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| Re: [GMCnet] DO NOT RUSH TO DROP YOUR TANKS ---YET [message #231618 is a reply to message #231615] |
Thu, 28 November 2013 10:02   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Mr ERFisher wrote on Thu, 28 November 2013 10:04 |
<snip>
YOU MAY BE OK - FOR NOW
READ AND MAKE YOUR OWN DECISION
THERE IS MORE TO COME
GENE
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Gene,
Your direction to the compedium is a great idea, and very little of what you reference is less that great. But I have gone around with fuel level senders on three occasions now and I am afraid that I have to caution anyone that tries to repair them by soldering the bad joints that they should also do the holes in the coach floor as they will be at them again in the future.
At one round, I soldered all the joints that proved problematic. The next round, I soldered all the joints in the sender assembly. There is a problem there that the nichrome resistance wire simply would not take solder. This is understandable as it is really close to a stainless steel. I could not tighten the joint at the ground end successfully. So, I ended up getting and installing aftermarket sensors. The was a very involved and only marginally successful operation.
Other that buying new sending units in spite of the mis-alignment of the connections (my experience with a unit another's purchase from JimB and I am not certain that this is the case with all available parts). I have no good other idea. I have investigated other types of senders and not found one that can read a 6" (5.75 actually) deep tank with an almost no (about 1") headroom over the tank top.
If I come up with a good idea, I will share it.
I am real good at getting tanks down and back up while working alone.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] DO NOT RUSH TO DROP YOUR TANKS ---YET [message #231622 is a reply to message #231618] |
Thu, 28 November 2013 10:22 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Nov 28, 2013, at 11:02 AM, Matt Colie wrote:
> I have investigated other types of senders and not found one that can read a 6" (5.75 actually) deep tank with an almost no (about 1") headroom over the tank top.
Ultrasonic transmitters, magnetostrictive sensors, bubbler tubes...there are many clever ways to do it. :) Interfacing them to a 90 ohm gauge is a different story!
> There is a problem there that the nichrome resistance wire simply would not take solder. This is understandable as it is really close to a stainless steel.
I've not tried it myself but I've heard that you can tin-lead solder to nichrome and other nickel-bearing alloys if you put a small plating of silver-bearing solder on the location first. YMMV!
--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] DO NOT RUSH TO DROP YOUR TANKS ---YET [message #231632 is a reply to message #231615] |
Thu, 28 November 2013 11:32 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
Karma: 0
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The idea of an auxiliary deep tank as is used in some of the EFI systems seems like a good alternative to solve that problem. I agree that the shallow tanks do create a few issues, but certainly are nice from a packaging standpoint.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] DO NOT RUSH TO DROP YOUR TANKS ---YET [message #231662 is a reply to message #231622] |
Thu, 28 November 2013 20:03 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Jim Miller wrote on Thu, 28 November 2013 11:22 |
On Nov 28, 2013, at 11:02 AM, Matt Colie wrote:
> I have investigated other types of senders and not found one that can read a 6" (5.75 actually) deep tank with an almost no (about 1") headroom over the tank top.
Ultrasonic transmitters, magnetostrictive sensors, bubbler tubes...there are many clever ways to do it.  Interfacing them to a 90 ohm gauge is a different story!
> There is a problem there that the nichrome resistance wire simply would not take solder. This is understandable as it is really close to a stainless steel.
I've not tried it myself but I've heard that you can tin-lead solder to nichrome and other nickel-bearing alloys if you put a small plating of silver-bearing solder on the location first. YMMV!
--Jim Miller
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Jim,
I actually investigated three different systems that would have had an equivalent to a 90Ω sender, but the one that was reasonable cost also had to have a 2" over the tank headroom.....
As to making what ever has any analog output look like a 90Ω sensor, any EE worth his paper can probably come up with that one. <Hint<
I have silver soldered (real old silver and cadmium stuff) nichrome, but the materials around the element would never take that kind of heat.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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