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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 04-06-2008, 08:40 PM   #1 (permalink)
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FSV problem

i have been having a problem since i put my truck on the road since restoration and am now just getting around to fixing it.

say i have a half a tank in the fron tank and i fill up the rear tank and run my truck on the rear tank.

after i shut it off for the night and come out and start it up switch it to the fron tank it reads full.

the valve switches back and forth perfectly but it seems to me that when switched to the rear tank the front doesnt seem to close and gravity fills the tank up over night.

any information as what to do and look for when im underneath would be greatly appreciated as this is one part of my truck i have no idea about.


thanks

JOSH
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Old 04-07-2008, 07:53 AM   #2 (permalink)
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Is your tank actually filling up or is you sending unit shot.
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Old 04-07-2008, 01:06 PM   #3 (permalink)
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my tank is actually filling up i thought that at first and checked but the tank is filling up for sure
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1988 F250 ext. cab dually 2WD 4.56 rear
7.3 W/ ATS Turbo kit, HEAD STUDS, ZF5 single mass flywheel, 12.5 clarck clutch, 6" stacks, mickey thompson supersingles for the summer time.
American flag paint
boost/pyro/oil temp/oil press


1986 f250 Lariat 4x4 6.9L c6 auto/285-75-16's/ brand new viper red paint with my own custom interior viper red and black to match body/front flare out fenders to match newer body style bed from a 95 (custom)
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Old 04-07-2008, 03:25 PM   #4 (permalink)
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You say this has only happened since restoration, is it a possibility that you might have gotten the plumbing mixed up?
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Old 04-07-2008, 03:53 PM   #5 (permalink)
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very well could have but it was never tampered with by me maybee the P/o so i cant rule it out
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1988 F250 ext. cab dually 2WD 4.56 rear
7.3 W/ ATS Turbo kit, HEAD STUDS, ZF5 single mass flywheel, 12.5 clarck clutch, 6" stacks, mickey thompson supersingles for the summer time.
American flag paint
boost/pyro/oil temp/oil press


1986 f250 Lariat 4x4 6.9L c6 auto/285-75-16's/ brand new viper red paint with my own custom interior viper red and black to match body/front flare out fenders to match newer body style bed from a 95 (custom)
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Old 04-07-2008, 06:36 PM   #6 (permalink)
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Is it possible your fuel selector valve isn't closing all the way. That might explain the siphon effect you are having.

If it were me, I would change the selector valve and rule that out. I think that's the only spot where the two tanks are connected. I wouldn't think your getting a siphon from your fuel return line, seeing how it has to go through the fuel pump and ip pump for that to happen.
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THE BLUE BOMBER! Currently Toast !!!!

87 ford f-350 cab-chassis dually. 2wd, 6.9, 3 speed C-6. 3 leaf helper springs, 11,000 gvwr, pintle/ball hitch, 6 pin round trailer connector (unhooked currently). Rear generic truck stop lights. Twin I beam front end with coil springs. Plow lights and switch to go from headlights to plow lights. 8.5 foot meyer diamond plow with central hydrolics. 8 foot rugby dump bed. 167,000 miles and still strong. Solid State Glow Plug Controller.

Last edited by WhiteGardens; 04-07-2008 at 06:41 PM.
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Old 04-07-2008, 08:44 PM   #7 (permalink)
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thats what im thinking that it isnt closing and becuse of this it fill up over night since the rear tank is higher.

i will just replace it but i cant find any new ones ford no longer carries them according to my local dealer

anyone know where i can get a new one

if not i can take one off my parts truck but would rather have a new one.
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1988 F250 ext. cab dually 2WD 4.56 rear
7.3 W/ ATS Turbo kit, HEAD STUDS, ZF5 single mass flywheel, 12.5 clarck clutch, 6" stacks, mickey thompson supersingles for the summer time.
American flag paint
boost/pyro/oil temp/oil press


1986 f250 Lariat 4x4 6.9L c6 auto/285-75-16's/ brand new viper red paint with my own custom interior viper red and black to match body/front flare out fenders to match newer body style bed from a 95 (custom)
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Old 04-07-2008, 09:13 PM   #8 (permalink)
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I don't know anything about the quality etc but here's one that's available: AutoZone.com | Shopping | Parts | Product Detail - Fuel Tank Selector Valve
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Old 04-07-2008, 10:12 PM   #9 (permalink)
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i have a used one out of an 87 f250 if you want it give me a pm
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Old 04-08-2008, 11:09 PM   #10 (permalink)
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Are the 86 and 87 FSV the same? I went to my dealership and they still had them, in fact they said they had one on the shelf. The FSV is the same as what they used for several years since (I'm not sure how long, but it was into the 90's) and they could still order them. I asked about both the FSV and the sending unit, as none of the auto parts stores listed them. I've seen universal FSVs, but they require a wiring adapter. I think the FSV would cost me $121 and the sending unit was $117 (with an employee discount... list price was around $160-180... our fleet mechanics at work are Ford-authorized mechanics and do a LOT of business with the dealership... our entire fleet are Fords.)
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Old 04-09-2008, 07:23 AM   #11 (permalink)
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The newer style FSV was for 88-97 but due to the 87 being a crossover year there may be a newer style on some trucks..... late builds maybe. If anyone does a replacement please post what you find that fits......with part numbers so I can stash that info........ thanks.
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