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Message: [QUOTE="jschildm, post: 571928, member: 1864"] I purchased the F-SuperDuty Roll Over Valve from someone on this site, as well as some modified filler necks to do the fast fill mod. I got it installed last week and filled up the rear tank for the first time today (front tank is still full). It worked great, and I was able to have the nozzle all the way on (granted it was a slow nozzle). However, it ended up clicking off and I saw fuel in the neck (or at least foam). It wasn't as much fuel as I thought it would hold, but figured I would call it good. When I got in the truck, it said that it was only 3/4 full. I know the back tank sits high enough that you have to be really careful with the breather hose routing. There might be a slight sag in it near the top of the filler neck, but not much. I am guessing some kind of sag is the problem, but it worked so well, and then acted full. Others that have done this, if you had a sag in the breather line, is this similar to your experiences? Thanks. [/QUOTE]

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