thanks for the reply guys. the fill is dead vertical. i fill through the top of the seat on the console and it goes straight into the tank. there are no sags in the vent line, i fixed that prior to sealing the deck up. i have filled it to 3/4 before with no burping. i'll just try to fill it slow next time and see how that goes. i have emailed the builder to see if he can offer any intel. i'll let you know what i find at fillup at a different station.
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