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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

my mystery gas tank

 
  #1  
Old 03-01-2011, 05:37 AM
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jejdavis
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my mystery gas tank

In my 94 the front fuel pump was shot when the truck was bought. I have not changed it yet. I've just been running around on the back tank. The front tank was full so I filled up the back tank one day with it. Now the front tank is full again and spilling out of the filler neck
Do I have a magic gas tank? If so I'll do the fuel pump in the snow tomorrow! Can it be slowely sucking gas from the back tank somehow?
Let me know what ya guys think.
 
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Old 03-01-2011, 06:57 AM
sg1099
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sound like the selector valve that switches between tanks is stuck between the tanks.find that ,tap on it and spray some WD-40 ont it . hopefully that will do the trick.
 
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Old 03-01-2011, 07:12 AM
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Would that be located just on the frame somewhere?
 
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Old 03-01-2011, 07:58 AM
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your truck has fuel pump in each tank, and they share the same fuel line. when the rear tank is selected, the front pump is supposed to shut its return port, but it sounds like its stuck open, so the return from your rear tank is going into your front. i think you would need to change the pump to fix it.
 
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Old 03-01-2011, 08:27 AM
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That actually makes a lot of sense, thanks! What ever happened to changing mechanical fuel pumps in 3 minutes
 
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Old 03-01-2011, 11:54 AM
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you could have a bad check valve in your front tank. thatll create what people call cross flow. there was actually a recall out from ford for a faulty check valve. I think the recall was 12 years or 150,000 miles (which ever comes first) from the manufature date of your truck.
 
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Old 03-01-2011, 12:41 PM
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Old 03-01-2011, 09:12 PM
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needs a pump i have read so much about this on here it boggles the mind. cant wait to fix mine which is doing same thing, pump on order from ford, maybe later in the week it will get done.

jeff
 
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Old 03-01-2011, 10:18 PM
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One of my friends had a 94 with a 351 front tank quit on him same thing it would fill up an over flow. He didnt have the money to buy a new pump an fix that selector switch so i popped the line of front tank ended up threading a 5 inch bolt in to the line not an all thread i believe the bolt was a 3/8's im not exactly positve but. it kept it from filling up his front tank an leaking gas. Of course fixing it the proper way would be best but sometimes thats not an option.
 
 
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