Slow Fueling: Last 5+/- gal

[wild01ride]

I searched and haven't found any related topics, so I'm going to ask about an issue that bugs the crap outta me w/ my '98 Mounty...

When I fill 'er up, the pump will always stop at around 16gal. At this time, I can hear the gas filling up into the filler neck, but then run back down into the tank. At this point, I can slowly trickle gas into the tank until the point where I can get as much as about 21gal. or so total into the tank.

What's the deal?

I imagine there's some problem with venting of the tank or something seeing as, once I hit the ~16gal. point, I can squeeze the handle normally and hear the gas fill the filler neck and then trip the pump and repeat this process until the full ~21gal. is reached.

Has anyone else had this problem or have a suggestion for what part of the fuel system is causing this annoying problem?

Thanks a bunch!

BTW:
'98 Mounty
5.0L / AWD

 

[MountaineerGreen]

Your fuel tank only holds ~21 gallons according to the specifications. I never put more than 16-18 gallons in mine, I always fill up at 1/4 tank or so. I don't know how you are able to get that much fuel in your tank unless you were near empty.

 

[badge49]

That's odd, I can get 20 gallons in (on a bone dry tank) before it cuts off at the pump. Maybe something is clogging the filler neck, only letting a little in at a time?