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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 07-27-2009, 06:38 PM
jtm8571 jtm8571 is offline
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Question converting dual tank to single tank

I have a 94 f-150 single cab, it has the 302 with the dual tank set up, my back tank seems to be pumping fuel into my front tank as well as the fuel rail, after about 10 mintues it will have enough pressure to start pushing fuel passed the gas cap and out the side of the truck. not vapors, actually liquid fuel. i looked into it, and know that the switching valve could be not switching entirely, and that the one way check valves in the fuel lines could be shot. the problem is im on a students budget, so i dont have the money to spend, but i have the knowledge. i was wanting to convert it from a dual tank to a single tank system, does anyone know where i could find the parts or any instruction to somewhat follow? this is my daily driver, and i cant have it down for more then a night.

thanks for any help.
Jeremy

P.S. i can hear both front and back pumps turn on when i cycle the key.
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Old 07-27-2009, 06:42 PM
Neptoess Neptoess is offline
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you could just pull the relay for the rear fuel pump, and it won't pump anymore. Or you could bypass the switching valve entirely and just hook your front pump directly to your fuel rail
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1995 F-150 EB 302/4R70W rc lb 2wd 3.55s
-Sony Head Unit controlling 30 GB iPod
-Kenwood KAC-6202 200W RMS@2 Ohms into:
-Polk Audio 55W 6.5" front speakers
-Pioneer 50W 6x8 rears
-Kenwood KAC-6104D 300W RMS@2 Ohms into:
-Alpine Type S 10" Subwoofer mounted behind drivers seat
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Old 07-27-2009, 06:43 PM
bren_tx bren_tx is offline
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i have a similar problem. if i have the switch on rear it will over flow the front tank. but if i keep the switch on front, it will pump out of the front tank and somehow the rear will slowly front tank, so its almost like having a single tank and i really dont have any problems that way. its always funny to park the truck with a 1/4 tank of fuel in the front and then come out the next morning and its almost full
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Old 07-27-2009, 06:44 PM
Neptoess Neptoess is offline
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sounds like you've got some check valve problems bren
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1995 F-150 EB 302/4R70W rc lb 2wd 3.55s
-Sony Head Unit controlling 30 GB iPod
-Kenwood KAC-6202 200W RMS@2 Ohms into:
-Polk Audio 55W 6.5" front speakers
-Pioneer 50W 6x8 rears
-Kenwood KAC-6104D 300W RMS@2 Ohms into:
-Alpine Type S 10" Subwoofer mounted behind drivers seat
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Old 07-27-2009, 06:48 PM
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Conanski Conanski is offline
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Yeah you have the fuel tansfer problem. Your truck does not have the a switching valve just a pump module inside each tank. To disable a tank disconnect the power at the tank so you dont accidentally empty the contents on the ground and create a fire hazard, and find some studs like those in the pic below. A couple minutes with a hacksaw and grinder and you can turn them into plugs for the fuel lines, note you will need 2 different size studs for the send and return lines. Don't simply connect the 2 ends together or you'll create a fuel delivery problem with the other tank.

Click the image to open in full size.
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Paul (Conan) O'Brien

1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 07-27-2009, 06:53 PM
Neptoess Neptoess is offline
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conanski's idea is much more sound than mine. stick with his, i shoulda looked in my chiltons first to realize there is no selector valve
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1995 F-150 EB 302/4R70W rc lb 2wd 3.55s
-Sony Head Unit controlling 30 GB iPod
-Kenwood KAC-6202 200W RMS@2 Ohms into:
-Polk Audio 55W 6.5" front speakers
-Pioneer 50W 6x8 rears
-Kenwood KAC-6104D 300W RMS@2 Ohms into:
-Alpine Type S 10" Subwoofer mounted behind drivers seat
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Old 07-28-2009, 12:24 AM
bren_tx bren_tx is offline
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where are the check valves? are they in the diverter valve?
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Old 07-28-2009, 12:26 AM
Neptoess Neptoess is offline
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on tank filling the other tank
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1995 F-150 EB 302/4R70W rc lb 2wd 3.55s
-Sony Head Unit controlling 30 GB iPod
-Kenwood KAC-6202 200W RMS@2 Ohms into:
-Polk Audio 55W 6.5" front speakers
-Pioneer 50W 6x8 rears
-Kenwood KAC-6104D 300W RMS@2 Ohms into:
-Alpine Type S 10" Subwoofer mounted behind drivers seat
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Old 07-28-2009, 01:00 AM
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Alvin in AZ Alvin in AZ is offline
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http://www.stangler.com/motorsports/...alve/index.htm
Wow, cool old post by "Mustang 5.0" huh? :)

That thing sure seems overly complicated for what it does. :/

And this by Conanski...
http://farm4.static.flickr.com/3023/...f82e2acd71.jpg
Looks like something a guy should just make and have in the tool box, to me! :)

Alvin in AZ
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Old 07-28-2009, 01:00 AM
 
 
 
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