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Old 12-01-2011, 12:50 PM   #1
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EVAP issue plaguing Mustangs!

So, I can only fill up my tank 1/2 way anytime I try. And if the flow is coming out to fast, it clicks off before. I did some research and found this lengthy but very helpful bulletin on another forum (see below). I know several people personally who have had this issue. I called Ford Corp and they said I am the first person ever to tell them about it. Um... yeh.... They told me they will now start investigating to see how many customers have come in for the same issue. In the meantime, they recommended that anyone else who has had or is having the problem the call in and let them know. If enough people call in, there should be a refund for those of you who had the issue and had to have it fixed and a resolution for those of you , including myself who are still experiencing the issue. Please read below to see if this is something you are and had experienced and then give them a call! Please! 800-392-3673 And thank you!


I, like many others on this Forum, have been plagued with the dreaded fuel fill problem. Mine started from day 1 (the day I bought the GT, the dealership tried to fill tank and only got ½ tank filled… we all assumed it was their pump). I’ve had my GT for 18 months now (14K miles), and run into the fill issue about every 3rd or 4th fill-up. Each time I ran the tank down to the “50 mile” warning, and when filling, set pump at slowest fill speed. When issue does surface, I can only get ½ tank in before pump shuts off...and fuel is all the way up in the filler neck. I’ve even crawled under the car at station and tapped on the saddle tanks… finding the left saddle tank filled while the right saddle tank sound like the tin-man (empty). OK, now on to the news you can use. I took car in yesterday for the RCM Module (airbag) reflash. While there, I told them I’ve had it with the fuel fill issue. I was really impressed with the dealership as they really owned up to the problem (stating they had run into a number of these in the last 2 years) and methodically trouble-shot the problem. Here’s an excerpt of the work-order notes:

“Using IDS and ran EVAP test. Vehicle pass test. Tried to add gas and monitor fuel tank pressure. Started out at 2.6 volts then it jumped to 3.5 volts to HIGH. Disconnect each line one by one to check for blockage. Found Charcoal EVAP Canister plugged. Replaced Charcoal canister assembly. Retest OK. Also removed fuel filler neck and inspected, OK. Inspected check valve in fuel tank, OK.

Note to Customer: This vehicle is equipped with SADDLE style tank which has two sections. Vehicle will not fill up completely unless the tank is below ¼ tank and unless you are using the “autofill” function on pump on the lowest flow setting”.

So, based on their notes, it appears while they were measuring the pressure in the tank, they witnessed a voltage jump. Assuming this means it was requiring additional current to attempt to ‘fill’ or force air out of the right tank via the EVAP system… thus concluded there was a slight obstruction (a.k.a., charcoal EVAP canister). They added new EVAP canister assembly, and I’m happy to report that today, while nervously adding fuel, I was able to fill to 100% capacity!

They also stated that they eliminated other possible concerns such as:

•Fuel Filler Neck (visual inspection and performed adjustment)
•Fuel Vapor Control Valve (electronically tested and passed)
•EVAP Canister (failed and replaced)
•Fuel Tank Pressure (FTP) sensor: (electronically tested and passed)
•Canister Vent Solenoid: (replaced with the EVAP Canister)
•EVAP Canister Purge Valve: (electronically tested and passed)
It appears there are many potential failure points in the Evaporative Emissions system which could cause the saddle tank fill issue… in my particular case, looks like it was the EVAP Canister and/or Canister Vent Solenoid (both replaced). The Service Manager did share with me up front that these types of issues can be difficult to resolve as FORD requires test failure documentation before authorizing part replacements (under warranty). My hat’s off to Folsom Lake Ford as their Tech was able to produce this failure (blockage) through the tank pressure test.

Anyway, sorry for the dissertation, but wanted to provide this to those still plagued with the fuel fill issue. Perhaps your issue is also tied to a partially blocked EVAP Canister and/or intermittent Canister Vent Solenoid. I guess only time will tell if in fact this did fix my issue (as I’d feel better after a half dozen successful full tank fills at various stations). Hopefully, based on what they found, looks like this may have solved the Pony feed issue.

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Old 12-01-2011, 12:52 PM   #2
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Damn girl. Just saw the post on my FB wall and was going to tell you to post a thread about it here.


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Old 12-01-2011, 12:56 PM   #3
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Re: EVAP issue plaguing Mustangs!

Yeh... kind of frustrated. How can they not know about this? It's been going on for years with all years both v6 & 8s. It's their piss poor design of a fuel tank. Need we remind them that sometimes simple is better than complicated? They really need to own up to this issue.
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