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Old 04-27-2014, 19:24   #1 (permalink)
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confused Fuel Tank Pressure Sensor?

Greetings everyone, I've got an issue with my 2010 Flex that my Google-Fu isn't getting results for. Starting last fall, it's been getting increasingly difficult to fuel up the Flex. It started with the pump clicking off after about 2 gallons, and now I have to hold the nozzle open as little as possible, and it takes 10 minutes to squeeze in $25 of fuel. I'm not picking up any trouble codes with the scanner, and no MILs lit up. I've been told by an old acquaintance that it could be the fuel tank pressure sensor, but I've not had any luck in getting any information on this part... plus, if it were out of range or malfunctioning, shouldn't it give a trouble code? I was thinking more along the lines that it could be something to do with the Evap canister or solenoid. Has anyone else had this issue? I'm being told that it's not central to any particular model, but the common thread is the Easy Fuel system. I'm at a loss where to even begin, and any help is definitely appreciated. Thanks in advance.
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Old 04-28-2014, 13:25   #2 (permalink)
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Re: Fuel Tank Pressure Sensor?

Some info here on that problem ,

Symptom Chart Condition Possible Sources Action
Slow to fill
Fuel tank filler pipe
Fuel tank filler pipe vent tube, if equipped
Evaporative Emission (EVAP) system
Fuel tank inlet check valve (part of the fuel tank)
Fuel level vent valve (part of the FP module)
GO to Pinpoint Test A.
All other fuel system concerns
Fuel system components
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
Pinpoint Test
Pinpoint Test A: Slow to Fill
Normal Operation
Under normal operation, fuel should flow at a steady rate through the fuel tank filler pipe into the fuel tank. As fuel enters the fuel tank, air is vented through the filler pipe or the On-Board Refueling Vapor Recovery (ORVR) system.
This pinpoint test is intended to diagnose the following:

Fuel tank filler pipe vent tube, if equipped
Fuel tank filler pipe
Evaporative Emission (EVAP) system
Fuel tank inlet check valve (part of the fuel tank)
Fuel level vent valve, if equipped (part of the Fuel Pump (FP) module)
PINPOINT TEST A : SLOW TO FILL A1 CARRY OUT INSPECTION AND VERIFICATION
Carry out Inspection and Verification.

Was the cause of the concern found?

Yes REPAIR or INSTALL new components to correct the concern. No GO to A2.

A2 CHECK THE SYSTEM FOR ANY EVAP DTCs
Connect the scan tool.
Check the system for any of the following EVAP DTCs: P0446, P0451, P0452, P0453, P0454, P1450, P1451 and P260F.

Are any of these DTCs present?

Yes REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual to diagnose the EVAP system. No GO to A3.

A3 MONITOR THE FTP WHILE FILLING THE FUEL TANK
Monitor the Fuel Tank Pressure (FTP) reference value while filling the fuel tank. Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

Is FTP within specification?

Yes GO to A5. No GO to A4.

A4 MONITOR THE FTP WHILE FILLING THE FUEL TANK WITH THE EVAP SYSTEM DISCONNECTED
Disconnect the fuel tank-to-EVAP canister quick connect coupling at the EVAP canister.
Monitor the FTP reference value while filling the fuel tank. Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

Is FTP within specification?

Yes INSPECT the EVAP system for blockage or restrictions. REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL new EVAP system components. No GO to A5.

A5 CHECK THE FUEL TANK FILLER PIPE ASSEMBLY FOR BLOCKAGE OR RESTRICTION
Remove the fuel tank filler pipe assembly. Refer to Section 310-01.
Inspect the fuel tank filler pipe and fuel tank filler pipe vent tube (if equipped) for a blockage or restriction.

Is the fuel tank filler pipe or fuel tank filler pipe vent tube (if equipped) blocked or restricted?

Yes If possible, REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL a new fuel tank filler pipe or fuel tank filler pipe vent tube. No GO to A6.

A6 CHECK THE FUEL TANK INLET CHECK VALVE
Inspect the fuel tank inlet check valve for restriction or sticking.

Is the fuel tank inlet check valve restricted or sticking?

Yes If possible, REPAIR the restrictions. If the restriction cannot be repaired, INSTALL a new fuel tank. REFER to Section 310-01. No GO to A7.

A7 CHECK TO MAKE SURE THE FUEL LEVEL VENT VALVE IS FUNCTIONING CORRECTLY
Remove the FP module. Refer to Section 310-01.
Inspect the fuel level vent valve for foreign material at the bottom of the drain hole.
Invert the FP module. Watch for movement and a click noise.

Was a movement/click noise witnessed?

Yes Fuel level vent valve is OK. RETEST the system for normal operation. No INSTALL a new FP module. REFER to Section 310-01.
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Old 04-28-2014, 16:31   #3 (permalink)
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Re: Fuel Tank Pressure Sensor?

Wow. So much good information in there. Gonna start with monitoring FTP while attempting to fill, and disconnecting evap. Thank you Sir!



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Old 04-29-2014, 09:57   #4 (permalink)
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Re: Fuel Tank Pressure Sensor?

Glad to help , let forum know how you get on ?
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Old 04-30-2014, 20:10   #5 (permalink)
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confused Re: Fuel Tank Pressure Sensor?

Okay, so I can't seem to pinpoint which value is the fuel tank pressure. I'm using an Innova 3160D Scan tool... is this not sufficient?
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Old 05-02-2014, 10:32   #6 (permalink)
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Re: Fuel Tank Pressure Sensor?

I don't think the fuel tank pressure sensor can give a hard to fill condition. I would start by inspecting the hoses under the vehicle. Especially the hose from the canister vent solenoid to wherever it vents. Disconnect it and make sure it's free of debris. Seen them I the past with spider webs that actually block the airflow enough. Never sets evap codes because it's able to vent enough during a evap test but not the volume when filling the tank.


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Old 05-02-2014, 10:37   #7 (permalink)
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Re: Fuel Tank Pressure Sensor?

^x2 Read about the spiders web also .
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Old 05-02-2014, 10:49   #8 (permalink)
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Re: Fuel Tank Pressure Sensor?

I thought about checking that after my buddies car got recalled for the spider issue. As for the FTP sensor, I just wanted to see what the difference in pressure is, but it's not a deal breaker. I'll definitely check the aforementioned hoses though. Thanks guys!

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Old 05-02-2014, 17:17   #9 (permalink)
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Re: Fuel Tank Pressure Sensor?

Soooooo, where in the world is the evap canister on this monster? I can't find squat under this thing. Can we bring back the 4bbl!?

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Old 05-03-2014, 09:07   #10 (permalink)
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Re: Fuel Tank Pressure Sensor?

Yeah... that'd be nice. Anyway, try the top of the tank.
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