Fuel filler neck leaking gas on suzuki esteem

you can buy the filler part for that 99 mercury mystique

Fuel Tank Filler Neck

no year, huh? some years have a check valve , there,....
this forum is for usa cars, is car USA car?
the tanks just dont like siphoning. (check valve)
the FSM covers this , in the fuel section under bad pump.
1998 to 2006, ill guess, 06

i have the FSM and does not cover. bad fuel, no drain plug.

it shows how to get fuel lower, in filler neck
the tank has check valve at it its metal neck.
so inserting a hose in filler, will hit this check valve.
and all you get out , is 1/2 fuel.
id use the tank out procedure.
then empty all fuel, after step 5.
quote:

1. Disconnect the negative battery cable.
2. Relieve fuel pressure in fuel feed line.
3. Due to absence of fuel tank drain plug, drain fuel tank by pumping fuel out through fuel tank filler.
4. Use hand operated pump device to drain fuel tank.
5. Remove fuel tank.

tip tank to drain the remainder. out

here is one more way. (IDEA!)
do 1-4
then tip car to left. Jacks then stands at frame.
then remove the filler hose on tank
remove that pesky check valve. from neck last.

and pump out the rest.

The FSM is clear on this. each hose and fitting must be air tight.
or the the car vents gas fumes full time, and the EVAP ECU tests
(monitor) make sure this all works.
you can just look at the left and right side above rear tires. and see
if your hands are small enough to fit here. Id bet not.
some mech, report, the tank can be tilted down at front (drained fuel)
and gain access.
keep in mind, you get fuel siphoning at any time. do not open the system, with fuel in the tank, and then drive to autozone,
i loosen the gas cap so that pressure can not build in tank.
expanding fuel can push fuel out , during a filter change. very
dangerous in a garage, and you gone.
it's just a vent hose, you can see, it and what needs to be done is really obvious. given you arms sides and lenght.
my fsm states, " TANK pull"

Removal & Installation

1. Relieve the fuel system pressure and disconnect the negative battery cable.
   
2. Remove the fuel filler cap from the fuel tank.
   
3. Have a Class B fire extinguisher near the work area. Use a hand operated pump device to drain as much fuel through the fuel filler neck as possible.
   
4. Use a siphon to remove the remainder of the fuel in the tank by connecting the siphon to the fuel pump outlet fitting.
   CAUTION Never drain or store fuel in an open container because there is the possibility of a fire or an explosion.
   
5. Reinstall the fuel filler cap.
   
6. Remove the rear seat cushion from vehicle (if so equipped).
   
7. Disconnect the fuel pump motor connector and sending unit electrical connectors.
   
8. Disconnect the wire harness grommet and harness through the vehicle floor pan.
   
9. Raise and safely support the vehicle.
   
10. Remove the fuel filler hose clamp from the filler neck assembly.
    
11. Remove the fuel breather hose clamp from the filler neck assembly.
    
12. Remove the fuel filter inlet hose clamp and hose from the filter.
    NOTE A small amount of fuel may be released after the fuel hose is disconnected. In order to reduce the chance of personal injury, cover the fitting to be disconnected with a shop towel.
    
13. Remove the fuel vapor clamp and hose, and fuel return hose clamps and hose from the respective fuel lines.
    
14. Using a suitable transaxle jack, support the fuel tank.
    
15. Remove the fuel tank retaining bolts and lower the tank.
    

To install:

1. Reconnect all fuel hoses, lines and the fuel breather hose to the fuel tank.
   
2. Place the fuel tank in its proper space using the transaxle jack, Install the fuel tank retaining bolts.
   
3. Remove the transaxle jack.
   
4. Reconnect all fuel hoses, lines and the fuel breather hose to the fuel tank.
   
5. Install the fuel breather hose and hose clamp to the filler neck assembly.
   
6. Install the fuel vapor hose and hose clamps. Install the fuel return hose and hose clamp to the respective fuel lines.
   
7. Install the fuel filter inlet hose and hose clamp to the filter.
   
8. Lower the vehicle. Install the wire harness and grommet through the vehicle floor pan.
   
9. Connect the fuel pump motor and the sending unit connectors.
   
10. Install the rear seat cushion. Reconnect the negative battery cable.
    

"

if you can cut out the bad spot replace it with a piece of radiator hose

Clean off the rust

The Check Light doesn't mean the
filler neck is the issue, unless you got
a code for a small Evap Leak & then
it could be any of 10 things & maybe
a bad gas cap

Replace your filler neck. It's not hard and when you buy the new one, installation should be obvious and rather straight forward.

A fuel leak is not something to take lightly and it will get worse over time.

Most fuel systems are pressurized (that's why you'll sometimes hear a hissing sound when you open your cap) so if your filler neck is leaking it can throw a code.

There could be a tiny rust hole in the fuel filler neck ,or the cap may not be sealing the filler neck properly. Check for rust on the filler neck, and on the sealing surface of the filler neck opening.

if it's a hose or pipe go to dealer or junk yard get another if broken clamp replace if neck part of tank call rad shop see if the can solder if you drain & pull tank

sounds like the fuel tank is building up pressure because of gas expansion. See if the fuel vent line is bent or kinked, if this is o.k change your fuel cap.