P1450 Error Code Excessive Fuel tank Vacuum - Ford F150 Forum - Community of Ford Truck Fans

Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > 2004 - 2008 Ford F150
Log In 

P1450 Error Code Excessive Fuel tank Vacuum

Thread Tools Search this Thread
Old 11-21-2011, 02:14 PM   #1
Junior Member
Join Date: Nov 2011
Posts: 14
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
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?
ahlbe1cl is offline   Reply With Quote
Join F150 Forum

Join F150Forum.com Today - It's Totally Free!

Are you a Ford F150 fan? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's a great place for Ford F150 Fans to meet online.
Once you join you'll be able to post messages, upload pictures of your truck, and have a great time with other Ford F150 fans. Whether your an old timer or just bought your F150 you'll find that F150Forum.com is a great community to join. Best of all it's totally free!

Join F150Forum.com Today! - Click Here JOIN FOR FREE

Old 11-21-2011, 03:29 PM   #2
5 Year Member
techrep's Avatar
Join Date: Jan 2009
Location: Va. Beach, VA.
Posts: 21,913
Thanked 693 Times in 623 Posts
Feedback Score: 1 reviews

Check your gas cap...
08 FX4... Flowmaster Exhaust, line-X, Sky Jacker leveling kit. 295/65/20 Nitto trails mounted on 20 X 9 Carol Shelby wheels. AIRAID CAI. Harley headlamps and LED Tails & 3rd brake lights,custom upper and lower Grill. Edge Evolution. Interior/Exterior LED lighting, NFAB step bars.
techrep is offline   Reply With Quote
Old 11-21-2011, 09:24 PM   #3
Certified Ford Technician
Join Date: Nov 2011
Location: Montana
Posts: 231
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews

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.
bleufox99 is offline   Reply With Quote
Old 12-07-2011, 12:54 AM   #4
Junior Member
Join Date: Nov 2011
Posts: 14
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews

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.
ahlbe1cl is offline   Reply With Quote
Old 01-09-2012, 07:07 PM   #5
Join Date: Jan 2012
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews

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.
ussoldier1984 is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
2010 Ford F150 intermittent crank no start tford55805 2009 - 2014 Ford F150 11 10-28-2015 05:43 PM
Rough Idle/Misfiring - HELP! (2006 F150 5.4L v8) carp104 2004 - 2008 Ford F150 19 10-14-2015 11:33 PM
Texas: 2012 F150 FX4 Ecoboost - Loaded OptimiStick 2009 - 2014 Truck Sales 2 10-07-2015 06:09 PM
4.9 Carb Fuel Guage Problem. Unique? 1986Ford4.9 General F150 Discussion 6 09-16-2015 06:37 PM
1991 Replacing fuel tank jdavis16 1987 - 1996 F150 6 09-16-2015 09:08 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 02:15 AM.

Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.