When filling the automatic shut off, from the gas pump, keeps on shutting off the gas as if the tanks is full when it is not. Quick inspection of hoses etc look ok.. any suggestions. Thanks
Robison
I too have had this occure,If you pull the nozzle out about a quarter of the way the pump should then resume pumping. Sometimes the filler pipe on some vehicles is on a sharp angle just inside the opening and when you stick the nozzle in all the way it causes the fuel to splash back restricting the flow and auto shutting down the pump.
Hope this helps, Accent sport. :thumbsup:
Hope this helps, Accent sport. :thumbsup:
In the old days cars would just let the gas fumes from the tank vent into the air. These days cars will recapture those fumes are burn them. Sometimes that vent tube which sends the fumes to engine can become clogged, could be something as simple as a spider crawled in there. When that vent tube becomes clogged it can cause this problem. Kind of like the old days when you would have to puncture a can to pour out its contents. You have to puncture two spots across from each other so one side acts like a vent. Same thing with a gas tank, the air inside needs to escape to somewhere as gas is introduced. Its a possibility. Or maybe you just need to pull it out a little like the last post said.
Well, I'm having the same problem. I turn and held the nozzle different ways at three different filling stations with the same results. I removed the EVAP canister, checked the Air Filter attached to the Canister close Valve and clean it. It wasn't clogged or even that dirty. I ran a weed trimmer line down the vent line and it didn't seem clogged.
Here is an excerpt from another forum by techdqs. http://www.hyundaiforum.com/forum/showthread.php?p=20334
"There are numerous complaints of Hyundai vehicles being hard/slow to fill with fuel. The general indication is that when refueling, the gas pump shuts off repetitively after only adding a minor volume of gas – usually ¼ gallon or less. The fuel seems to back up into the fill tube, causing the automatic shut off on the pump to activate. The fuel gradually subsides in the filler neck, and another ¼ gallon or so can be added before shutting off again.
There are two general possibilities which would cause the issue: (a) a restriction directly preventing fuel from entering the tank, or (B) a restriction preventing vapors from exiting the tank and thus not allow fuel to enter. All cars built from 1999 onward have had included an onboard fueling vapor recovery system. What this means in a nutshell is that fumes from the entire fuel system are no longer vented to the outdoors, but are instead re-cycled through the vehicle air intake system.
(a) Those things that can directly restrict fuel fill include damage to any part of the filler neck or gas tank:
1. Damaged filler neck
2. Pinched or twisted hose between filler neck and tank
3. One-way fill valve in tank (at the filler entrance to the tank) sticking shut
4. Tank damaged under fill entrance to tank.
(B) Things that can prevent proper venting include blockages anywhere in the onboard vapor recovery system:
1. Blocked leak detection pump outlet
2. Restricted charcoal canister filter
3. Restricted charcoal canister itself (usually by liquid fuel in canister)
4. Sticking vent valve (sometimes called rollover valve) in top of fuel tank
5. Any of the vapor hoses from the tank to the canister to the leak detection pump pinched or twisted.
One of the most common causes of blockage in the venting system is from fuel entering the vapor vent lines and directly into the charcoal canister. The liquid gasoline gets absorbed by the charcoal in the canister, causing it to swell and it blocks off the vapor vent lines. So how does a clogged canister filter prevent you from filling up with gas? The gas tank contains both fuel and air. As you fill it up, the gasoline displaces the air, and the air has to escape somehow. BUT the air that is displaced is full of gasoline vapor. Being harmful to the atmosphere, it can't just be vented directly into the air, so the vapor recovery system is set up to capture these vapors through a series of vent lines that lead to a square box full of charcoal, which absorbs the gas vapors. When the gas-soaked charcoal swells and blocks off the vent lines, it is preventing the air from escaping the tank. In order to put gas in, the air has to have some way of getting out, and the only way for it to get out is through the vent lines. The repair here involves replacing one of the components in the fuel vapor recovery system. (one-way valve in the tank, vent valve in the tank, liquid-vapor separator near the tank, carbon canister or canister close valve.) The most common first choice for repair is the canister, but the other components may well be plugged.
1. Canister close valve could be clogged with charcoal or not working
2. Canister filter may need replacement
3. Electrical connection to the close valve may be broken
4. Canister may be damaged
5. Purge valve from the canister may be clogged
6. Vent hoses may be clogged
The only real solution is a thorough step-by-step trouble shooting approach as described below.
General diagnostic procedures: hard-to-fill fuel tank
All 1999 and later Hyundai vehicles incorporate an emission control system known as On-Board Refueling Vapor Recovery (ORVR). A general schematic of the system is provided below. Some owners may experience difficulty filling their vehicle with gasoline and a premature shut off condition. Following are trouble shooting steps to be taken.
Step 1- Isolate which half of the system is blocked: Verify that the 1/2" vapor path from the fill vent valve on the gas tank to the air filter on the charcoal canister (see schematic below) is completely free and clear. Make sure the fuel tank is below 1/4 tank full. Disconnect the hose connected to the canister side of the liquid-vapor separator (see schematic below). Take the vehicle to a known "good" or major brand gas station. If the vehicle readily accepts fuel, the restriction is located between the liquid vapor separator and the air filter. If the vehicle does not easily accept fuel, the restriction is located between the liquid vapor separator and the fuel tank.
On-Board Refueling Vapor Recovery (ORVR) Schematic: The following components are contained in the ORVR system: Fuel Cut Valve, Fuel Fill Vent Valve, (anti-spit back), Liquid-Vapor Separator, Charcoal Canister, Canister Close Valve, Air Filter all connected by various hoses and pipes. 1999 Sonata and Accent have additional components as shown.
Step 2: After the restriction has been isolated to either half of the system, inspect each component to make sure it is free and clear of any restrictions Do this by verifying that no back pressure can be felt anywhere between the fill vent valve and the air filter at the canister.
If the tank filled easily when disconnecting the vapor hose to the canister (meaning the blockage is in the canister or close valve), inspect the canister and replace the filter if needed, and the canister if broken. Replace the canister close valve if clogged Check by blowing with lung pressure. The Charcoal Canister filter is located with the canister at the left rear corner of the vehicle. You'll need to remove one or two 12mm bolts/nuts to lower the canister assembly. You'll then need to separate the canister close valve from the filter and snap it off the canister.
If the tank does not fill easily when the canister is disconnected, the blockage is between the tank and the canister.
First check for obvious problems that would prevent fuel from entering the gas tank:
1. Damaged filler neck
2. Pinched or twisted hose between filler neck and tank
3. Tank damaged under fill entrance to tank.
Then check for kinked hoses in the vent lines, that can cause back pressure.
Then check for restrictions in the liquid vapor separator, by blowing through one end of the pipe using lung power. NO back pressure should be felt.
Then, verify that the Fill Vent Valve is open by carefully removing the valve and confirming that the white plastic shut-off plunger moves freely inside its cage. This valve is accessed from the top of the gas tank.
Then check the Fuel cut valve for restrictions. This is also accessed from the top of the fuel tank. If the fuel cut valve plunger is stuck closed, a hard-to-fill condition may result. Verify that the plunger moves up and down freely allowing fuel to enter the tank, but does not allow fuel to travel up the neck (under pressure). The plunger should be "up" (closed) in its free state.
IMPORTANT When working with the Fill Vent Valve and associated plumbing, be sure to replace the hoses into the proper hose clips to prevent fuel from getting trapped / puddled in the vapor hose. Return fuel from the liquid-vapor separator must have a clear path to drain back to the tank.
Special Notes:
(a) 1999 Sonatas have a Four Way Valve located between the liquid vapor separator and fuel tank.. The Four Way Valve provides an additional vapor path to the canister during refueling.
Proper operation of the valve is as follows: Air flows freely in either direction through the 1/2" ports. Air flows freely in either direction through the 1/4" ports. Air flows from 1/2" port to the 1/4" port when blowing into one of the 1/2" ports while plugging the other 1/2" port. Air does not flow from 1/4" port to the 1/2" port when blowing into one of the 1/4" ports while plugging the other 1/4" port
(B) Also NOTE that 1999 Accents have two (2) liquid vapor separators: one located on top of the fuel tank, the other located alongside the filler neck.
© Also note that one owner had a novel, no-cost solution. You can give it a try before investing in the long-term solution. Here is his feedback: “I have the same type of quirkiness on my 01' Elantra. My fix was to fill up when the gas needle is at the half way mark rather then when it's on empty. I was told by an attendant that fumes can build up in the tank and the pressure can cause the gas nozzle to pop out. I was guilty of driving around on near empty then only filling up but since I started filling up it up when the needle is at the half way mark the problem went away. You may have to do this a couple of times before the problem goes away.”
"There are numerous complaints of Hyundai vehicles being hard/slow to fill with fuel. The general indication is that when refueling, the gas pump shuts off repetitively after only adding a minor volume of gas – usually ¼ gallon or less. The fuel seems to back up into the fill tube, causing the automatic shut off on the pump to activate. The fuel gradually subsides in the filler neck, and another ¼ gallon or so can be added before shutting off again.
There are two general possibilities which would cause the issue: (a) a restriction directly preventing fuel from entering the tank, or (B) a restriction preventing vapors from exiting the tank and thus not allow fuel to enter. All cars built from 1999 onward have had included an onboard fueling vapor recovery system. What this means in a nutshell is that fumes from the entire fuel system are no longer vented to the outdoors, but are instead re-cycled through the vehicle air intake system.
(a) Those things that can directly restrict fuel fill include damage to any part of the filler neck or gas tank:
1. Damaged filler neck
2. Pinched or twisted hose between filler neck and tank
3. One-way fill valve in tank (at the filler entrance to the tank) sticking shut
4. Tank damaged under fill entrance to tank.
(B) Things that can prevent proper venting include blockages anywhere in the onboard vapor recovery system:
1. Blocked leak detection pump outlet
2. Restricted charcoal canister filter
3. Restricted charcoal canister itself (usually by liquid fuel in canister)
4. Sticking vent valve (sometimes called rollover valve) in top of fuel tank
5. Any of the vapor hoses from the tank to the canister to the leak detection pump pinched or twisted.
One of the most common causes of blockage in the venting system is from fuel entering the vapor vent lines and directly into the charcoal canister. The liquid gasoline gets absorbed by the charcoal in the canister, causing it to swell and it blocks off the vapor vent lines. So how does a clogged canister filter prevent you from filling up with gas? The gas tank contains both fuel and air. As you fill it up, the gasoline displaces the air, and the air has to escape somehow. BUT the air that is displaced is full of gasoline vapor. Being harmful to the atmosphere, it can't just be vented directly into the air, so the vapor recovery system is set up to capture these vapors through a series of vent lines that lead to a square box full of charcoal, which absorbs the gas vapors. When the gas-soaked charcoal swells and blocks off the vent lines, it is preventing the air from escaping the tank. In order to put gas in, the air has to have some way of getting out, and the only way for it to get out is through the vent lines. The repair here involves replacing one of the components in the fuel vapor recovery system. (one-way valve in the tank, vent valve in the tank, liquid-vapor separator near the tank, carbon canister or canister close valve.) The most common first choice for repair is the canister, but the other components may well be plugged.
1. Canister close valve could be clogged with charcoal or not working
2. Canister filter may need replacement
3. Electrical connection to the close valve may be broken
4. Canister may be damaged
5. Purge valve from the canister may be clogged
6. Vent hoses may be clogged
The only real solution is a thorough step-by-step trouble shooting approach as described below.
General diagnostic procedures: hard-to-fill fuel tank
All 1999 and later Hyundai vehicles incorporate an emission control system known as On-Board Refueling Vapor Recovery (ORVR). A general schematic of the system is provided below. Some owners may experience difficulty filling their vehicle with gasoline and a premature shut off condition. Following are trouble shooting steps to be taken.
Step 1- Isolate which half of the system is blocked: Verify that the 1/2" vapor path from the fill vent valve on the gas tank to the air filter on the charcoal canister (see schematic below) is completely free and clear. Make sure the fuel tank is below 1/4 tank full. Disconnect the hose connected to the canister side of the liquid-vapor separator (see schematic below). Take the vehicle to a known "good" or major brand gas station. If the vehicle readily accepts fuel, the restriction is located between the liquid vapor separator and the air filter. If the vehicle does not easily accept fuel, the restriction is located between the liquid vapor separator and the fuel tank.
On-Board Refueling Vapor Recovery (ORVR) Schematic: The following components are contained in the ORVR system: Fuel Cut Valve, Fuel Fill Vent Valve, (anti-spit back), Liquid-Vapor Separator, Charcoal Canister, Canister Close Valve, Air Filter all connected by various hoses and pipes. 1999 Sonata and Accent have additional components as shown.
Step 2: After the restriction has been isolated to either half of the system, inspect each component to make sure it is free and clear of any restrictions Do this by verifying that no back pressure can be felt anywhere between the fill vent valve and the air filter at the canister.
If the tank filled easily when disconnecting the vapor hose to the canister (meaning the blockage is in the canister or close valve), inspect the canister and replace the filter if needed, and the canister if broken. Replace the canister close valve if clogged Check by blowing with lung pressure. The Charcoal Canister filter is located with the canister at the left rear corner of the vehicle. You'll need to remove one or two 12mm bolts/nuts to lower the canister assembly. You'll then need to separate the canister close valve from the filter and snap it off the canister.
If the tank does not fill easily when the canister is disconnected, the blockage is between the tank and the canister.
First check for obvious problems that would prevent fuel from entering the gas tank:
1. Damaged filler neck
2. Pinched or twisted hose between filler neck and tank
3. Tank damaged under fill entrance to tank.
Then check for kinked hoses in the vent lines, that can cause back pressure.
Then check for restrictions in the liquid vapor separator, by blowing through one end of the pipe using lung power. NO back pressure should be felt.
Then, verify that the Fill Vent Valve is open by carefully removing the valve and confirming that the white plastic shut-off plunger moves freely inside its cage. This valve is accessed from the top of the gas tank.
Then check the Fuel cut valve for restrictions. This is also accessed from the top of the fuel tank. If the fuel cut valve plunger is stuck closed, a hard-to-fill condition may result. Verify that the plunger moves up and down freely allowing fuel to enter the tank, but does not allow fuel to travel up the neck (under pressure). The plunger should be "up" (closed) in its free state.
IMPORTANT When working with the Fill Vent Valve and associated plumbing, be sure to replace the hoses into the proper hose clips to prevent fuel from getting trapped / puddled in the vapor hose. Return fuel from the liquid-vapor separator must have a clear path to drain back to the tank.
Special Notes:
(a) 1999 Sonatas have a Four Way Valve located between the liquid vapor separator and fuel tank.. The Four Way Valve provides an additional vapor path to the canister during refueling.
Proper operation of the valve is as follows: Air flows freely in either direction through the 1/2" ports. Air flows freely in either direction through the 1/4" ports. Air flows from 1/2" port to the 1/4" port when blowing into one of the 1/2" ports while plugging the other 1/2" port. Air does not flow from 1/4" port to the 1/2" port when blowing into one of the 1/4" ports while plugging the other 1/4" port
(B) Also NOTE that 1999 Accents have two (2) liquid vapor separators: one located on top of the fuel tank, the other located alongside the filler neck.
© Also note that one owner had a novel, no-cost solution. You can give it a try before investing in the long-term solution. Here is his feedback: “I have the same type of quirkiness on my 01' Elantra. My fix was to fill up when the gas needle is at the half way mark rather then when it's on empty. I was told by an attendant that fumes can build up in the tank and the pressure can cause the gas nozzle to pop out. I was guilty of driving around on near empty then only filling up but since I started filling up it up when the needle is at the half way mark the problem went away. You may have to do this a couple of times before the problem goes away.”
I had this problem for about a year and 1/2 - very frustrating. Recently it just miraculously resolved itself and is receiving fuel perfectly well now. About the same time it fixed itself, my check engine light came on! It went of for a few days after I re-adjusted the gascap, but is now on again and from I read inother posts, I will need to head to the dealer for a permanant expensive fix :-(.
I have had this problem on and off during the past 2 years. Actually, I had it happen last night when I was refueling at a BP station. I put the nozzle in all the way until the rubber piece on the nozzle was being pushed up by the filler tube. It was cutting off instantly. I pulled the nozzle out and pushed it all the way back in and the same thing happened. I pulled the nozzle back out again and it caught onto something and stayed there, allowing me to refuel without cutting off. I think the other poster is correct in that you have to pull the nozzle out a quarter of the way in order to fill it up without cutting off.
I feel your frustration, as that same thing happened to me about a year ago at another station. I got so frustrated, that I started getting irritated at the nozzle and pulling it out and shoving it back into the filler tube. It took me about 5-10 minutes to fill the car up. I bet the people at that station thought I was topping off the tank and overflowing it.
I feel your frustration, as that same thing happened to me about a year ago at another station. I got so frustrated, that I started getting irritated at the nozzle and pulling it out and shoving it back into the filler tube. It took me about 5-10 minutes to fill the car up. I bet the people at that station thought I was topping off the tank and overflowing it.
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