They have a check valve at the far end of the filler neck. You have to run the pump slow to fill up. They are there to prevent gas sloshing up the neck and out of the cap vent when going down the road. Plus the filler neck has a very shallow angle that doesn't help either
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2019 Ram 3500 Limited w/ Max Tow pkg
2005 Cardinal 33LX
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3) SOLD!
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