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Old 11-21-2011, 02:14 PM   #1
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Default P1450 Error Code Excessive Fuel tank Vacuum

I had a P1450 fuel code pop up the other day.

The key symptom of this is that the truck had a hard time starting after filling the tank.

I believe this has something to do with a solenoid on the vent line. Does anyone have experience with this?
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Old 11-21-2011, 03:29 PM   #2
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Check your gas cap...
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Old 11-21-2011, 09:24 PM   #3
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P1450 - Unable to Bleed Up Fuel Tank Vacuum

Description: Monitors the fuel vapor vacuum and pressure in the fuel tank. System failure occurs when the EVAP running loss monitor detects excessive fuel tank vacuum with the engine running (but not at idle). Possible Causes:
  • Blockages or kinks in the EVAP canister tube or EVAP canister purge outlet tube (between the fuel tank, EVAP the canister purge valve and the EVAP canister)
  • Fuel filler cap stuck closed (no vacuum relief)
  • Contaminated fuel vapor elbow on the EVAP canister
  • Restricted EVAP canister
  • CV solenoid stuck open (partially or fully)
  • Plugged CV solenoid filter
  • EVAP canister purge valve stuck open
  • VREF circuit open (harness near the fuel tank pressure [FTP] sensor, the FTP sensor or the powertrain control module [PCM])
  • Damaged FTP sensor
Diagnostic Aids: Visually inspect the EVAP canister inlet port, CV solenoid filter, and canister vent hose assembly for contamination or debris.
Check EVAP canister purge valve for vacuum leak.
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Old 12-07-2011, 12:54 AM   #4
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I dug into this further last night and removed the entire EVAP canister, solenoid, etc.

-All hoses looked good ( clear of kinks and dirt)
-Solenoid worked properly (used a 9v battery with alligator clips to make sure that it actuated properly.

There seems to be a "prefilter" which is a smaller rectangle box which sits on the drivers side of the evap assembly on the very top.

Mine was completely filled with dirt. I blew it out with an air hose. A ton of stuff came out.

The evap canister itself was also very dirty on the inside. I blew this out in both directions.

So far it worked. I filled up the truck with gas today and the truck did not hesistate to start. Every time I cranked the truck after buying gas, it would struggle to get fuel, but it seems okay now.

If anyone else is having this problem, I would start by blowing everything out and checking all hoses.
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Old 01-09-2012, 07:07 PM   #5
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I am having the same exact problem you had, everytime I put fuel in my truck hesitates to start and only when the tank is over 3/4 full It will throw the p1450 code. I have a 2008 f150 with 5.4 flex fuel engine. Can you maybe shoot a pic or explain better where the evap canister is so I can inspect mine? I suspect that that filter is probably clogged on mine as well. But the dealership said that the valve solenoid was stuck closed or open cant remember which.

Last edited by ussoldier1984; 01-09-2012 at 07:30 PM.
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Old 01-09-2012, 07:07 PM

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