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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

1993 lightning ECU problems!

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Old Jun 15, 2019 | 11:00 AM
  #16  
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JamesJ4
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From: Santa Fe Texas
Originally Posted by My4Fordtrucks
Due to almost 10 year old fuel, I replaced both fuel tanks and pump assemblies with Spectra over four years ago and haven’t had any problems. No complaints about the accuracy of the sending units.
i've read some pretty mixed reviews about those, i keep seeing failure pretty quick after install. It scared me away from the purchase because when i change it out i plan on removing the bed and i don't want to redo that project due to faulty replacement parts. i couldn't seem to find anything for the truck that was as good as motorcraft and then i had problems trying to figure out what assembly to get (as in a complete setup) I'm very new to this so i'm learning as i go.
 
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Old Jun 15, 2019 | 01:03 PM
  #17  
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I've used Spectra parts many times. No problems. Probably one of the better aftermarket manufacturers.
 
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Old Jun 15, 2019 | 01:06 PM
  #18  
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I dropped the tanks using a floor jack in my (gravel) driveway. Some find it easier to remove the bed. I would rather have to replace a couple mangled tank straps than fight with rusted/spinning bed bolts.
 
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Old Jun 15, 2019 | 01:10 PM
  #19  
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NotEnoughTrucks2014
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From: Saskatchewan Canada
Originally Posted by JamesJ4
So mixed results....relay is good, front fuel pump did not come on, but the rear fuel pump actually came on! To me this proved the ecm needed to repaired which I think was obvious. I saw another diagram that looked like one of the bad/damaged caps was related to the fuel pumps. So, the new ecm is on its way, new fuel filter came today and a fuel pressure regulator is ordered and should be here within a few days.
The fuel pumps are controlled by only one signal from the ECM. This signal operates the relay and the power is then switched by the fuel tank switch on your dash to either the front or rear tank. What you proved is that you had a faulty fuel pump or wiring to your front tank. Still, the bad caps in your ECM could very well have interfered with your ECM's ability to operate the fuel pump relay.

You are on the right track, carry on!
 
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Old Jun 15, 2019 | 01:55 PM
  #20  
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He could also have a bad Fuel Tank Selector switch to cause only one tank pump to pump (run).
Note with a 1993 the plug on top of the fuel tank has also caused problems.
 
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Old Jun 15, 2019 | 04:05 PM
  #21  
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From: Santa Fe Texas
So i think my selector switch is good. It reads the different fuel level in front and rear when i change it, i also pulled the bezel and check the harness/wires to the switch and it seems ok but then again i'm learning as i go here.

As far as possible wiring problems to the front fuel pump that's why i want to pull the bed when i change it. It will be a good chance to clean out everything and have better access to the harness and wiring before removal so i can check them. This truck sat for a while so i'd also like to take the time to pressure wash all the spider webs and mud dobber nests that the bugs built under there. I think i may have discovered a new species in my engine bay for gods sake, I've never seen some of the insects that lived in there!

Wife just called and told me the ECM came in the mail today so after work i'm going to try and get home,install the module, put the 3rd screw on my fuel regulator that i gave up last night because it was giving me so much trouble (i didn't want to remove the intake but i may have to), get some gas and put a few gallons on the rear tank....cross my fingers and try to fire it up.

we'll see what will happen, hopefully some good news finally.
 
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Old Jun 15, 2019 | 07:12 PM
  #22  
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JamesJ4
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From: Santa Fe Texas
Got everything installed, guess I didn't tighten up the fuel regulator enough. Has a small drop. Computer in, filter in lines primed.

Truck finally started, low fuel pressure bouncing 10 to 15 (if the gauge is correct) bad surging rough idle almost wanting to die and the temp climbed up very quick.... but it finally started and ran for the first time without starting fluid since I bought it. Im having a beer and calling it a day.

Thank yall for the help on this one!
 
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