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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 01-27-2008, 10:38 AM   #1 (permalink)
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Fuel Tank Venting

Are the fuel tanks on 89 f350 vented anywhere? why or why not?
Thnks remote
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Old 01-27-2008, 10:48 AM   #2 (permalink)
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If they are like the 94-97 PSD's they are vented through the fill hose/fill neck. They use a hose within a hose. There is a soft sleeve type hose within the stiff outer hse. The fuel enters the tank thru the inner hose and the air vents thru the space between the two hoses.
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Old 01-29-2008, 09:29 PM   #4 (permalink)
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No problem filling, etc. The question is asked because of a problem I have posted on before and have not solved. When running on one tank the truck runs fine but when switched there seems to be I believe a fuel shortage after a period of time. Seems to get worse aS fuel is depleted in tank. Replaced both sending units at same time few months ago, Dont think problem can be there. I was wondering about venting becasue this is the F350 that I added flatbed body and used filler tubes that came with it, as best I remember. The flatbed body came off of wrecked chevy 1 ton. Problem I suspect is either Air in system when running on that particular tank or lack of air when running on that tank. I have checked for everthing to see if air is entering system. I dont know about venting and how that would affect this tank?
thnks , Remote
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1989 F-250 4x4 C-6 7.3
1989 F-250 4x4 C-6 7.3
1991 F-250 4x4 E-4OD 7.3
1989 F-350 4x4 5 speed manuel 7.3 (present project truck)
1989 F-350 4x4 E-4OD 7.3 (4 door) (future project)
John deere 450C Crawler
Ford 6610 4x4 Tractor
Diamond Rio Dump Truck
Chevy Dump Truck
International Semi
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Old 01-30-2008, 09:17 AM   #5 (permalink)
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Since you have a non stock filler without the vent tube, I'd bet that's your problem. Through the years I've actually seen a few of the old metal fuel tanks sucked down and collapsed from someone buying a non vented tank cap and using it. I'd buy a vented cap and see if that helps.
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