley Davidson XLH Sportster 883

1 Answer

Fix engie light code p0442 Evaporative Emission Control, small leak detected


OBD II Code P0442 Evaporative System Malfunction, Small Leak Our emissions expert has put together the following information about the P0442 fault code. We have also included diagnostic procedures you can take to your repair shop if the mechanic is having difficulty analyzing the code.
Related Information Check Engine Light
Emission Gas Definitions

OBD II Fault Code
  • OBD II P0442
Fault Code Definition
  • Evaporative System Malfunction, Small Leak
Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be a noticeable fuel odor caused by the release of fuel vapors
Common Problems That Trigger the P0442 Code
  • Defective or damaged fuel cap
  • Distorted or damaged Fuel Tank Filler Neck
  • Small tear or puncture in the Evaporative system hose(s) and/or Carbon Canister
  • Defective Fuel Tank Sending Unit gasket or seal
  • Small split in a seam of the Carbon Canister
  • Defective Evaporative Vent Valve and/or Evaporative Purge Valve
  • Defective or damaged Fuel Tank
  • Defective Fuel Tank Pressure Sensor
  • Defective Leak Detection Pump
  • Slightly loose and/or worn clamps or hardened O-rings anywhere in the EVAP system
Common Misdiagnoses
  • Fuel cap
  • Evaporative Purge Valve
  • Evaporative Vent Valve
Basics
The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap). Under precise operating conditions-dictated by engine temperature, speed, and load-the EVAP system stores and purges these captured fuel vapors back into the combustion process.
Want to Learn More?
The EVAP system is designed not only to capture, store, and purge any raw fuel vapors that leak from areas in the Fuel Storage system, but also to run a series of self-tests that confirm or deny the operational and vapor holding ability of the system. This is an important task because at least 20 percent of vehicle-produced air pollution originates from malfunctioning Vehicle Fuel Storage systems.
There are many ways to "leak test" the EVAP system, but most perform the leak test when the vehicle is sitting (like over night) or during the initial start-up after the vehicle has been sitting over night. The EVAP system's operational performance is also tracked by the Power Train Computer by reading the change in the oxygen sensor voltages and short term fuel trim whenever the stored vapors are released or "purged" back into the combustion process. These values should indicate that fuel is being added to the system and that the overall mixture is getting richer. The purging process occurs when the vehicle is under acceleration, which is when most vehicles require additional fuel.

P0442 Diagnostic Theory for Shops and Technicians
The P0442 code indicates that there is a small leak in the EVAP system, but this is somewhat misleading. What the code really indicates is that the EVAP system will not hold a specified level of vacuum for a specified amount of time when it performs its leak test.
Here is how the evaporative leak test is performed by the Power Train Computer:
  1. When the leak test is performed, the vehicle must have been sitting for at least four to eight hours so that the engine temperature and outside air temperature are identical. There must also be between 15 and 85 percent fuel in the tank-this is to provide a baseline for the test since gasoline and diesel are volatile fluids that expand and vaporize easily with warm temperatures.
  2. When the leak test initiates, the Vapor Canister Vent Valve is closed to prevent any fresh air from entering the EVAP system. The Purge Valve is also sealed off.
  3. The Leak Detection Pump operates to build a vacuum in the entire Evaporative System (see the Leak Detection Pump information below). After a specified time interval-usually about ten seconds-the Purge Valve is shut off and the vacuum level in the system is measured by the Fuel Tank Pressure Sensor.
  4. Finally, a countdown initiates, which measures the rate at which the vacuum decays in the system. If the vacuum decays faster than the specified rate on two successive tests, then the Power Train Computer will fail the EVAP system and trigger the P0442 code. Most modern EVAP systems will fail the leak test with a pin-sized hole anywhere in the EVAP system, which amounts to 0.020 of an inch or a ½ millimeter.

Nov 26, 2010 | 2003 GMC Envoy

1 Answer

I have a 2000 Pontiac Bonneville 3.8 non supercharged. It is throwing the codes P0446, P0452, P0453. Yes it is throwing all of them and that is what is confusing me. Just reset the codes, did a...


they are all emission faults

P0453 OBD-II Trouble Code: Evaporative Emission Control Pressure Sensor High Input. P0453 code means that a reading from the engine's evaporative pressure sensor is higher than normal due to fuel tank vapor leaks into the system.

saturated carbon canister
sensor faulty
rubber evap hoses at the tank perished

idea
check the tank fuel cap seal is working
replace the cap is one possible cause

check the fuel pump pressure or for injector rail leak
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction. The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP).

The Code P0452 indicates that the Evaporative Pressure Sensor is indicating pressure change values that are below specification, during the EVAP Monitor test and/or the operation of the vehicle.


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Apr 28, 2017 | 2000 Pontiac Bonneville

1 Answer

Fuel leaking from air box after shutting down


Hi
Thats the float valve seals not shutting off, did you clean them & set the float heights?
The overflows from the carb bottoms must also be blocked for the fuel to fill up the carbs which then leaks into the air filter
Check also that the fuel tap turns off when bike is not running

Ride Safe
Bike-Doc

May 20, 2010 | 1985 kawasaki ZL 900 A1 Eliminator

1 Answer

The check engine light is on and the code is p0457


P0457 Evaporative Emission Control System Leak Detected. The Evaporative Emission Control System EVAP is designed to trap and store fuel that evaporates from the fuel tank, throttle body and intake manifold taht would normally enter the atmosphere. Fuel vapors are transferred from the tank and throttle body to a canister where theyre stored when the engine isnt running. When the engine is running, these vapors are used in combutions so every little bit of gas is used.

Poor Idle, stalling, and poor driveablility can be caused by an inoperative valve, damadged canister, split hoses, or hoses connected to the wrong place. Check the fuel cap for damage. Inspect each hose attached to the canister for leaks/cracks. Look for fuel leaking from the bottom of the canister as well. I hope this will help you.

Apr 10, 2010 | 2003 Ford Escape

1 Answer

1996 kawaswaki bayou carb. leaks gas from btm. when running


ues handle of screwdriver lightly tap on bowl if the leak stops use lucas injector cleaner in tank

Dec 12, 2008 | kawasaki Full Suspension Mountain Bike Men

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