Re: [DML] Low Fuel Light Malfunction

[mike clemens <rmclemns@xxxxxxxxx>]

There are actually two separate circuits inside the fuel quanity transmitter.  One is for the the gage and one is for the light.  They both use a common ground to work.
 
The gage is connected to a spiral wound resistive wire, hence fuel readings up and down.  The low fuel light is a simple metal contact that touches when the float gets to the bottom of transmitter, which turns the light on.  
 
You say the fuel transmitter is factory original, so we will rule out that the transmitter is physically longer than normal.  The problem could be corrosion or gunk on the metal contacts.  From what you described, the float is bottoming out, but not making good enough contact to turn the light on.  When you accelerated, gravity put just enough force on the float to make it contact.  When you leveled out, the light went out.  You need to check and see if the contacts are dirty or corroded.
 
Contact me off line for pictures or any help you might need.  Also, if you pull the transmitter, measure the length of it.  It should be 7 3/8 inches from the bottom of the rubber gasket to the outside portion of the lower part of the plastic cylinder.  Any longer and your new transmitter is sitting to low in the tank, causing the problem.
 
Mike   TPS   1630
 
 

--- On Fri, 7/18/08, daviddelorean <daviddelorean@xxxxxxxxx> wrote:
I had my fuel sending unit replaced with a factory original last year. 
Since the change, my low fuel warning light no longer works. 

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