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Old 06-08-2012, 07:46 PM   #1
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Code: po455 ?

Once buying my mustang last year I've had a few issues. Mostly minor. But recently this code (po455) has popped up and I'm certain it's due to a gas leak. Yesterday I noticed there is a leak where the gas tank meets the nozzle tube area( I'm not a mechanic so I'm not sure of the technical term for that) but I think I've had that replaced once already.... Is there something I can do to prevent this?
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Old 06-09-2012, 12:21 PM   #2
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Re: Code: po455 ?

That code is due to a large evap leak and has nothing to do with the seal or ring where the filler neck goes into the tank. If you look to the left of the gas tank up in the fender kinda you wil see the EVAP canister. Most of the time there is a cracked rubber hose on the canister. Start look there after you replaced the gas cap is 60% chance it is that, know problem. After you do this let me know what you find on the canister and if you see any cracked hoses.
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Old 06-11-2012, 06:28 AM   #3
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Well I will check that. But there is a leak where the tank meets the feed. And it seems to be rather large but it's only on the hose leading into the tank
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Old 06-11-2012, 07:08 AM   #4
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Re: Code: po455 ?

is it leaking where the filler neck goes into the tank?
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Old 06-11-2012, 07:18 AM   #5
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Yea that's where I see all the gas right where they connect
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Old 06-11-2012, 12:33 PM   #6
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Re: Code: po455 ?

Yeah thats not going to cause that code, but you will have to fix that leak though. There is a o-ring type gasket that you have to replace, but you have to drop the tank to do it. Its easy I have had to do alot of them on 99-04 mustang.

What is causing that code has something to with the gas vapors or EVAP. Which means gas cap, evap canister and etc. So that could be a hose cracked somewhere on the EVAP canister, gas cap not tight or seal cracked. Pull you gas cap off and look at the seal and see if it is crack, lets start there.
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Old 06-11-2012, 07:05 PM   #7
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Ok do the seal in the cap is fine. I'm not sure how to locate the EVAP canister
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Old 06-11-2012, 10:05 PM   #8
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Quote:
Originally Posted by Justaskin00
Ok do the seal in the cap is fine. I'm not sure how to locate the EVAP canister
The canister is hidden behind the right (passenger) wheel weld, rear towards the door.

1. Remove the wheel
2. Remove the splash shield. Evap canister should be visible. It a black box
3. check the hoses for wear. Some become powdery with age. Mine did (1997). Used to smell gas. Now I don't.
4. Replace the hoses all the way to the TB
5. There is a valve & sensor mid line. It has indicators showing direction of TB or flow direction. Reassemble accordingly.
6. Operate vehicle first by idling, increase idle and so on.
7. Use your sniffer (nose) and click for odor.
8. No gas odor? Drive a few miles, create engine load at operating temp, stop, keep idling, use your sniffer again (mine's sensitive). Hey, learning is fun.
Hope you get the gist of this. The valve I mentioned costs about $80 at NAPA. I have no idea about the can mister. If you must replace it go NAPA.

Best of luck.

---------- Post added at 11:05 PM ---------- Previous post was at 11:00 PM ----------

Sorry bout #7, I meant check for odor, not click. Using cell app.
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Old 06-12-2012, 02:02 AM   #9
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Re: Code: po455 ?

Quote:
Originally Posted by LAS97GT View Post
The canister is hidden behind the right (passenger) wheel weld, rear towards the door.

1. Remove the wheel
2. Remove the splash shield. Evap canister should be visible. It a black box
3. check the hoses for wear. Some become powdery with age. Mine did (1997). Used to smell gas. Now I don't.
4. Replace the hoses all the way to the TB
5. There is a valve & sensor mid line. It has indicators showing direction of TB or flow direction. Reassemble accordingly.
6. Operate vehicle first by idling, increase idle and so on.
7. Use your sniffer (nose) and click for odor.
8. No gas odor? Drive a few miles, create engine load at operating temp, stop, keep idling, use your sniffer again (mine's sensitive). Hey, learning is fun.
Hope you get the gist of this. The valve I mentioned costs about $80 at NAPA. I have no idea about the can mister. If you must replace it go NAPA.

Best of luck.

---------- Post added at 11:05 PM ---------- Previous post was at 11:00 PM ----------

Sorry bout #7, I meant check for odor, not click. Using cell app.
You can do all of that but you also can just reach it from underneath the car by crawling under it from the rear of the car so either way works.
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Old 06-12-2012, 07:11 AM   #10
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Thanks guys I will check it sometime this week. Thanks for the info. I'll let you know how it goes onthis thread
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Old 08-03-2012, 03:34 PM   #11
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Re: Code: po455 ?

OK, so....I guess I'm not the only one with this problem. I know for a fact that I have a bad seal between the tank, and filler neck (smoke test) but haven't checked any thing else as mentioned here. (I will as soon as I get off this computer....) My question is could any of the above explain a rather annoying high speed miss that I get around 3500 RPM. It feels like it's starving for fuel. I have had no misfire codes, just our old friend PO455.....(HELP, It's street night at the local drag strip!)
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Old 08-03-2012, 06:11 PM   #12
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Quote:
Originally Posted by John Whyte
OK, so....I guess I'm not the only one with this problem. I know for a fact that I have a bad seal between the tank, and filler neck (smoke test) but haven't checked any thing else as mentioned here. (I will as soon as I get off this computer....) My question is could any of the above explain a rather annoying high speed miss that I get around 3500 RPM. It feels like it's starving for fuel. I have had no misfire codes, just our old friend PO455.....(HELP, It's street night at the local drag strip!)
I suppose it's possible if you have enough of a leak that your fuel pressure is lower than it should be when you at WOT.
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Old 08-03-2012, 06:33 PM   #13
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Re: Code: po455 ?

Quote:
Originally Posted by Azure View Post
I suppose it's possible if you have enough of a leak that your fuel pressure is lower than it should be when you at WOT.
Umm....Hate to sound dumb, (I am...) but what's WOT? I notice that first thing in the morning, when engine is cold, cold, it runs great. As soon as it gets up to temprature, all hell breaks loose....
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Old 08-03-2012, 06:48 PM   #14
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Quote:
Originally Posted by John Whyte
Umm....Hate to sound dumb, (I am...) but what's WOT? I notice that first thing in the morning, when engine is cold, cold, it runs great. As soon as it gets up to temprature, all hell breaks loose....
WOT means Wide open Throttle, slamming down the pedal. No question is dumb
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Old 08-03-2012, 07:03 PM   #15
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Re: Code: po455 ?

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WOT means Wide open Throttle, slamming down the pedal. No question is dumb
Cool....Makes sence. I'm also looking at the fuel pump, fuel pressure sensor and maybe even the MAF sensor.....Wadda you think?
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Old 08-03-2012, 07:16 PM   #16
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Quote:
Originally Posted by BigB227

...question is dumb
+1

---------- Post added at 08:15 PM ---------- Previous post was at 08:08 PM ----------

I'm thinking about how she's running when warmed up. Is your temp good, the temp gauge needle is just about pointing straight up?

---------- Post added at 08:16 PM ---------- Previous post was at 08:15 PM ----------

Quote:
Originally Posted by Azure

+1

---------- Post added at 08:15 PM ---------- Previous post was at 08:08 PM ----------

I'm thinking about how she's running when warmed up. Is your temp good, the temp gauge needle is just about pointing straight up?
Haha, sorry, meant to say NO question is dumb! Lol
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Old 08-03-2012, 07:24 PM   #17
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Re: Code: po455 ?

Pointing stright up.....New radiator, new heater core, cooling system is completely rebuilt.....(Thanks for your help...)
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Old 08-03-2012, 07:35 PM   #18
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I had the same evap code. My filler neck was completely rusted out. I replaced that with the new gasket and about 150 miles later the check engine light shut off.

---------- Post added at 08:35 PM ---------- Previous post was at 08:33 PM ----------

Quote:
Originally Posted by JCOB72
I had the same evap code. My filler neck was completely rusted out. I replaced that with the new gasket and about 150 miles later the check engine light shut off.
My car never had any performance issues. Just a big puddle under the car when I filled up!
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Old 08-03-2012, 07:39 PM   #19
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Quote:
Originally Posted by John Whyte
Pointing stright up.....New radiator, new heater core, cooling system is completely rebuilt.....(Thanks for your help...)
Is it really hot where your at? It could be heat soak if its in the mid 90's and up. Mine gets a boggy feeling when's it's like that outside.
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Old 08-03-2012, 07:45 PM   #20
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Re: Code: po455 ?

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Is it really hot where your at? It could be heat soak if its in the mid 90's and up. Mine gets a boggy feeling when's it's like that outside.
Yep, It's hot here in beautiful, downtown, Vacaville....But, (there's always a "but")...it does the same thing at night when it's in the 60's.....
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Old 08-03-2012, 07:59 PM   #21
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Quote:
Originally Posted by John Whyte
Yep, It's hot here in beautiful, downtown, Vacaville....But, (there's always a "but")...it does the same thing at night when it's in the 60's.....
What year is your ride? Here's some things to check...

COP (coil on plugs)
spark plugs
PCV valve
Check for vacuum leaks
Fuel filter
IAC (idle air control valve)
Throttle body, make sure it's clean
MAF as you mentioned

These are common items to check when she's running bad.
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Old 08-03-2012, 08:31 PM   #22
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Re: Code: po455 ?

As a matter of fact, it started doing this earlier this Spring when it was rather cool....

---------- Post added at 06:30 PM ---------- Previous post was at 06:10 PM ----------

Quote:
Originally Posted by Azure View Post
What year is your ride? Here's some things to check...

COP (coil on plugs)
spark plugs
PCV valve
Check for vacuum leaks
Fuel filter
IAC (idle air control valve)
Throttle body, make sure it's clean
MAF as you mentioned

These are common items to check when she's running bad.
98 GT convertable with upgraded "PI" heads and intake from newer GT.

---------- Post added at 06:31 PM ---------- Previous post was at 06:30 PM ----------

Quote:
Originally Posted by Azure View Post
What year is your ride? Here's some things to check...

COP (coil on plugs)
spark plugs
PCV valve
Check for vacuum leaks
Fuel filter
IAC (idle air control valve)
Throttle body, make sure it's clean
MAF as you mentioned

These are common items to check when she's running bad.
98 GT convertable with upgraded "PI" heads and intake from newer GT.
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Old 08-03-2012, 08:35 PM   #23
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If it was me, I would fix your leak and change your fuel filter. See how she runs after that just to make sure your not chasing multiple probs at the same time. The leak you have already figured out, and a dirty fuel filter, I would think could really drop fuel pressure.
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Old 08-03-2012, 08:59 PM   #24
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Re: Code: po455 ?

Already changed the filter. Don't want to drop the tank, fix the seal, and then find out it's the sensor, or fuel pump.....Jeez!
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Old 08-03-2012, 09:07 PM   #25
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Originally Posted by John Whyte
Already changed the filter. Don't want to drop the tank, fix the seal, and then find out it's the sensor, or fuel pump.....Jeez!
Understand that
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Old 08-03-2012, 09:26 PM   #26
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Re: Code: po455 ?

Quote:
Originally Posted by Azure View Post
Understand that
If it was your Mustang, what would be the first thing you'd do?
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Old 08-03-2012, 09:51 PM   #27
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I'd check the fuel pressure and see where it's at. Since you really need to fix fuel leaks for safety reasons, you need to drop the tank to fix your leak. While you got it down, there might be a test you can perform on the pump, but if you have a lot of miles, it might be better to replace it while the tanks down. Fix your known leak and button it up. Check your fuel pressure once your done, cause I think you can make adjustments to get it within spec. Then see how she runs. That's the course I'd take.
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Old 08-03-2012, 10:01 PM   #28
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Re: Code: po455 ?

Will do.....Next week, I have to work for a living, and that just doesn't fit into my time for building Mustangs! In the mean time, forget "Street Night" at the track for a while.....Darn! Thanks for your advise, I'll get back ASAP.....John
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Old 08-03-2012, 10:06 PM   #29
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Will do.....Next week, I have to work for a living, and that just doesn't fit into my time for building Mustangs! In the mean time, forget "Street Night" at the track for a while.....Darn! Thanks for your advise, I'll get back ASAP.....John
Right on! It's always helpful for everyone if you are able to give an update after you find time to work on your beast. Good luck!
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Old 08-04-2012, 09:31 PM   #30
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Re: Code: po455 ?

If you can see the leak thats definitly the problem,,your evap system goes into a vacuum test and that will fail the test and set that code
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Old 08-08-2012, 10:14 PM   #31
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Re: Code: po455 ?

Ok, soooo
I droped the tank (in my apartment parking lot....Manager was NOT happy!) changed out the fuel pump, replaced the grommet in the filler neck, changed out the pressure sensor, checked everything I could get my grubby hands on, slapped it all back together, and...(wait for it..) NO CHANGE! Still had the miss! &((%$#%&^&
One of my 15 year old students that I mentioned this problem to..(I teach kids how to drive for a living...) said "Uh, Dude, did you change the plugs?" Me: "No Dude, Todays cars aren't that simple.".... Well, just for the hell of it, I changed the plugs...Guess what? MISS IS GONE!!! Don't forget the simple stuff. Look at that first, then worry about all the computer stuff....Give me a 312 Y block and three Strombergs!
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Old 08-08-2012, 10:27 PM   #32
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Re: Code: po455 ?

Quote:
Originally Posted by Azure View Post
What year is your ride? Here's some things to check...

COP (coil on plugs)
spark plugs <---
PCV valve
Check for vacuum leaks
Fuel filter
IAC (idle air control valve)
Throttle body, make sure it's clean
MAF as you mentioned

These are common items to check when she's running bad.
I believe that was one of the things I thought would be good to check. Doh!

---------- Post added at 11:27 PM ---------- Previous post was at 11:26 PM ----------

At least you got it going

Doesn't always seem to be the little things?
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Old 08-08-2012, 11:48 PM   #33
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Re: Code: po455 ?

Yep, but who what have ever thought it was that simple.....I guess a 15 year old, and you! Good job! In any event, I'm a happy camper!
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Old 08-09-2012, 05:47 AM   #34
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Yep, but who what have ever thought it was that simple.....I guess a 15 year old, and you! Good job! In any event, I'm a happy camper!
Being happy, that's what matters. Glad you got her running right.
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Old 08-21-2012, 10:51 PM   #35
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Re: Code: po455 ?

Thanks for the info on where the canister is as I have that 0455 code too. l'll be changing the gas cap then if code comes back , I'll start checking canister.
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