Recently pulled a code from my 2000 Exp. code is P1450, explanation was "Unable to bleed up fuel tank vacuum". Has any one seen this before and if so what is the fix.

Thanks in advance.

 

HX18 DTC P0446 OR P1450: CHECK FOR VISUAL CAUSES OF EXCESSIVE FUEL TANK VACUUM

Continuous Memory Diagnostic Trouble Code (DTC) P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum. Also, a DTC P0446 indicates a vent control malfunction.

Possible causes:

-- EVAP canister purge outlet tube (EVAP canister purge valve to EVAP canister) blockages or kinks.

-- EVAP canister tube (fuel tank to EVAP canister) blockages or kinks.

-- Fuel vapor elbow on EVAP canister contaminated.

-- Restricted EVAP canister.

-- Canister vent (CV) solenoid stuck closed (partially or fully).

-- Plugged or contaminated CV solenoid filter.

-- EVAP canister purge valve stuck open.

-- Fuel filler cap stuck closed (no vacuum relief).

-- VREF circuit open in fuel tank pressure (FTP) sensor.

-- Damaged FTP sensor.

NOTE:
If the EVAP canister-CV solenoid and fuel tank assemblies are not accessible to perform the following step, GO to the Powertrain/Engine Group, Evaporative Emissions Section in the Workshop Manual for removal procedures.

l Check for kinks or bends in the fuel vapor hoses/tubes (EVAP canister purge outlet tube and EVAP canister tube).

l Visually inspect EVAP canister inlet port, CV solenoid filter and canister vent hose assembly for contamination or debris.

l Check CV solenoid filter for blockage or contamination.

l Is a fault indicated?

Yes
REMOVE any contamination or debris around fuel vapor hoses/tubes and EVAP canister- CV solenoid assembly. REMOVE kinks or bends in EVAP canister purge outlet tube, EVAP canister tube and canister vent hose assembly. GO to «HX19».

No
GO to «HX19».

 

I have checked all of the lines, and have found no kinks or debris.

I have checked vacuum to the solenoid and there are no problems to that point.

Can I check the solenoid for proper operation?

Another goofy question, where is the canister?

 

BTT

Did you find the problem?
I have the same DTC on a 03 E-250. I've seen 30,000 copy/pastings of the FSM procedure and I have the FSM DVD.

 

And have you ever followed the procedure (exactly) to its conclusion?

If so, what was called out as the diagnosis?

If not, why not? There's no substitution for actually going through the process to find what works and what doesn't.

Steve

 

Yes I have looked it over and over and over. It just seemed like people copy and paste the procedure thinking it will solve the problem. I don't have a fancy rotunda evap tester doohickey so I couldn't run those tests. I did monitor EVAP PDC and FTP_V and it came out clean (voltage was 2.7V during 0% purge duty cycle). The van is a 2003 with 25k miles, no reason for any valve failures or debris/clogs in a sealed system. I visually examined all the hoses for kinks etc... and found nothing. If the hoses were leaky, I wouldn't hear a fart/burp from the gas cap. I just figured it was a common enough problem that there was a common denominator.

Short of just replacing the purge valve, vent solenoid, and the vapor valve, I'd just be doing exploratory surgery.

 

My check engine light came on this morning. I checked with Autozone for the code and pulled the P1450. My truck has been feeling as if it is missing, or misfiring over the last couple of months, but there have been no codes until this morning. Will this "Inability of Evaporative Emission Control System to Bleed Fuel Tank" cause any symptoms, or problems? I have a 99 f150 5.4L. Thanks for any info!

 

http://www.redpulsar.us/~coldfusion/P1450.html

A spider egg sac was the culprit in my 2003 E-250 (5.4L 2V V8). YMMV, but so far I've heard about 3-4 instances where a spider egg sac caused the P1450 code on trucks/vans.

 

2000 Expy
4.6L<O</O

I've just received the same P1450 code. I was planning a 500 mi. trip in the morning. Is this something I have to suspend my trip until it's fixed?<O</O

Dangers, or problems?

 

lol, thats f***ed up!!!

 

Nope. Unless you were planning on having an emissions test done on your trip....

The fault code is due soley to a malfunction in the evap emissions system. Purely emissions control only, not in any way related to either safety or drivability.

Enjoy your trip. Just ignore the light for the trip...

Steve

 

Thanks Steve! My son first duty station is at Eglin AFB and we are not going to miss this opportunity to see him. I will troubleshoot upon our return.

 

try searching that code number in Google for information

 

Code p1452 and p0452 put new gas cap on still when starting it act like it wants to die and it's surging at idle. What di I need to check

 

Wrong forum, you want the explorer forum, this is the expedition/navigator forum.