Two-Fold Fuel System Issue
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Laughing Gas
Joined: Feb 2015
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Two-Fold Fuel System Issue
So, I'm back with a double head scratcher. The first part is I believe I am among those affected by the cross-filling tank condition. Went to my truck after school and noticed a small puddle of gas and a trickle of fluid coming from the midship filler cap. Seems as though the mid tank is being filled by the aft tank. I know there's a recall about this problem, something to do with replacing check valves, but where do I get the parts?
The other one is bad, too. I have an intermittent stumble/die when the mid pump is selected. Aft pump has never caused this condition, only the mid. I've been told by my go-to tech that the mid pump is drawing more current than the aft pump (7-8 amps). It doesn't always do it but seems to be happening more frequently. Does the pump need to be swapped?
For both issues, no codes, averaging 30-35 psi at the rail when engine is running and ~45 psi static.
The other one is bad, too. I have an intermittent stumble/die when the mid pump is selected. Aft pump has never caused this condition, only the mid. I've been told by my go-to tech that the mid pump is drawing more current than the aft pump (7-8 amps). It doesn't always do it but seems to be happening more frequently. Does the pump need to be swapped?
For both issues, no codes, averaging 30-35 psi at the rail when engine is running and ~45 psi static.
Lead Driver
Joined: Jul 2007
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From: Rhode Island
The fuel tank selector valve has failed, unfortunately. I believe Ford had a "band aid" fix that involved installing some check valves in the fuel lines, but it didn't really fix the actual problem.
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Laughing Gas
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So what is the actual fix for the problem? Are these check valves included in the pump itself for 1991 models?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
There is no tank selector valve on a '91 only check valves inside the Fuel Delivery Module inside each tank, and since you have a dodgy pump anyway you may as well replace the whole FDM.
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Laughing Gas
Joined: Feb 2015
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Perfect, that's what I wanted to know. More than likely if I get a new pump from Kragen the latest available design will account for any needed design changes? Can I just ignore the TSB about the external check valves or should they be installed?
FTE Legend
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From: Ottawa, Ontario
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Laughing Gas
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Lead Driver
Joined: Jul 2007
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From: Rhode Island
What was the final year for the tank selector valve? '90?
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