Home » Public Forums » GMCnet » [GMCnet] How to test fuel tank senders?
| [GMCnet] How to test fuel tank senders? [message #231311] |
Tue, 26 November 2013 09:53  |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
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Senior Member |
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I reckon I can clean these up while I wait on the tanks. I don't even know
if my dash gauges work, and there's no boost switch or tank select.
Remember, the dash was partly disassembled. I can post a video of that
later.
Anyway, assuming I dunk these in vinegar and otherwise clean them up. They
operate as a variable resistor, correct? Just put my ohm-meter on the two
wires and wiggle the float up and down and see what I get? Or is there more
to it?
I'm hoping that I don't have to buy brand new senders.
--
Robin Hood
Jackson, MS
2013 Subaru Outback "Top Flight"
1968 Pontiac Catalina "The Cheshire Cat"
1978 GMC Royale motorhome "Pinto Bean"
1977 GMC Palm Beach motorhome "Barn Queen"
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| Re: [GMCnet] How to test fuel tank senders? [message #231353 is a reply to message #231352] |
Tue, 26 November 2013 13:39  |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
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Senior Member |
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Gene,
I probably will not connect the tanks at the bottom, and just return to
more or less stock configuration.
I see that JimK sells the o-ring. Is that a GMC-only part, or is it
commonly available at all parts stores?
There a circular hole located in the structure above each tank, looks like
the plywood floor above it. Circular hole appears to be in some sort of
pad? Insulation? Anyway. May as well cut a hole in the bottom of the floor
from the underside then? I'm assuming this hole is right over the senders.
On Tue, Nov 26, 2013 at 1:34 PM, gene Fisher <mr.erfisher@gmail.com> wrote:
>
>
> >
> > Anyway, assuming I dunk these in vinegar and otherwise clean them up.
> They
> > operate as a variable resistor, correct? Just put my ohm-meter on the two
> > wires and wiggle the float up and down and see what I get? Or is there
> more
> > to it?
> >
> do not put back the senders without :
>
> - soldering the connection
>
> http://www.gmcmhphotos.com/photos/23-gas-tank-sender-repair/p37204-how-to-repair-a-gas-ta.html
>
> - get a new gasket for the senders
>
> - mark the holes in the floor over the tank, so you can find them when
> next you have a sender problem or go to in-tank pumps
>
> - make sure they remove and replace the drain plugs, you will need them out
> when you make it "one" tank:>)
>
> - i would not put any rubber on top of the tanks (it only will last 2
> years)
>
> - do not use new senders, the old ones fit better
>
> - test senders and gauges / switches before you re-install
>
> - hope you needed to drop the tanks, all could have been done from the top
>
>
>
>
>
> >
> > I'm hoping that I don't have to buy brand new senders.
> > --
> > Robin Hood
> > Jackson, MS
> > 2013 Subaru Outback "Top Flight"
> > 1968 Pontiac Catalina "The Cheshire Cat"
> > 1978 GMC Royale motorhome "Pinto Bean"
> > 1977 GMC Palm Beach motorhome "Barn Queen"
> > _______________________________________________
> > 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
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
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--
Robin Hood
Jackson, MS
2013 Subaru Outback "Top Flight"
1968 Pontiac Catalina "The Cheshire Cat"
1978 GMC Royale motorhome "Pinto Bean"
1977 GMC Palm Beach motorhome "Barn Queen"
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| Re: [GMCnet] How to test fuel tank senders? [message #231362 is a reply to message #231353] |
Tue, 26 November 2013 14:28 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""I probably will not connect the tanks at the bottom, and just return to
more or less stock configuration.
I see that JimK sells the o-ring. Is that a GMC-only part, or is it
commonly available at all parts stores?
There a circular hole located in the structure above each tank, looks like
the plywood floor above it. Circular hole appears to be in some sort of
pad? Insulation? Anyway. May as well cut a hole in the bottom of the floor
from the underside then? I'm assuming this hole is right over the senders.
"'
The O ring is readilly available locally--GM dealers all have them at a price less than the Auto parts chains. The issue of soldering the sending unit "wire" is a big one. Of all the removed but workable sending units I have looked at, that joint was loose or intermittant 100% of the time.
Bob de Kruyff
78 Eleganza
Chandler, AZ
[Updated on: Tue, 26 November 2013 14:28] Report message to a moderator |
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| Re: [GMCnet] How to test fuel tank senders? [message #231364 is a reply to message #231353] |
Tue, 26 November 2013 14:30 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Robin,
Put it back the way the engineers designed it - smart move!
Don't assume anything!
To locate the EXACT position of the senders I would suggest:
1) make a small round piece of wood 1/4" thick the size of the recess in the fuel tank where the sender goes.
2) screw a steel wood screw through the center of the piece of wood long enough so that sticks out about 1/4-3/8"
3) tape the wood on the tank with the screw in the center of the sender hole.
4) position the tank in the correct position fore / aft - port / starboard under the coach and slowly raise it into place
5) when you feel the top of the tank (screw) contact the aluminum sheet shake the tank a bit to mark it with the screw
6) drop the tank back down and you should see a mark in the aluminum sheet
7) drill a 1/8" hole up through the aluminum sheet / insulation / 1" plywood floor / shag carpet
You now have the exact center for a hole saw (or fly cutter) to cut an access port for the senders.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Robin Hood
Gene,
I probably will not connect the tanks at the bottom, and just return to
more or less stock configuration.
I see that JimK sells the o-ring. Is that a GMC-only part, or is it
commonly available at all parts stores?
There a circular hole located in the structure above each tank, looks like
the plywood floor above it. Circular hole appears to be in some sort of
pad? Insulation? Anyway. May as well cut a hole in the bottom of the floor
from the underside then? I'm assuming this hole is right over the senders.
Robin
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] How to test fuel tank senders? [message #231368 is a reply to message #231364] |
Tue, 26 November 2013 15:17 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| Robert Mueller wrote on Tue, 26 November 2013 13:30 |
Robin,
Put it back the way the engineers designed it - smart move!
Don't assume anything!
To locate the EXACT position of the senders I would suggest:
1) make a small round piece of wood 1/4" thick the size of the recess in the fuel tank where the sender goes.
2) screw a steel wood screw through the center of the piece of wood long enough so that sticks out about 1/4-3/8"
3) tape the wood on the tank with the screw in the center of the sender hole.
4) position the tank in the correct position fore / aft - port / starboard under the coach and slowly raise it into place
5) when you feel the top of the tank (screw) contact the aluminum sheet shake the tank a bit to mark it with the screw
6) drop the tank back down and you should see a mark in the aluminum sheet
7) drill a 1/8" hole up through the aluminum sheet / insulation / 1" plywood floor / shag carpet
You now have the exact center for a hole saw (or fly cutter) to cut an access port for the senders.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Robin Hood
Gene,
I probably will not connect the tanks at the bottom, and just return to
more or less stock configuration.
I see that JimK sells the o-ring. Is that a GMC-only part, or is it
commonly available at all parts stores?
There a circular hole located in the structure above each tank, looks like
the plywood floor above it. Circular hole appears to be in some sort of
pad? Insulation? Anyway. May as well cut a hole in the bottom of the floor
from the underside then? I'm assuming this hole is right over the senders.
Robin
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I agree with Rob. The system, as designed, works great. I personally didn't think dropping the tanks was a hard enough job to justify cutting holes in my floor, but that's up to you. Maybe by 2020 when I have to start thinking about replacing the rubber hoses again, I'll wish I had.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] How to test fuel tank senders? [message #231455 is a reply to message #231353] |
Tue, 26 November 2013 21:18 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Robin Hood wrote on Tue, 26 November 2013 13:39 |
There a circular hole located in the structure above each tank, looks like
the plywood floor above it. Circular hole appears to be in some sort of
pad? Insulation? Anyway. May as well cut a hole in the bottom of the floor
from the underside then? I'm assuming this hole is right over the senders.
|
Nope - on my 74 the relief area (hole) cut in the bottom of the floor is over the tubes and connectors. Cutting this hole all the way through will not allow the sender to be removed.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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