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1991 E-150 Front fuel tank overflows while running on the…

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1991 E-150 Front fuel tank...
1991 E-150 Front fuel tank overflows while running on the rear tank. front tank gauge does not work but will run if front is selected on the switch. What needs replaced? Hank
Submitted: 1 month ago.Category: Ford
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Answered in 9 minutes by:
3/13/2018
Ford Mechanic: Edward, ASE Certified Technician replied 1 month ago
Edward
Edward, ASE Certified Technician
Category: Ford
Satisfied Customers: 3,567
Experience: ASE certified. Auto Transmission rebuilder for Ford Motor Co. from 91 to 2000
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Hello and thanks for your question. My name is ***** ***** I will do all I can to help.

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Ford Mechanic: Edward, ASE Certified Technician replied 1 month ago

The check valve has failed in the front fuel pump. My advice would be to replace the front fuel pump module. It comes with a new sending unit as well, so you can kill two bird with one stone there most likely with the fuel gauge sending unit problem. Don't put an Airtex in it. I would go motorcraft or Delphi, Delphi works good in my van and it's a 94. I had no problems with it, been in there a couple years. Let us know if you have any further questions. Thank you.

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Customer reply replied 1 month ago
WRONG! I had a new unit put in. The gauge now works but the tank still fills up while driving on the rear. $200 and I still have the problem.
Ford Mechanic: Edward, ASE Certified Technician replied 1 month ago
Could be tank selector valve. But I've fixed them before by replacing the pump. Sorry about that. I'll opt out in case another expert has another suggestion.
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Ford Mechanic: Ron, ASE Certified Technician replied 1 month ago
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 37,769
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Different expert here, are you still needing help with this?

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Customer reply replied 1 month ago
It seems like you guys are "JUST GUESSING"!
Ford Mechanic: Ron, ASE Certified Technician replied 1 month ago

Actually, I am not and I can tell you what the problem is that you're having with the fuel return returning to the wrong tank. It's not a bad pump. Ford had a recall for this problem and your 1991 E 150 was part of the recall. The problem is caused by a failing fuel tank selector valve. See the recall in the link below as this is the cause of the problem you are having.

https://www.dropbox.com/s/lo3z1wquoxwy6vv/selector%20valve%20Mar%2021.pdf?dl=0

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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 37,769
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