Re: [DML] Fuel Sender or the Gauge?
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Re: [DML] Fuel Sender or the Gauge?

I have symptoms similar to Sal's, just no solution as of yet. 

In my case, the gauge is also pegged high when full and when it 
starts to come down, it's about 1/2 tank off from reality.  I use my 
1/2 mark as Empty and the wild fluctuations I get between 1/2 and 
1/4 as REALLY EMPTY. :)

If you are right, then my rheostat wire has also slipped down, just 
less than his. I am puzzled by your description vs. his statement 
that the windings appear to be evenly spaced.  It sounds like your 
senders do not have this appearance.

Sal, if you want to email me a digital photo of what yours looks 
like, I'll pull my sender and do the same.  I'll be working on the 
tank this weekend anyway, installing new pump boots. 

It shouldn't take much to determine if the relative appearances of 
the two senders somehow corresponds to their differences.  Ideally, 
we'd also have a photo of a sender that is functioning perfectly. 
Any volunteers?

There is also the possibility, I guess, that we both have good 
senders and bad gauges.


--- In dmcnews@xxxxxxxxxxxxxxx, mike clemens <rmclemns@xxxx> wrote:
> Hi Sal,
> Since no one else responded, I'll give you my
> thoughts.  I've got three transmitters taken apart and
> sitting in front of me.
> All three exhibit a tendency for the rheostat wire to
> slide to the bottom of the post that it is wrapped
> around thus ending up with too many turns at the lower
> end of the scale.  The wire does not appear to be
> glued to the post, probably so the metal slide will
> make good contact.  You can slide the wire back up the
> post with your fingers, but I have found that gravity
> will eventually cause it to fall back to the bottom.
> My resistance readings are from one ohm to 100 ohms
> one all three.  I don't have any voltage readings at
> this time.  You can contact me offline if you have any
> questions.
> Mike
> --- Steelwings <steelwings@xxxx> wrote:
> > I'm having a problem with either my fuel sender or
> > the gauge. I was hoping someone on the list might
> > give me the benefit of their experience with this as
> > I can find almost nothing in the archives. Here's
> > what is happening: I have a stock, 1981 original
> > gauge and sender. My tank is about half-full. The
> > fuel gauge is indicating an "above full" reading
> > with the low fuel warning light dimly lit. (The
> > needle is at the 12:00 o'clock position) If I remove
> > the sender and allow the float inside to fall to the
> > bottom of the tube, the needle will drop to the
> > "empty" mark and the fuel warning light will
> > illuminate normally. If I manually bring the float
> > up approximately 1/4 of its total travel up from
> > bottom, the gauge will read "Full" and any linear
> > increment below that point will deflect the needle
> > accordingly.(for instance: 1/8 of the total travel
> > from the bottom reads "half-full") I have removed
> > the sender and examined it visually both inside and
> > out. It appears to be in almost new condition. No
> > visible damage, no varnish or discoloration of the
> > plastic or metal components. The float and wipers
> > travel freely along the "rheostat" winding. The
> > windings appear to be evenly spaced and undamaged. I
> > placed a VOM across the wiper lead and winding lead.
> > At the bottom float position, it reads about 20ohms.
> > At the top float position, it reads about 100ohms.
> > Sliding the wiper along the winding , the readings
> > are linear. Then, in circuit, I took a voltage
> > reading across the leads. Black (ground) to Red
> > (Power) was approximately 12.5VDC. Then I checked
> > across black to yellow (the return) and I got the
> > following: With the needle on the gauge reading
> > "full" (4/4ths) with the float approximately 1/4 up
> > from the bottom of the tube, I read 6vdc. (That is:
> > 6 volts to cause the deflection to read exactly
> > full) at 1/8th the travel from the bottom, 3 volts
> > and so on. If I go beyond quarter of the way up from
> > the bottom, the voltage exceeds the 6 volts and the
> > needle will deflect beyond the full mark and
> > continue counter clockwise until it can't go any
> > further. All the way up (full travel) was about
> > 10vdc.  The circuit looks pretty simple but the
> > books don't give me any reference measurements to
> > compare. Has anyone ever measured the resistance of
> > the travel in the stock DMC sender? How many volts
> > will cause a full deflection in the gauge? Any
> > Ideas? Is it the gauge or the sender? Thanks in
> > advance for any advice you guys might have.
> > Sal
> > 
> > 
> > [Non-text portions of this message have been
> > removed]
> > 
> > 
> > 
> > 
> > 
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> > 
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> > 
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> > 
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> > 
> > 
> >     dmcnews-unsubscribe@xxxxxxxxxxxxxxx
> > 
> >  
> > 
> > 
> > 
> > 
> __________________________________ 
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