OBS Fuel Filler Neck - Ford Powerstroke Diesel Forum
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Old 06-02-2014, 11:01 AM
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OBS Fuel Filler Neck

Has anyone been able to find a filler neck for the rear tank on an OBS 7.3L? I've searched far and wide and only see ones for gassers and have had no luck finding one for a diesel. Mine is rotted out and leaking. I'm assuming that I'm not the only one with this issue so I'm hoping someone on here can give me some advice on modding or making my own due to the lack of available parts.
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Old 06-02-2014, 11:30 AM
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Check the dealer or RockAuto. Otherwise, go to a big truck shop or reputable privately owned parts house that makes hydraulic hoses and fab one up yourself. Most any hose that's rated for hydraulic fluid or gasoline will work for diesel. Just find the right size.
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Old 06-02-2014, 11:36 AM
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Dealer numbers for the aft axle diesel fuel tank from build date 2/94 and up -
F4TZ9047G for the filler neck
FOTZ9034L for the metal fill pipe at the cap
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Old 06-02-2014, 12:05 PM
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For some reason, Ford calls the _hose_ (the rubber part) the "neck", and calls the _neck_ (the steel part) the "pipe". OP needs the metal part, presumably.

RockAuto didn't have it last time I checked, a year or so ago. I ended up repairing mine with epoxy. Bunch of rust holes behind the worm gear clamp ( metal-on-metal, another stoooopid Ford design). Epoxy repair, prime and paint, layer of bike innertube between the clamp and the pipe (to prevent it rusting again, hopefully), should outlast the truck.
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Old 06-04-2014, 04:16 PM
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Use a gas one and gut it out. You can even open it up so you can use the large nozzles at a diesel station.
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Old 06-04-2014, 04:21 PM
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Just checked NAPA prolink, we have them for the rear, gas, but as I said you probably could make it work if you have to.
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Old 06-04-2014, 05:35 PM
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Get a filler neck/tube from a gas truck. Open the neck up with hole saw/die grinder/step bit or whatever you have. Clean out the filings throughly.

Do not cut the inner fill tube from the filler neck, you will get nasty spitback issues when filling if it is cut/removed.
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Old 06-05-2014, 04:31 AM
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NAPA FN725. We have them is stock so they should be available at your local NAPA store.
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