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Fuel sending unit question now...

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Old Jan 30, 2016 | 09:42 AM
  #1  
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From: Longview WA
Fuel sending unit question now...

Have a 93 f150 short bed my fuel gauge is reading empty when i have 8 gals left in the tank... So im assuming there is a float that is corroded or full of gas inside the tank?? Im new to fords still so after crawling underneath it also seems simpler to take the bed off the truck rather than disconnect and get a jack and drop a tank.. So the big question what all needs unbolted or disconnected to get the bed off? And is there good replacement floats avail or just factory? Thanks
 
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Old Jan 30, 2016 | 09:56 AM
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From: The Ole' North State.
Originally Posted by Gunnerboy
Have a 93 f150 short bed my fuel gauge is reading empty when i have 8 gals left in the tank... So im assuming there is a float that is corroded or full of gas inside the tank?? Im new to fords still so after crawling underneath it also seems simpler to take the bed off the truck rather than disconnect and get a jack and drop a tank.. So the big question what all needs unbolted or disconnected to get the bed off? And is there good replacement floats avail or just factory? Thanks
You can un-plug the tail lights pretty easily, and unscrew the filler neck(s) from the bed as well. Six bolts, and a couple of friends and it comes of pretty easily. I've pulled mine couple of times now for various reasons.
 
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Old Jan 30, 2016 | 10:10 AM
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I dropped my rear tank without taking the bed off, and it wasn't too bad.
Four bolts to take off the straps, and disconnect the fuel lines from the top once you get it lowered some.

But getting the bed off was kind of a pain (probably because I live in the rust belt), Only two of the six bolts actually came out easy. We had to burn the heads off of the other four, because the entire bolt would spin when trying to get the nut off.
 
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Old Jan 30, 2016 | 11:16 AM
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Jake is right, if the bolts are rusty.. may want to look at dropping the tank. I think even one of the guys in Texas, not typically a rust state, had the same issue, and ended up cutting some bolts.

Guess I just got lucky.
 
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Old Jan 30, 2016 | 05:13 PM
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I prefer to drop the tank. It's a simple job. I used two nylon ratchet straps to lower the tank to the ground. Did the reverse to install the new one. It's a three beer R&R.
 
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Old Jan 30, 2016 | 08:29 PM
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Alright only thing im dreading is disconecting fuel lines atop a tank... Also anyone know where to get a new float?? The local ford dealership looked at me like im stupid and said those dont exist.. and all the parts stores laughed....
 
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Old Jan 31, 2016 | 02:15 PM
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So i got the bed off... one hell of a job by your self haha Got my fuel sending unit out and it has a plastic float... and the tank is about half full yet my gauge reads empty?? So any suggestions how to fix this? Today is my only day off for the next 2wks so im hoping to knock this out.
 
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Old Jan 31, 2016 | 02:41 PM
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Ford should sell the PS19 fuel sending unit.
Here is a link to one:
https://www.stockwiseauto.com/motorc...rd&Model=F-150

When you turn on the key with it plugged in can you move the float up and down to see if the gauge in the cluster moves?

All so with the unit unplugged the and the key on with that tank selected the gauge should peg passed full. If it does not and the gauge works on the other tank then the wiring to that tank is shorted to ground.
Low resistance on the wire = low (empty) reading on the gauge.
High resistance on the wire = high (full) reading on the gauge.
 
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Old Jan 31, 2016 | 02:49 PM
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Alright well its a single tank truck i should have mentioned that... and there is enough fuel to keep the float up half way yet the gauge reads empty.. Ill go unplug and see what happens
 
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Old Jan 31, 2016 | 03:01 PM
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The float is most likely "sinking" giving you the empty tank reading.

I donʻt think there is a fix for the sinking float other than a new sending unit.
 
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Old Jan 31, 2016 | 03:09 PM
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yeah just tested it and it only works to manipulate the gauge going from half to full if it falls below half gauge goes to empty... so guess ill go to the parts store..if any of them even have one instock haha.
 
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Old Jan 31, 2016 | 03:51 PM
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Ford part numbers for the PS19:
F0PF9A299AA & FOTZ9A299AA
 
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Old Feb 1, 2016 | 01:12 AM
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Amazon sells the floats separately.
 
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Old Feb 1, 2016 | 09:17 AM
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Well no parts stores had one in stock for under 250$... So i Took mine apart at the gauge float section last night found that yellow wire that went to the float arm area wasnt fully connected so i got it put back right and i bent the arm to the float until it read correctly Now after 110 miles it shows half a tank which according the my MPG average is correct.
 
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