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Old 10-02-2019, 08:23 AM   #1
Join Date: Jul 2015
Location: New Hampshire
Posts: 145
Year: 2001
Coachwork: Thomas
Chassis: MVP ER
Engine: Cat 3126b 210 HP 605 ftlbs
Slow draining fuel filler

I replaced my rusted tank with a plastic one and increased the total capacity from 60 gal to 100gal. My filler neck is 2'' and I used 6-7ft of 2'' hose to connect to the new tank. At the tank connection it necks down to 1.5 using a reducer. I have a 3/4'' vent line going back up to the top of the filler neck, the vent line connection on the tank may be a little small as I think is has a couple of 1/4'' holes in the tank part. I tried to fill the new tank yesterday and had slow drainage of the fuel form the filler neck, it took around 5-6 mins to get 10 gallons into the tank.. There is only around 6 inch drop from the filler neck to the opening the tank. Is there a certain slope that is needed or does the vent line at the tank need to be drilled out larger. Any help would be appreciated.

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