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Fuel Tank Sender [message #123261]

Tue, 26 April 2011 09:47

g.winger

Messages: 792
Registered: February 2008
Location: Warrenton,Missouri

Karma: 0

Senior Member

What is the MT and Full of the sender in ohms of course????thanks,,,,PL

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Re: Fuel Tank Sender [message #123270 is a reply to message #123261]

Tue, 26 April 2011 11:03

Rick Williams

Messages: 256
Registered: July 2004

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Senior Member

0 ohms empty
90 ohms full

Rick Williams
Bliss, Michigan
1978 Eleganza II

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Re: [GMCnet] Fuel Tank Sender [message #123275 is a reply to message #123270]

Tue, 26 April 2011 11:32

Arthur Mansfield

Messages: 290
Registered: April 2010

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Senior Member

My main tank sending unit reads 5/8 of tank when empty. The other one does not work. It was working then started stopping at 5/8. I ended up running one tank empty is how I found out.

I sure do not want to drop the tank again.

Art & Doris
EL 76
On Apr 26, 2011, at 11:03 AM, Rick Williams wrote:

>
>
> 0 ohms empty
> 90 ohms full
> --
> Rick Williams
> Gladstone, Michigan
> 1978 Eleganza II
> _______________________________________________
> GMCnet mailing list
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Re: [GMCnet] Fuel Tank Sender [message #123278 is a reply to message #123275]

Tue, 26 April 2011 11:42

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

Art
Here is something that I posted a few months ago that might help you.

Before you drop the tanks do a small test.

There are three wires going from the inside wall of the motorhome and through a small hole in the frame and then to the tanks. Actually one of them carries 12 Volts to the tank selector valve when the dash switch is put into AUX tank. The other two wires go to each of the tank senders. Put a small pin through each of the three wires so that you can get a meter on them. Turn on the key and put the dash switch to AUX. Then go to the three wires and use a voltmeter with one lead grounded to your frame and touch each of the three wires so that you can determine which has 12 volts. Pull the pin out of that wire as you know that goes to the tank selector valve.

Then use a jumper wire and ground from one pin to the frame. Check the fuel gauge. If it goes to empty you know that wire is good to the point of the pin and you also know that it goes to the AUX tank (front tank). If nothing happens mover the dash switch to MAIN. The gauge should go to empty and you then know that that wire is the one that goes to the rear or MAIN tank.

Then pull that pin and ground the other pin to the frame. The opposite tank (from the one determined above) should now register empty.

If all of that works as described you now know that the fuel gauge is OK and the wires from the frame to the fuel gauge are OK.

I once had a problem with one tank and found that the one wire going into the wall had been chewed in half by a mouse. The wires run in the wall behind the couch and down to the bottom and out a hole toward the frame. That hole is located right at the rear of the wall panel behind the couch. I cut a small piece from the corner of the board and I was able to snake a wire down through the hole and splice it into the broken wire and to the wire behind the wall panel.

If the tests above work all right then you know for sure that the problem is between the frame and the top of the tank(s). Good luck.

Emery Stora

On Apr 26, 2011, at 10:32 AM, Arthur Mansfield wrote:

> My main tank sending unit reads 5/8 of tank when empty. The other one does not work. It was working then started stopping at 5/8. I ended up running one tank empty is how I found out.
>
> I sure do not want to drop the tank again.
>
> Art & Doris
>

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Re: Fuel Tank Sender [message #123285 is a reply to message #123261]

Tue, 26 April 2011 12:46

g.winger

Messages: 792
Registered: February 2008
Location: Warrenton,Missouri

Karma: 0

Senior Member

Thanks Rick. Don't need new senders. Mine work fine. New gages for the new dash,,,,,,,PL

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Re: [GMCnet] Fuel Tank Sender [message #123290 is a reply to message #123275]

Tue, 26 April 2011 13:22

Mr ERFisher

Messages: 7117
Registered: August 2005

Karma: 2

Senior Member

there is always this

http://gmcmotorhome.info/Fuel.html#senders

gene

On Tue, Apr 26, 2011 at 9:32 AM, Arthur Mansfield <1104agm@gmail.com> wrote:

> My main tank sending unit reads 5/8 of tank when empty. The other one does
> not work. It was working then started stopping at 5/8. I ended up running
> one tank empty is how I found out.
>
> I sure do not want to drop the tank again.
>
> Art & Doris
> EL 76
> On Apr 26, 2011, at 11:03 AM, Rick Williams wrote:
>
> >
> >
> > 0 ohms empty
> > 90 ohms full
> > --
> > Rick Williams
> > Gladstone, Michigan
> > 1978 Eleganza II
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>

--
Gene Fisher -- 74-23,77PB/ore/ca
�Give a man a fish; you have fed him for today --- give him a URL and
-------
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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