Difficult to fill fuel tank. Fuel pump shuts off constantly as if the tank is full. Fuel tank is nearly empty. Believe problem in vapor canister system.

Is the vent valve operating correctly? Sounds like it might be stuck shut. And are your replacement parts quality? Alot of times cheap parts aren't worth buying.

Year make and model would be nice to know but in most cases it is caused from over-filling the fuel tank. On modern cars there is a vapor canister line that vents to a charcoal canister for emission control and if you TOP OFF the tank by squeezing in fuel after the nozzle on the pump shuts off, you over fill the tank and cause liquid to go to the canister.

I came across this service bulletin that you will find helpful- I do believe the VCF is above the fuel tank; but if you call any diy auto parts store like NAPA, AutoZone, Pep Boys, etc.or even the parts department at Dodge, for pricing, they'll tell you exactly where it is located and they may even print out the schematic for you. Best wishes on your project. BTW, did you're "check engine" light go on? Did you get an OBD-II fault reading? Or fail an emissions test? Just curious for my own knowledge.


THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 14-001-09, DATED
APRIL 15, 2009, WHICH SHOULD BE REMOVED FROM YOUR FILES. THIS IS A
COMPLETE REVISION AND NO ASTERISKS HAVE BEEN USED TO HIGHLIGHT
REVISIONS. SUBJECT: Hard To Fill With Fuel Or Fuel Nozzle Shuts Off Repeatedly MODELS: 2004 -2008 (CS) Pacifica
2009 (DS) Ram Truck (1500)
2007 - 2009 (DH) Ram Truck (1500/2500 Pick Up)
2004 - 2009 (DR) Ram Truck (1500 / 2500 Pick Up)
2005 - 2009 (HB) Durango
2007 - 2009 (HG) Aspen
2005 - 2009 (ND) Dakota
2009 (JC) Journey
2007 - 2009 (JK) Wrangler
2007 - 2009 (J1) Sebring (China CKD)
2007 - 2009 (JS) Sebring/Sebring Convertible/Avenger
2006 - 2009 (K1) Cherokee (CKD)
2007 - 2009 (KA) Nitro
2008 - 2009 (KK) Liberty
2008 - 2009 (KK) Cherokee (International Markets)
2005 - 2007 (KJ) Liberty
2005 - 2007 (KJ) Cherokee (International Markets)
2005 - 2009 (LE) 300C/300C Touring (International Markets)
2005 - 2009 (LX) 300/Magnum/Charger
2007 (L2) 300 (China)
2008 - 2009 (LC) Challenger
2004 - 2009 (PT) Chrysler PT Cruiser NUMBER: 14-001-09 REV. A GROUP: Fuel DATE: September 1, 2009 2007 (R2) Caravan/Voyager (CKD)
2005 - 2007 (RG) Chrysler Voyager (International Markets)
2003 - 2007 (RS) Town & Country/Caravan/Voyager
2008 - 2009 (RT) Town & Country/Grand Caravan
2008 - 2009 (RT) Town & Country/Grand Voyager (International
Markets)
2005 - 2006 (TJ) Wrangler
2005 - 2009 (WH) Grand Cherokee (International Markets)
2005 - 2009 (WK) Grand Cherokee
2006 - 2009 (XH) Commander (International Markets)
2006 - 2009 (XK) Commander NOTE: This bulletin applies to all vehicles equipped with a gasoline engine.

DISCUSSION: Customer may report that the vehicle is hard to fill with fuel or that the fuel pump nozzle
shuts off repeatedly while trying to fill vehicle.
This customer complaint can occur due to a number of different causes. The fuel tank is
the least likely cause of this condition. The following Diagnostic procedure can be used to
diagnose the issues.

DIAGNOSIS: 1. Is the vehicle a LX/LE/LC/L2?
a. Yes >> proceed to Step #2
b. No >> proceed to Step #4
2. Idle the vehicle 60 to 90 seconds upon stopping.
3. Does tank refill properly?
a. No >> proceed to Step #4
b. Yes >> Inform the customer to idle the vehicle for 60 to 90 seconds upon stopping if
vehicle was driven aggressively. This is due to the fact that on the LX/LE/LC/L2 the
fuel tank is a unique saddle tank design and needs 30 to 60 seconds while the
engine is running to level the fuel in both half's of the fuel tank. Allowing the vehicle
to idle for this amount of time will let the fuel pump transfer fuel to the left side tank,
opening the control valve and allowing normal fuel filling.
4. Disconnect the vapor recirculation tube at the fuel tank.
5. Attempt to refill fuel tank.
6. Does tank refill properly?
a. Yes >> Proceed to Step #7
b. No>> Proceed to Step #11.
7. Reconnect the vapor recirculation tube at the fuel tank.
8. Disconnect the other end of the vapor recirculation tube at the fuel filler tube.
9. Attempt to refill fuel tank.
10. Does tank refill properly?
a. Yes >> Replace fuel filler tube.
b. No >> Replace the vapor recirculation tube.
11. Disconnect the control valve to EVAP canister tube at the fuel tank.
14-001-09 REV. A -2-
12. Reconnect the vapor recirculation tube at the fuel tank.
13. Does tank refill properly?
a. No >> Replace Fuel Tank.
b. Yes >> Proceed to Step #14.
14. Reconnect the control valve to EVAP canister tube at the fuel tank.
15. Disconnect the control valve to EVAP canister tube at the EVAP canister.
16. Attempt to refill fuel tank.
17. Does tank refill properly?
a. Yes >> Blockage is in the EVAP Canister, or ESIM, or Clean air hose (ESIM vent
hose), or filter. Diagnose appropriately.
b. No >> Replace the control valve to EVAP canister tube.

POLICY: Information Only
-3- 14-001-09 REV. A

If this is related to the fuel filling, evaporative canister issue, maybe the following will help. Most of the components for the fuel tank are located near the tank itself, with some near the front of the tank and the evaporative canister components behind the driver side rear wheel inside a splash cover.

The biggest problem people complain about is not being able to fill the tank without the pump stopping if the tank is filled at a higher rate than a trickle. This issue is caused by trying to overfill the tank after the fill nozzle has clicked off causing fuel to damage the evaporative charcoal canister clogging it and causing the blow back to the filler neck and fill nozzle, simulating a full tank shut-off of the filling process. This is not exclusive of Hyundai, and gas pumps usually warn of overfilling the fuel tank because of this known result. This evap containment mechanism was developed for the cars to replace the vapor collecting mechanism that gas stations used to use partly for the fill nozzle and collection dangers, now all that vapor is collected and safely burned when the engine is running. The evap canister can be expensive to replace, in the neighborhood of $150 from the dealer, and it's not recommended to try and bypass the system or you can create more issues than you solve.

Visit https://www.hyundaitechinfo.com/ to get service info for your vehicle, it's free and very useful.

If this isn't related to your issue, sorry, maybe you can post more info on what the issue is and how you need help.

Help trouble locating vapor canister vent valve on 2006 Lincoln Navigator 5.4L

EVAP System Vent?

Is the EVAP Canister, full of fuel

you have 2 recalls
pcm update fuel pump replacement
fuel pump module replacement and pcm software

The vent from the tank,to the fuel fill(small hose)is stopped up.

The ORVR (On-Board Refueling Vapor Recovery) system consists of a unique fuel tank, flow management valve, fluid control valve, one-way check valve and vapor canister.

The ORVR (On-Board Refueling Vapor Recovery) system is used to remove excess fuel tank vapors. This is done while the vehicle is being refueled..

Fuel flowing into the fuel filler tube (approx. 1 inches I.D.) creates an aspiration effect drawing air into the fuel fill tube. During refueling, the fuel tank is vented to the EVAP canister to capture escaping vapors. With air flowing into the filler tube, there are no fuel vapors escaping to the atmosphere. Once the refueling vapors are captured by the EVAP canister, the vehicle's computer controlled purge system draws vapor out of the canister for the engine to burn. The vapor flow is metered by the purge solenoid so that there is no, or minimal impact on driveability or tailpipe emissions.

As fuel starts to flow through the fuel fill tube, it opens the normally closed check valve and enters the fuel tank. Vapor or air is expelled from the tank through the control valve and on to the vapor canister. Vapor is absorbed in the EVAP canister until vapor flow in the lines stops. This stoppage occurs following fuel shut-off, or by having the fuel level in the tank rise high enough to close the control valve. This control valve contains a float that rises to seal the large diameter vent path to the EVAP canister. At this point in the refueling process, fuel tank pressure increases, the check valve closes (preventing liquid fuel from spiting back at the operator), and fuel then rises up the fuel filler tube to shut off the dispensing nozzle.