I have a fuel leak at the quick connect on top of the fuel tank under the rear seat. I have replaced the fuel line and it still leaks. There is a plastic piece on top of the tank, should that be replaced also?

Probably best to replace that too as having new items means that in the long run you have security in knowing what parts are new. May be a poor seal around the plastic bit, but also check the clips you are using are tight enough, possibly buy some new if loose

google youtube and find out if there is a video pertaining to changing your fuel pump..U might be able to access it from under the back seat or from in the trunk...there for u wont have to drop the tank..sounds like a bad fuel hose from tank to fuel filter via Engine

If the fuel is leaking into the car you will need the replace the seal on the top on the pump assembly not the seals on the pump itself but before changing the seal just double check the fuel lines are tight and the leak is actually from the fuel splashing out of the tank. The seal your after is referred to as the pump assembly oring ( big rubber oring around the top of the assembly a smear of silcone can be used as a temporary fix but erge you to get it fix properly as soon as possible and fuel fumes in the cabin can be extremely deadly)
Hope this helps

first locate approx area of leak, wet spot, smell. fuel lines run from top of tank in rear of vehicle to the front usually alomg the inside frame rail on drivers side and up into engine compartment (under the hood) to the back of the motor. it runs into fuel rail assy where the injectors are passing through a fuel regulator first. fuel line will have a valve similar to that on a bicycle or car tire and should have a tag on it, sometimes its on the fuel rail. trace the fuel line tu the fuel tank or from the tank to engine compartment while its running, in park with emergency/parking brake on to accurately locate leak but be careful for fuel that may be spraying. i recomend safety glasses and a flashlight. most common leaks are due to worn/bad seals in the "quick connect" connections or a crack it the line itself.

IT MIGHT HAVE COME FROM THE FILLER TUBE TO THE GAS TANK! OR POSSIBLY ONE OF THE FUEL LINES ATTACHED TO THE TOP OF THE TANK! ON A NEWER CAR, YOU CAN ACCESS THE FUEL PUMP INLET FROM UNDER THE BACK SEAT! DEFINATELY CHECK THIS OUT, AS IT CAN CAUSE A FIRE, AND YOU COULD GET HURT!

Removal & Installation
To Remove:

1. Before servicing the vehicle, refer to the precautions at the beginning of
   this section.
   
2. Release fuel pressure.
   
3. Remove or disconnect the following:
   
   
   
   • The rear seat
     
     
     
     
     
     Electrical Connector
     
     
     
     
     
   • The fuel pump electrical connector
     
     
     
     
     
     Battery Cable
     
     
     
     
     
   • Battery cable
   
   
4. Raise and safely support the vehicle
   
5. Remove or disconnect the following:
   
   
   
   
   
   Fuel Tank Drain
   
   
   
   
   
   
   
   • Fuel from fuel tank
     
     
     
     
     
     Stabilizer Bar
     
     
     
     
     
     
     
     
     
     Stabilizer Bar and EVAP Canister
     
     
     
     
     
   • The rear stabilizer bar brackets from body
     
   • Stabilizer bar toward rear of vehicle
     
     
     
     
     
     Fuel Filler Tube
     
     
     
     
     
   • The fuel filler tube from fuel tank
     
     
     
     
     
     Fuel And EVAP Lines
     
     
     
     
     
   • Fuel and EVAP lines
   
   
6. Position transmission jack under fuel tank assembly.
   
7. Remove fuel tank straps bolts passenger side first.
   
8. Lower fuel tank and remove the purge line and vent line.
   
9. Disconnect fuel line from fuel pump module by depressing quick connect
   retainers with thumb and fore finger.
   
10. Slide fuel pump module electrical connector lock to unlock.
    
11. Disconnect the electrical connection from the fuel pump module, by pushing
    down on connector retainer and pulling connector off of module.
    
    
    
    
    
    Fuel Tank Locknut
    
    
    
    
    
12. Use Special Tool # 6856 to remove fuel pump module locknut.
    
13. Remove fuel pump and O-ring seal from tank. Discard old seal.

To Install:

1. Wipe seal area of tank clean and place a new seal in position in the tank
   opening.
   
   
   
   
   
   Fuel Tank Locator
   
   
   
   
   
2. Position fuel pump in the tank.
   
   
   
   • Make sure the alignment tabs on the underside of the fuel pump module flange
     sits in the notches on the fuel tank.
   
   
3. Position the locknut over the fuel pump module.
   
4. Tighten the locknut using Special Tool # 6856
   
   
   
   • Torque to: 40.5 ft. lbs. (55 Nm)
   
   CAUTION
   Over tightening the pump lock ring may
   result in a leak.
   
   
5. Position the fuel tank on the transmission stand.
   
6. Install or connect the following:
   
   
   
   • Fuel pump electrical connector into hole in the body
     
   • The purge and vent lines
     
   • Fuel tank and tank straps
     
   • The fuel filler tube and tighten the clamp
     
   • The stabilizer bar and install bolts
   
   
7. Lower vehicle.
   
8. Install or connect the following:
   
   
   
   • The fuel pump electrical connector that is in the rear seat
     
   • The rear seat
     
   • The battery cable
   
   
9. Fill fuel tank.
   
10. Use the DRB or equivalent scan tool to pressurize the fuel system.
    
11. Check for leaks.

you need to locate leak quickly and fix.this is a fire hazard look under hood check for gas leaks around fuel pressure regulator.and fuel lines going to fuel injectors.also go to rear of car under where gas tank located and check fuel lines around fuel tank and fuel filter for leaks.

The fuel filter (1) is mounted next to the fuel pump module (2), on top of the fuel tank (3)


The fuel delivery system uses quick-connect fittings. The fuel filter mounts to the top of the fuel tank.

1. Properly relieve the fuel system pressure.
   
2. Disconnect the negative battery cable.
   
3. Raise and safely support the vehicle.
   
4. Place a drain pan underneath the fuel filter to catch any spilling fuel that will result from disconnecting the fuel lines.
   

It may be necessary to support the weight of the fuel tank with a block of wood and a floor jack. Once this is accomplished, loosen, but do not remove, the fuel tank strap bolts. Allow the fuel tank to lower just enough to access the fuel line fittings at the fuel pump module.



Disengage the fuel line quick-connect fittings from the fuel pump module


Be sure to place a drain pan underneath the filter line fittings to catch all fuel spillage

Locate the fuel filter in its mounting on top of the fuel tank. Detach the quick-connect fittings from the chassis fuel supply tube and fuel pump module by squeezing the quick-connect fitting retainer tabs together and pulling the fitting assembly away from the fuel line nipple. The retainer will remain on the fuel tube.


Using a 10mm socket, remove the fuel filter mounting bolt ...


... then remove the fuel filter from the top of the fuel tank

1. Remove the fuel filter mounting bolt and remove the fuel filter from the fuel tank.
   

To install:

1. Install the fuel filter on the top of the fuel tank and tighten the mounting bolt.
   
2. The fuel supply tube (to chassis fuel line), return tube (to pump module) and fuel supply (to fuel filter) tube are permanently attached to the fuel filter. The quick-connect fitting ends of the fuel supply and return tubes are of different sizes.
   
3. Apply a light coating of 30W engine oil to the nipples of the fuel filter.
   
4. Push the quick-connect fitting over the fuel line until the retainer seats and clicks into place. Be sure the retainer tabs have locked into the case of the fitting.
   
5. If necessary, raise the fuel tank and tighten the fuel tank strap bolts.
   
6. Lower the vehicle. Start the engine and check for leaks.
   

I would trace fuel lines from tank to fuel rail on motor. These are high pressure lines so do not try to quick-fix them. You will have to measure the lines and replace them if they are leaking. Unless the fuel is leaking from lines by fuel rail or by fuel filter.

if the gas is leaking from the top of the tank, 10 to 1 it's either the fuel line, or the top part of the sending unit which is probably made of plastic, is cracked where the fuel line connects to.The tank should be empty or near it, easier to drop, loosen the tank strap bolts towards the front, then remove the rear ones one at a time, as you take the last rear bolt out, the tank should drop a little. Becarful of the wire connection and fuel line, drop it slowly enough to reach in and disconnect them.If the unit has a plastic hose connection, it needs replacing. good luck.