Fuel overflow when filling up.

[MightyMouse]

Yes....... I was surprised myself but when making an aux tank i accumulated a few cross over pipes ( petrol ) and noticed the difference. Don't know how much the bigger pipe changes the flow as I used the cross over pipes to make a Y piece but you'd suspect that the change was done for a reason.

Anyway..... an interesting and useful mod.

[Banshee]

There are actually service Bulletins that cover this under the US warranties, as well. 2 separate ones, probably because of the different size crossover pipes you found. I'm guessing the different size was used between 1/3/2007 & 31/3/2008

SERVICE BULLETIN NUMBER: 14-003-12
GROUP: Fuel System
DATE: May 25, 2012
SUBJECT:
Fuel Spit Back During Refueling (X32 Warranty Extension Unlimited Time And Mileage)
OVERVIEW:
This bulletin involves replacing the fuel tube at the fuel tank. This new fuel tube has a
check valve.
MODELS:
2007 - 2008 (JK) Wrangler
NOTE: This Extended Warranty Bulletin applies to vehicles equipped with a 3.8L
engine (sales code EGT) built between March 1, 2007 (MDH0301XX) and
March 31, 2008 (MDH 0331XX).
SYMPTOM/CONDITION:
Some customers may experience a fuel spit back condition during a refueling event.

SERVICE BULLETIN NUMBER: 14-001-13
GROUP: Fuel System
DATE: January 30, 2013
SUBJECT:
Fuel Spit Back During Refueling (X47 Lifetime Warranty Extension)
OVERVIEW:
This bulletin involves replacing the fuel tube at the fuel tank. This new fuel tube has a
check valve.
MODELS:
2007 - 2008 (JK) Wrangler
NOTE: This Extended Warranty Bulletin applies to vehicles equipped with a 3.8L
engine (sales code EGT) built before March 1, 2007 (MDH0301XX) and after
March 31, 2008 (MDH 0331XX).
SYMPTOM/CONDITION:
Some customers may experience a fuel spit back condition during a refueling event.

[Banshee]

Update. Filled it up last night.

Against 3 years of habit, I forced myself to keep it going flat out until it cicked off. That is when it would typically splash back &, if I had not at least slowed a bit, splash out on me as well as the side of the JK.

Nothing. Not a drop of overflow. It was also almost completely full & took very little more from that single click off. Previously, it would take several litres after the first click, even when I had slowed down enough that it didn't splash out.

A solid win for less than a full tank of fuel, (at today's cost...).