Swap 1999 Flex Fuel Sensor with a 2000 FFS - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 07-21-2017
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Swap 1999 Flex Fuel Sensor with a 2000 FFS

Hey, so I just bought my 1999 XLT 4x4 3.0 ranger. Its my first truck and I ran into an issue with the Flex Fuel Sensor. The previous owner installed some aftermarket sensor which fixes the issue, but doesn't allow for Flex Fuel. Now, I don't want or need Flex fuel but the after market part seems to just delay the real problem until down the road. I don't want to buy a 1999 flex fuel sensor online for over $500 and I found a salvage yard that'll sell me a FFS for $150. Only problem is is that it is a 2000.. Will I be able to swap these without trouble? Thanks
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Old 07-21-2017
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Yes, it should work fine, Ford used the same sensor from 1999 to 2003

The FF replicator is what you have now, tells computer you are running gasoline

Ford dropped these on most FF vehicles in favor of better computer software and wider band O2 sensors
You have to add more ethanol fuel than gasoline to the same amount of air to get the correct air/fuel ratio, and thats what O2 sensors tell the computer, not sure why they ever even used the flex fuel sensor
I guess Cold Start could be an issue but computer already has a memory that could/does, remember last long term fuel trims for cold starts

Last edited by RonD; 07-21-2017 at 04:21 PM.
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Old 07-22-2017
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Hey awesome. Thank you
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Old 07-23-2017
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How do I go about making sure there isn't any pressure in the fuel lines and emptying them so I can change out the sensor? Also, don't I need to have some way to press the lines into the new sensor?
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Old 07-23-2017
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Open engine fuse box, find the Fuel Pump Relay, or Fuel Pump fuse, pull out either one.

Start engine, it will start and then die, fuel pressure is now at 0psi

There is a tool set for removing fuel lines, I like the plastic "ring" set: https://www.princessauto.com/en/deta...et/A-p2990323e

but the metal "scissor" tool will work: OEM Fuel line disconnect tool set 25043 - Read 4 Reviews on OEM #25043

Also both kinds seen here: http://www.ebay.com/bhp/fuel-line-tool
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Old 07-25-2017
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Fantastic. Thank you so much.
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Old 07-25-2017
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Okay.. Can yo please explain like I'm 5 how to remove the fuel lines with the tool? Here are some pictures.


Thanks again



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Old 07-25-2017
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Google: removing ford fuel lines

Several videos to watch
There are different kinds as well, there is no "standard" fuel line connector
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