Common for the fill tube to be 1 1/2" diameter and vent tube to be 1/2" diameter. One small kink in the vent line and your going to have issues.
If you take the screws out that hold the fresh fill plate on, you should be able to pull it out far enough to check. I've done quite a few.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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