Why doesn't it take gas at the pump?

Hi, Sounds like you are not releasing fuel vapor through the tank vent tube (or valve if so equipped) There is a small hose running along with the large filler hose from the filler entry (where you put gas in) to the tank. This is to release vapor as you fuel and as the fuel in tank heats up (expands). If you cannot release the vapor pressure, you cant fill the tank. (Physics of air/liquid replacement and pressure equalization) You can try disconnecting this tube and or try to find obstructions. Some have a valve in the tube allowing pressure to escape, but none to enter. (one-way valve) if it is malfunctioning (likely) it will give a back pressure of vapor error and also not equalize pressure in the tank when re fueling. Shop is gonna charge you a couple big bucks to drop tank and investigate. I would try to do some investigation myself to see if you can find either a vapor cannister that the vapor tube goes into, or a check/purge valve on the cannister or tank you can replace cheaply.......MIke
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SOUND LIKE EVAP CONTROL SYSTEM NOT WORKING.COULD HAVE STOPPED UP FUEL SOAK EVAP CHARCOAL CANISTER.OR THE PURGE SOLENOID NOT WORKING ALSO GAS CAP COULD BE FAULTY.HAVE THE EVAP SYSTEM CODE SCANNED.WHEN PUMPING GAS EASE THE GAS SPOUT OUT JUST A LITTLE SO YOU CAN PUMP GAS IN TAKE.REASON CAR WONT ACCEPT GAS BECAUSE EXCESS GAS VAPORS CAUSES PRESSURE TO BUILD UP IN FUEL TANK IN WHICH WILL KEEP GAS FROM BEING PUMPED IN FUEL TANK.

Removal & Installation To Remove:

1. Properly relieve the fuel system pressure.
2. Drain the fuel tank through the filler pipe.
3. Support the fuel tank.
4. Remove or disconnect the following:
   • Negative battery cable
   • Filler neck
   • Shield and tank straps
   • Fuel lines and vapor hose from pump and tank
   • Electrical connection from fuel pump
   • Fuel tank
   • Fuel pump/sending unit assembly by turning the locking ring (located on top of the fuel tank) counterclockwise using a spanner wrench
   • Fuel pump from the fuel lever sending device

To Install:

1. Install or connect the following:
   • Fuel pump in tank with new seal around opening
   • Tank and connect fuel lines and vapor hose
   • Tank to the frame
     1. Torque to: 33 ft. lbs. (45 Nm)
   • Shield
   • Fuel filler neck and clamp
   • Negative battery cable
2. Refill the tank.
3. Run the engine and check for leaks.

View of the in-tank fuel pump assembly.

probably your evaporation cannister. Holds gas vapors until engine can use them. Is there a problem with the cannister?

Tank Assembly REMOVAL & INSTALLATION CAUTION
The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in personal injury. 1988 Vehicles Fig. 1: Fuel tank mounting components
Fig. 2: Fuel tank insulator mounting positions

1. Disconnect the negative battery cable.
2. Properly relieve the fuel system pressure, as outlined earlier in this section.
3. Raise and safely support the vehicle.
4. Use a suitable hand operated pump device to drain the fuel through the filler tube into an approved container. CAUTION
   Observe all applicable safety precautions when working around gasoline. Do not allow fuel spray or fuel vapors to come in contact with a spark or open flame. Keep a dry chemical (Class B) fire extinguisher near the work area. Never drain or store fuel in an open container due to the possibility of fire or explosion.
   
5. Support the fuel tank with a suitable jack.
6. Remove the 2 bolts securing the fuel tank straps, then swing the straps out of the way.
7. Lower the fuel tank enough to disconnect the vapor hose from the fuel sender assembly and the vapor hose from the vapor pipe at the rear of the fuel tank.
8. Detach the electrical connector from the fuel sender assembly and remove the two retaining clips. If equipped, disconnect the ground strap.
9. Disconnect the fuel filler and vent hoses from the fuel tank.
10. Remove the tank from the vehicle, slowly to ensure all connections and hoses have been disconnected. To install:
    
11. Clean all parts well. Inspect the tank for dents, rust or other damage. On high-mileage vehicles, it may be good practice to remove the fuel pump module and replace the flexible strainer on the fuel pump.
12. Position the fuel tank under the vehicle and raise the tank with a suitable jack.
13. Connect the fuel feed and return lines to the sender assembly.
14. Attach the electrical connector to the fuel sender assembly. If equipped, connect the ground strap.
15. Raise the tank into position into the vehicle and swing the mounting straps under the tank.
16. Install the front fuel tank strap mounting bolts and tighten to 35 ft. lbs. (47 Nm).
17. Remove the jack.
18. Connect the fuel filler and vent hoses to the tank.
19. Carefully lower the vehicle, then refill the fuel system
20. Connect the negative battery cable, then install the fuel filler cap, if not done already.
21. Turn the ignition switch ON for 2 seconds, OFF for 10 seconds, then ON and check for fuel leaks.

1989–94 Vehicles

1. Disconnect the negative battery cable.
2. Properly relieve the fuel system pressure, as outlined earlier in this section.
3. Raise and safely support the vehicle. CAUTION
   Observe all applicable safety precautions when working around gasoline. Do not allow fuel spray or fuel vapors to come in contact with a spark or open flame. Keep a dry chemical (Class B) fire extinguisher near the work area. Never drain or store fuel in an open container due to the possibility of fire or explosion.
   
4. Use a suitable hand operated pump device to drain the fuel through the filler tube into an approved container. NOTE: Before disconnecting any fuel lines from the fuel tank, thoroughly clean around all hose connections.
   
5. Disconnect the fuel filler vent hose from the fuel tank.
6. Detach the fuel filler hose from the fuel filler inlet tube on the fuel tank. Position the hose out of the way.
7. Disconnect the vapor hose from the front of the fuel tank.
8. Detach the fuel return pipe and position the hose out of the way.
9. Disconnect the two rear rubber exhaust hangers from the rear of the exhaust system and allow the exhaust system to hang down slightly.
10. Unfasten the exhaust shield mounting bolts, then remove the exhaust shield.
11. Support the fuel tank with a suitable jack.
12. Remove the two bolts securing the fuel tank straps, then swing the straps out of the way.
13. Lower the fuel tank enough to disconnect the vapor hose from the fuel sender assembly and the vapor hose from the vapor pipe at the rear of the fuel tank.
14. Detach the electrical connector from the fuel sender assembly and remove the two retaining clips.
15. Remove the tank from the vehicle, slowly to ensure all connections and hoses have been disconnected. To install:
    
16. Clean all parts well. Inspect the tank for dents, rust or other damage. On high-mileage vehicles, it may be good practice to remove the fuel pump module and replace the flexible strainer on the fuel pump.
17. Position the fuel tank under the vehicle and raise the tank with a suitable jack.
18. Connect the vapor hose to the fuel tank at the vapor pipe at the rear of the tank and connect the vapor hose to the sender assembly.
19. Attach the electrical connector to the fuel sender assembly.
20. Connect the fuel feed and return lines to the sender assembly.
21. Raise the tank into position into the vehicle and swing the mounting straps under the tank.
22. Install the front fuel tank strap mounting bolts and tighten to 35 ft. lbs. (47 Nm).
23. Remove the jack.
24. Connect the fuel return pipe to the fuel feed pipe.
25. Attach the rear fuel feed pipe to the inlet side of the fuel filter.
26. Tighten the line fittings to 16 ft. lbs. (22 Nm). Make sure to use a back-up wrench to prevent the fuel filter from turning.
27. Connect the vapor hose to the vapor pipe at the front of the vehicle.
28. Attach the fuel filler vent hose to the tank. Connect the fuel filler hose to the fuel filler neck of the tank.
29. Install the exhaust heat shield and the mounting bolts.
30. Position the exhaust system and install the rubber hangers.
31. Carefully lower the vehicle, then refill the fuel system
32. Connect the negative battery cable, then install the fuel filler cap, if not done already.
33. Turn the ignition switch ON for 2 seconds, OFF for 10 seconds, then ON and check for fuel leaks.

I have 2002 Hyundai Accent. When fueling, I had to trickle the fuel in to prevent the fuel dispenser from constantly shutting off. Even then I could only get about a quarter gallon at a time between fuel shutoffs. Would take 10-15 minutes to put in 10 gallons. Very frustrating. I found and fixed the problem today. There is a charcoal cannister that is part of the Evaporative Emissions control system. It is located inside the rear fender well on the driver side, behind the driver side rear tire. You cant miss it. Actually looks like a square plastic box and it has hoses coming out of it. I removed the entire charcoal cannister assembly in about 15 minutes. Follow carefully. First, remove the electrical connector to the purge control valve (this valve assemby is mounted to the side of the charoal cannister on a bracket). No big deal. Then disconnect the three hoses that come out from the cannister assembly on the one side that faces the rear tire. Two of these hoses are small diameter about 1/4" and one is larger at about 5/8 inch diameter. Then you remove the 3 bolts that hold the whole cannister to the car frame. Then the whole piece comes out. Once I got the cannister and purge control valve out of the car as a whole assy I found the problem. The larger of the 3 hoses you disconnected as well as the port it connects to on the cannister was packed with the small charcoal pellets and actually formed a solid plug inside that larger hose. I had to stick a screw driver through that hose to knock the plug out that those charcoal pellets had formed. It all makes sense now. When you fill the tank with gas, you also push out air and vapor from the gas tank that is being displaced by the rising fuel in the tank. That vapor is supposed to go through that larger hose to the charcoal cannister where the fumes are removed by the charcoal. If that hose is plugged, like mine was, then the vapor has nowhere to go as you fill the tank and it increases pressure within the tank it causes the fuel dispenser nozzle to shutoff because it keeps detecting a pressure increase within the tank. That's my theory. I don't have the Hyundai design prints to confirm it. I had to tilt the charcoal dispenser so that the pellets came out of that larger hose port on the cannister. Like I said, even the port itself was full of pellets. So I poured out enough to clear the pellets that were in the hose port. I cleaned out the hose. Put everything back and went to go fill with gas. I filled that tank at full bore with no problem. Have the dealer or your mechanic check the ports and the hoses off the cannister. If they are filled with charcoal pellets, that is the problem. That should cost less than some of the fixes I have been reading about here.

P0441 - Evaporative Emission Control System Incorrect Purge Flow The "EVAP purge flow" faults are issues between the carbon cannister and the intake. The EVAP leak detection generally concerns the fuel tank to carbon cannister plumbing. A little background. The EVAP or evaporative emission system is a control system to keep vapors from evaporation in the fuel tank from getting into the atmosphere. The fuel tank is not vented, but rather the vapors are piped to the carbon cannister (usually located behind the pass. side front wheel) where the charcoal element absorbs the vapor. This is actually a vapor "storage" device. Under certain engine operating conditions, the ECU activates the Cannister Purge Valve (N80) which opens and allows the engine vacuum to **** the fuel vapors back out of the carbon cannister. This purges the vapor, allowing the cannister to absorb more vapor. This evap system has been on vehicles since the '70s. As part of the OBDII standard effective for 1996 cars and newer, it was mandated that leaks in the systems must be detected and reported as a fault which will set the Check Engine Light (CEL). To detect leaks, the system is pressurized by a pump so that leaks can be detected by a lack of appropriate pressure in the system. If there is a leak, such as a cracked vent hose, loose (or leaky) gas cap, poorly installed or defective O-rings on the fuel level senders on the fuel tank, etc. a code will be set. On the cannister to intake side, leaks are detected by deviations in the idle control system. If you have leaks in the lines from the carbon cannister to the intake, intake leaks, a defective purge valve, etc you will often get purge flow faults. My first recommendation is to closely inspect all the small vacuum lines connected to the intake manifold. The corrugated plastic lines are often the culprits, as well as the fabricate covered vacuum lines. Also consider replacing the gas cap.

Evaporative Emission Control System Incorrect Purge Flow
The "EVAP purge flow" faults are issues between the carbon cannister and the intake. The EVAP leak detection generally concerns the fuel tank to carbon cannister plumbing.
A little background. The EVAP or evaporative emission system is a control system to keep vapors from evaporation in the fuel tank from getting into the atmosphere. The fuel tank is not vented, but rather the vapors are piped to the carbon cannister (usually located behind the pass. side front wheel) where the charcoal element absorbs the vapor. This is actually a vapor "storage" device. Under certain engine operating conditions, the ECU activates the Cannister Purge Valve (N80) which opens and allows the engine vacuum to **** the fuel vapors back out of the carbon cannister. This purges the vapor, allowing the cannister to absorb more vapor. This evap system has been on vehicles since the '70s.
As part of the OBDII standard effective for 1996 cars and newer, it was mandated that leaks in the systems must be detected and reported as a fault which will set the Check Engine Light (CEL). To detect leaks, the system is pressurized by a pump so that leaks can be detected by a lack of appropriate pressure in the system. If there is a leak, such as a cracked vent hose, loose (or leaky) gas cap, poorly installed or defective O-rings on the fuel level senders on the fuel tank, etc. a code will be set. On the cannister to intake side, leaks are detected by deviations in the idle control system. If you have leaks in the lines from the carbon cannister to the intake, intake leaks, a defective purge valve, etc you will often get purge flow faults.
My first recommendation is to closely inspect all the small vacuum lines connected to the intake manifold. The corrugated plastic lines are often the culprits, as well as the fabricate covered vacuum lines. Also consider replacing the gas cap.

Evaporative Emission Control System Incorrect Purge Flow The "EVAP purge flow" faults are issues between the carbon cannister and the intake. The EVAP leak detection generally concerns the fuel tank to carbon cannister plumbing. A little background. The EVAP or evaporative emission system is a control system to keep vapors from evaporation in the fuel tank from getting into the atmosphere. The fuel tank is not vented, but rather the vapors are piped to the carbon cannister (usually located behind the pass. side front wheel) where the charcoal element absorbs the vapor. This is actually a vapor "storage" device. Under certain engine operating conditions, the ECU activates the Cannister Purge Valve (N80) which opens and allows the engine vacuum to **** the fuel vapors back out of the carbon cannister. This purges the vapor, allowing the cannister to absorb more vapor. This evap system has been on vehicles since the '70s. As part of the OBDII standard effective for 1996 cars and newer, it was mandated that leaks in the systems must be detected and reported as a fault which will set the Check Engine Light (CEL). To detect leaks, the system is pressurized by a pump so that leaks can be detected by a lack of appropriate pressure in the system. If there is a leak, such as a cracked vent hose, loose (or leaky) gas cap, poorly installed or defective O-rings on the fuel level senders on the fuel tank, etc. a code will be set. On the cannister to intake side, leaks are detected by deviations in the idle control system. If you have leaks in the lines from the carbon cannister to the intake, intake leaks, a defective purge valve, etc you will often get purge flow faults. My first recommendation is to closely inspect all the small vacuum lines connected to the intake manifold. The corrugated plastic lines are often the culprits, as well as the fabricate covered vacuum lines. Also consider replacing the gas cap.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152801dbaf3

when you drop the tank by following these directions you will have access to the pump

1989-94 Vehicles
See Figures 1 and 2

1. Disconnect the negative battery cable.
2. Properly relieve the fuel system pressure, as outlined earlier in this section.
3. Raise and safely support the vehicle.

CAUTION Observe all applicable safety precautions when working around gasoline. Do not allow fuel spray or fuel vapors to come in contact with a spark or open flame. Keep a dry chemical (Class B) fire extinguisher near the work area. Never drain or store fuel in an open container due to the possibility of fire or explosion.

1. Use a suitable hand operated pump device to drain the fuel through the filler tube into an approved container.

Before disconnecting any fuel lines from the fuel tank, thoroughly clean around all hose connections.

1. Disconnect the fuel filler vent hose from the fuel tank.
2. Detach the fuel filler hose from the fuel filler inlet tube on the fuel tank. Position the hose out of the way.
3. Disconnect the vapor hose from the front of the fuel tank.
4. Detach the fuel return pipe and position the hose out of the way.
5. Disconnect the two rear rubber exhaust hangers from the rear of the exhaust system and allow the exhaust system to hang down slightly.
6. Unfasten the exhaust shield mounting bolts, then remove the exhaust shield.
7. Support the fuel tank with a suitable jack.
8. Remove the two bolts securing the fuel tank straps, then swing the straps out of the way.
9. Lower the fuel tank enough to disconnect the vapor hose from the fuel sender assembly and the vapor hose from the vapor pipe at the rear of the fuel tank.
10. Detach the electrical connector from the fuel sender assembly and remove the two retaining clips.
11. Remove the tank from the vehicle, slowly to ensure all connections and hoses have been disconnected.

To install:

1. Clean all parts well. Inspect the tank for dents, rust or other damage. On high-mileage vehicles, it may be good practice to remove the fuel pump module and replace the flexible strainer on the fuel pump.
2. Position the fuel tank under the vehicle and raise the tank with a suitable jack.
3. Connect the vapor hose to the fuel tank at the vapor pipe at the rear of the tank and connect the vapor hose to the sender assembly.
4. Attach the electrical connector to the fuel sender assembly.
5. Connect the fuel feed and return lines to the sender assembly.
6. Raise the tank into position into the vehicle and swing the mounting straps under the tank.
7. Install the front fuel tank strap mounting bolts and tighten to 35 ft. lbs. (47 Nm).
8. Remove the jack.
9. Connect the fuel return pipe to the fuel feed pipe.
10. Attach the rear fuel feed pipe to the inlet side of the fuel filter.
11. Tighten the line fittings to 16 ft. lbs. (22 Nm). Make sure to use a back-up wrench to prevent the fuel filter from turning.
12. Connect the vapor hose to the vapor pipe at the front of the vehicle.
13. Attach the fuel filler vent hose to the tank. Connect the fuel filler hose to the fuel filler neck of the tank.
14. Install the exhaust heat shield and the mounting bolts.
15. Position the exhaust system and install the rubber hangers.
16. Carefully lower the vehicle, then refill the fuel system
17. Connect the negative battery cable, then install the fuel filler cap, if not done already.
18. Turn the ignition switchONfor 2 seconds, OFF for 10 seconds, thenONand check for fuel leaks.