I am having a problem filling my gas tank. When I am filling it the nozzle shuts off about five gallons short of a full tank. I have watched several EVAP videos so I am assuming the problem is either the solenoid, the purge valve, the charcoal cannister (there are two) or a clogged line. No video shows a Ford with two canisters. On mine, they sit side by side. The one closest to the engine has two lines to it. The smaller line is steel until about six inches before it reaches the cannister and then it’s rubber. The second larger line is all rubber. The two cannisters are connected by one rubber line, the same size as the larger line in the first cannister. There is a round cap on top of the second cannister so nothing flows beyond it. The two cannisters look the same except for the connections on top. Is the second cannister an additional reservoir for storing hydrocarbons? Any suggestions as to where I should start troubleshooting?
1990 Ford E350 Econoline 460 7.5 liter EVAP issue
- Thread starter Dffraser
- Start date
KULTULZ
Well-known member
Yes the 2nd is added capacity and the DIAGNOSTIC SEQUENCE will be found in the appropriate year SHOP MANUAL.
rotorwrench
Well-known member
This site may be a better place to ask. https://www.ford-trucks.com/forums/1055650-cant-fill-gas-tank-pleading-for-help.html
The gas station nozzles are very sensitive to any type of back flow into them. If the filler pipe/hose has a blockage problem of some type, it won't allow correct flow to the tank. If the venting system doesn't open up after the truck's electricals are turned off, it may have the same affect. I have factory manuals for all my Ford vehicles so I can understand how it all works together but I don't have any manuals that would help in your situation. If the EVAP system stays isolated all the time then the venting should be provided in the filler pipe for when the fill cap is removed to allow for adequate venting during the filling process. Some designs are better than others in this respect.
The gas station nozzles are very sensitive to any type of back flow into them. If the filler pipe/hose has a blockage problem of some type, it won't allow correct flow to the tank. If the venting system doesn't open up after the truck's electricals are turned off, it may have the same affect. I have factory manuals for all my Ford vehicles so I can understand how it all works together but I don't have any manuals that would help in your situation. If the EVAP system stays isolated all the time then the venting should be provided in the filler pipe for when the fill cap is removed to allow for adequate venting during the filling process. Some designs are better than others in this respect.
Rotor Wrench is correct, it is the design of the fill tube and fill tube vent. They leave enough airspace in the tank for expansion extremes. Since the Pinto's were blowing up the fill tubes extend into the tanks further to prevent fill pipe pull out on impact. Some cars are worse than others. There is no way the small evap vent hoses can handle the escaping air from a gas pump that's pumping 5 gallons per minute. I had a 95 F-350 dually and spent what seemed like half my vacation trying to fill that pig up. If you pumped it fast it puked and you only ended up with 3/4 tank. Seemed to me the 80's and 90's Ford trucks had very small fill tubes compared to earlier models. Best of luck.
Thanks to each of you. After reading your posts, Indid a careful inspection of the main gas fill tube. There was a small crimp where it turns and enters the tank. I bought a few round clamps and positioned them so that the fill tube took on more of its natural shape when I tightened the clamps. I then tried to fill the tank. I am certain the amount of gas went beyond the level Inwas able to get it earlier but the gas gauge was not totally on the right marker of the gas gauge indicating the tank was completely full. I will look for the diagnostic sequence for testing the EVAP system. The two cannisters should come out without two much difficulty. I will need to get more informed on how best to test and, if necessary, remove and replace the purge valve and solenoid valve. Thanks again for taking the time to respond. Much appreciated.
KULTULZ
Well-known member
The reference to the FTE site above is going to be your best bet until you can find the correct year SHOP MANUAL SET (published by HELMS) for your year truck (find used on EvilBay). Most of what you will need will be found there.
There is a poster there (FTE) NUMBER DUMMY that can give you all your needed service part numbers as you will find most everything obsolete and needed to be found NOS on EvilBay and/or NOS sellers..
You will need your VIN and EMISSIONS CALIBRATION CODE to access the MPC properly.
You have to go through the DIAGNOSTIC SEQUENCE step by step to find the problem(s). Some important info may be contained in period TSB's which can usually be found on the net.
EVAP also needs servicing on a regular basis which is seldom done until a failure is experienced.
The carbon canister(s) you are describing need to replaced only if they become saturated by fumes and there will usually be a failure in the system to get that far,
If you try to diagnose by others descriptions/what they found on their trucks will only leave you chasing your tail and costing $$$ IMO.
There is a poster there (FTE) NUMBER DUMMY that can give you all your needed service part numbers as you will find most everything obsolete and needed to be found NOS on EvilBay and/or NOS sellers..
You will need your VIN and EMISSIONS CALIBRATION CODE to access the MPC properly.
You have to go through the DIAGNOSTIC SEQUENCE step by step to find the problem(s). Some important info may be contained in period TSB's which can usually be found on the net.
EVAP also needs servicing on a regular basis which is seldom done until a failure is experienced.
The carbon canister(s) you are describing need to replaced only if they become saturated by fumes and there will usually be a failure in the system to get that far,
If you try to diagnose by others descriptions/what they found on their trucks will only leave you chasing your tail and costing $$$ IMO.
rotorwrench
Well-known member
I helped a friend with a 1999 Ranger replace EVAP purge valve & other line components so it would seal & work properly and he had to get aftermarket stuff. The OEM stuff was out there on the flea-pay but the prices were ridiculous. It worked well enough that the check engine light quit coming on so it must have sealed it back up. So far so good. His didn't affect the fuel fill procedure at all. Vacuum leakage in the system or a bad purge valve is the most common problem with those systems but I have doubts about whether it will help much in the filling procedure in your case. Vans had some strange components to get the stuff to fit in tight spaces so it may just be due to that but I don't know. It should have had a vent tube in the filler assembly that went down into the top of the fuel tank. This way it would seal off the system when the fuel cap is reinstalled and the EVAP system could do its job dealing with the fuel vapors and venting the system while the engine is running.
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