Has anyone else had this problem? I have a new to me 2005 e150. The owners manual says "it is about 35 gallons." lol. Anyway, every time I go to fill it up the pump will kick off early, even if a slow down the pump rate. Every time it will still take another 5-7 gallons, if I slow the the pump rate down to a trickle, I can get it to fill. I'm thinking a clogged or damaged vent tube. Has anyone else experienced this, if so what was the solution?

Thanks

 

If in the habit of filling the tank to the very top, that forces liquid into the vapor recovery system and destroys the charcoal canister that is intended to hold VAPOR ONLY.
This causes charcoal granules into the vapor lines and now they need to be cleaned out.because the vapor can't get out via the vapor recovery and vent system..

This should be checked by someone that is knowledgeable regarding emission systems. There are purge and vent valves involved. There were also some problems with internal baffles inside the fuel tank and service bulletins should be checked also.

 

Yeah, I'm looking into the TSBs currently.
What I'm finding a bit confusing though, is that the pump nozzle is tripped off by fuel triggering it's own vent tube, not vapor. So the evap system should, logical to me, separate issue.

As far as I understand it, the evap system is for venting the tank when the cap is on, it's an EPA thing...and shouldn't affect filling (?).

 

One of the functions of the Evap system is to capture the gasoline vapor when refueling, so it cannot go out into the atmosphere.. When the fuel goes in, it displaces air in the fuel tank. That air contains fuel vapor and goes to the charcoal canister to be burned later when certain conditions are met. If that pressure cannot be relieved to the canister , it forces fuel backup the filler neck and causes the nozzle to shut off..
A thorough understanding of the system and how it is supposed to function gets a little complicated and should be serviced by a shop with that necessary knowledge.
Certain tests are done to determine if the lines , valves , filler neck or tank are at fault.I would have to type out pages to attempt to explain all this.

Maybe our good friend, heiko, might be able to offer a site where all this gets explained.

 

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Thank You, heiko,
I appreciate your help and your info has helped a lot of us here..