Unable to fuel completely

[Excaliburitto]

Good point.... Got me thinking about if I've been damaging my EVAP system . Based on some research it looks like the EVAP system (Mopar Part: 52029779AG I think) is located at the very top of the passenger side rear wheel well and comparing that to the height of the fuel filler I'd reckon its a good 4" or 5" higher than than you could ever possibly fill without gas coming out. Could it get pulled up there? Maybe, but so far with 20k miles using the techniques above I haven't had any warning lights or issues that I know of. It's good to know that the EVAP is super easy to get to if needed. You can also easily get to the fuel filler area through the driver's side taillight, that's where I installed my ARB compressor with the ARB quick connect coupling tucked up in the fuel fill housing. Here are some picks, thanks to Wayalife for the EVAP pic.
View attachment 40598

There should also be a small pump attached to the container. I never replaced it on a Jeep, but on other vehicles removing the whole enchilada is a pain in the butt.

Anyway, not sure how much gas overfilling really damages this or not, maybe it's just an old mechanic's story, but I thought it made sense and worth sharing.

 

[Earl 392]

I travel a lot with the 392 and I found that when I’m at a gas station that has level or a very slight rise toward the front my milage readout is around 325 miles , but other place that is inclined I can only get to 260-270 range or less.
I feel it’s more about air displacement inside the tank and since the air release is designed for us standing our jeeps straight up or down ,where a normal vehicle would stall out .
Try out filling up on different grades and find what pitch works best for you and let me know how it went .
Semper fi

Best I got was yesterday range 316 and was averaging 15.1 mpg at the time

 

[Turboencabulator]

Best I got was yesterday range 316 and was averaging 15.1 mpg at the time

This is probably the best range I've seen at 341 mi. Driving uphill (Florida to Ohio) on a hot summer day (94°) with Max A/C on full COLD , 2 parents in front with 3 young girls in the back along with ALL the luggage in the world (≈350 lb.). But at least all that hot air meant a lower air density = less fuel and wind resistance and with the SOT top and windows closed in 8th gear we were just rolling along down the highway at 1900 RPM. I reckon the extra "top up" fuel added another 15-20 mi. to the range.

 

[Bobo57]

I had this happen several times at pumps in Wyoming and Utah. Some pumps would just kick off repeatedly, long before the tank was full. Pulling the nozzle out of the Jeep a bit so that it was not all the way in solved it for me.

Many pumps I use click off prematurely, I usually have to angle the nozzle upward.

 

[Jeepstin392]

Had this happen on my GC SRT. Fuel vent valve and hose needed replacement. When this fails, it trips the fuel pump nozzle to receive pressure and kick off the nozzle.

 

[Mandrake]

Yeah the pitch of the 392 when fueling, makes it easy to fill all the way. If I can get the passenger side lower than the driver side, you can roll the gasoline in there!
The station where I fuel, ('Pure' brand gas) no alcohol, I can position the passenger side off the concrete pad, and its perfect. Even that crazy Gladiator is easier to fuel there.
The Gladiator has a problem where it likes to back up fill up the tube and spit it out before the pump feels the back pressure and cuts off. I have to listen to it fuel up and when I hear it backing up the fuel filler tube, you better cut it off quick., or you will have gas all over the fender flare , down the side on your hand, its a mess. A good sensitive pump it fuels pretty good.
Never had a issue in the 392 or my old TJ. But that Gladiator is finicky when it comes to fueling up.