Fuel tank mod now results in massive fuel spill at pump

[whiteboyslo]

So, like most, my truck struggles with taking fuel at the pump. It clicks off all the dang time unless you trickle it in. Rear tank is by far the worst.

A couple of weeks ago, after reading up on this some more, I decided to do the "mod" where you enlarge the vent hole using a Philips screwdriver and a mallet. Today was judgment day, and results are mixed. I started on the rear tank and, amazingly, the rear took the full blast, so much so that I set the tab to let it auto-fill and walked away to clean the windshield. Well, 6 gallons later, I hear it click off and then a huge splash. I come back around to about half a quart of fuel on the ground. I re-engaged the pump (because I'm smart), and it promptly re-did the same thing.

So now I have to replace the fill neck. Joy. Any idea where I went wrong? The front tank is fine, but the rear is just plain embarrassing at this point...

Mike

 

[Oledirtypearl86]

So it's spraying back out of the fill neck ?

 

[Clb]

Harpooning the tank???
the pipe in pipe cannot be enlarged with success to my knowledge

 

[whiteboyslo]

So it's spraying back out of the fill neck ?

Yep. Instead of the normal click with maybe an occasional trickle back at me, now I get a small flood.

Mike

 

[Oledirtypearl86]

Ok look at your vent you may have something that takes a bit of flow before you get it to block the vent my truck has a hose with 2 loops in it for he vent and every now and againe I will get a price of crap that blocks the flow and my truck will do that like exactly 6 to 7 gallons as soon as I clear it it's all good full bore fueling from then till next time