5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Fuel Sender Problems

Thread Tools
 
Search this Thread
 
Old 09-22-2006, 11:07 PM
  #1  
tuff5liter
2nd Gear Member
Thread Starter
 
tuff5liter's Avatar
 
Join Date: Nov 2005
Location:
Posts: 498
Default Fuel Sender Problems

I have a 1991 GT.

Whenever I get into the car the gas gauge says Full, but whenever I start the car it goes to E.

Someone had mentioned that it sounded like it was a bad ground. Im not so sure that may be an issue. Does anyone have any ideas on how to test the fuel sender, or a way to test the wiring. I ahve a dvom, but not so sure what I am looking for. Any help would be greatly appreciated.
tuff5liter is offline  
Old 09-22-2006, 11:12 PM
  #2  
PX429
5th Gear Member
 
PX429's Avatar
 
Join Date: Apr 2006
Location: OC, Cali
Posts: 3,293
Default RE: Fuel Sender Problems

i think it means your low on gas
PX429 is offline  
Old 09-22-2006, 11:15 PM
  #3  
tuff5liter
2nd Gear Member
Thread Starter
 
tuff5liter's Avatar
 
Join Date: Nov 2005
Location:
Posts: 498
Default RE: Fuel Sender Problems

No, i filled it up thinkinking that was the problem. But it was still doing the same thing.

ORIGINAL: PX429

i think it means your low on gas
tuff5liter is offline  
Old 09-22-2006, 11:56 PM
  #4  
tuff5liter
2nd Gear Member
Thread Starter
 
tuff5liter's Avatar
 
Join Date: Nov 2005
Location:
Posts: 498
Default RE: Fuel Sender Problems

no suggestions???
tuff5liter is offline  
Old 09-23-2006, 12:11 AM
  #5  
Pure5.0
3rd Gear Member
 
Pure5.0's Avatar
 
Join Date: Mar 2005
Location:
Posts: 699
Default RE: Fuel Sender Problems

Watch your guages....sometime when you turn your car off the needle has a tendency to do its own thing...like float to full.
Pure5.0 is offline  
Old 09-23-2006, 12:13 AM
  #6  
tuff5liter
2nd Gear Member
Thread Starter
 
tuff5liter's Avatar
 
Join Date: Nov 2005
Location:
Posts: 498
Default RE: Fuel Sender Problems

i dont have the stock gauges. i have the nordskog digital dash. It all started whenever i changed my fuel pump.

00 is empty and 99 is full



gauges are still in the stock location

ive never had a problem with the gauges and they have always worked beautifully. But i am trying to find some kind of wiring diagram for the sender or any advice on how to trouble shoot the problem :-)
tuff5liter is offline  
Old 09-23-2006, 12:30 AM
  #7  
tuff5liter
2nd Gear Member
Thread Starter
 
tuff5liter's Avatar
 
Join Date: Nov 2005
Location:
Posts: 498
Default RE: Fuel Sender Problems

i just dropped my tank and unplugged my sending unit, and it still reads full at the ON position before i start it....
tuff5liter is offline  
Old 09-23-2006, 12:42 AM
  #8  
Joel5.0
5th Gear Member
 
Joel5.0's Avatar
 
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
Default RE: Fuel Sender Problems

Need to do a resistors check.....install a 14 - 18 ohms resistor to the sender signal wire and the other resistor lead to ground, and it should read empty.....do the same test with a 155 - 165 ohms resistor, and it should read full.....any resistor value in between, and it should read from 00 - 99...if OK, the sender is bad....otherwise.......does that panel uses an OEM anti-slosh module?......

FYI....you may want to use the following diagram:

Joel5.0 is offline  
Old 09-23-2006, 01:05 AM
  #9  
tuff5liter
2nd Gear Member
Thread Starter
 
tuff5liter's Avatar
 
Join Date: Nov 2005
Location:
Posts: 498
Default RE: Fuel Sender Problems


ORIGINAL: Joel5.0

Need to do a resistors check.....install a 14 - 18 ohms resistor to the sender signal wire and the other resistor lead to ground, and it should read empty.....do the same test with a 155 - 165 ohms resistor, and it should read full.....any resistor value in between, and it should read from 00 - 99...if OK, the sender is bad....otherwise.......does that panel uses an OEM anti-slosh module?......

FYI....you may want to use the following diagram:

nope
tuff5liter is offline  
Old 09-25-2006, 01:53 AM
  #10  
tuff5liter
2nd Gear Member
Thread Starter
 
tuff5liter's Avatar
 
Join Date: Nov 2005
Location:
Posts: 498
Default RE: Fuel Sender Problems

ok ran a new wire from the gauge to the sender. started the car and it said 00 (empty) so i drove down to the gas station and filled it up (it only held 3 gallons). It still says empty. Anyone have any ideas now?

Edit: as soon as i have a chance i am going to run a new ground wire, but i really dont want to drop the tank with it full completly. It really sucked last time, since i dont have any help.
tuff5liter is offline  


Quick Reply: Fuel Sender Problems



All times are GMT -5. The time now is 07:34 AM.