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LM gas gauge operation
Posted by: Brizo ()
Date: October 19, 2017 09:28AM

I have a customer who says when he fills the tank on his '65 Monza and then restarts the car, the gauge only goes up to about 3/4. But after driving a few minutes, if does slowly reach the full mark. I think this is normal or common operation as the coils in the gauge warm up. What is your experience?

Dan Brizendine,
'64 8door Greenbrier 140 PG. "In beautiful Wanamaker Indiana...with one stop light and 5 pizza shops"

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Re: LM gas gauge operation
Posted by: curt ()
Date: October 19, 2017 09:56AM

Mine will rise a little after running a few blocks after filling up. At full,(full, full) my normal reading reading is 7/8 full. I don't have a problem with that, the gauge does what it designed to to do, it tells me when the tank is near empty. I'm sure one could adjust the sending units rod to get a more percise reading.
1969 Monza 95HP GP.

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Re: LM gas gauge operation
Posted by: oldqmguy ()
Date: October 19, 2017 10:11AM

Interesting! drinking smiley

This is not a problem I have had with the various LM's I have owned over the years BUT I do have this problem with my 2008 Lincoln Towncar!! eye rolling smiley

The outside temperature seems to have some effect on it. It will behave the way you describe in colder temps. It happens when the temps are below 50 degrees, but 'once in a while' it does it during the summer months.

I think (in my case) this may be an "old age" problem (110,000 miles and counting) with the gauge and sender? confused smiley

In the case of the Late Model Corvair I would think your explanation is correct, the gauge just needs to 'warm up' to read correctly, "assuming" that the Sender (float driven variable resistor in the tank) is OK.

Dale cool smiley

Dale E. Smiley CPBE
Life Member The Society of Broadcast Engineers
RETIRED Broadcast Engineer
CERTIFIED CORVAIR NUT
CORSA/Circle City Corvairs/Corvair Performance Group
Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: LM gas gauge operation
Posted by: viewmaster ()
Date: October 19, 2017 10:24AM

My 65 gauge was working fine, until i removed the dash bezel and replaced my speedo. I think it has a bit to do with dash electrical grounding, and/or the multi connection plug. My gauge is all over the place now, as well as the dash lights going cuckoo. Tapping the dash makes the light change intensity...thats why i think its a grounding thing.

-m



Mike
'65 '500' Sedan 110 PG
'65 Monza Sedan turbo'd 110 SU conversion
Fresno, CA

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Re: LM gas gauge operation
Posted by: zachness ()
Date: October 19, 2017 11:07AM

on my '65 the gauge wasn't working when i got the car, it was past full. i just pulled the connector off at the tank and put it back on and it worked fine for a few months, then did the same thing again. apparently while the car was sitting this winter, it fixed itself again! i guess that's just how it is with a 50+ year old car. it's also not uncommon on these gauges to have 4 or so gallons left when the gauge is on "E".

Detroit, Michigan
former Corvairs:
1964 500 2dr (my first car, i bought it for $1!!!)
1965 Corsa turbo vert
presently:
65 Monza 4 door 110/PG
2006 Ford Freestar

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Re: LM gas gauge operation
Posted by: section89 ()
Date: October 19, 2017 11:17AM

my 65 monza does the same thing, takes time to get to the F after filling up.

Well,it did until i decided to install a electric fuel pump as my mechanical was leaking and now my tank leaks around the sending unit sad smiley

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Re: LM gas gauge operation
Posted by: playerpage ()
Date: May 15, 2018 09:51PM

My gauge is doing the "past full" thing, and removing and plugging back in the sender at the tank has had no effect. I have verified there is no visible fraying of the wire at the the tank, so if it is a grounding issue where else should I look?

Eric C. Player
Porterville, CA
- National Member, CORSA
- Member: Central Coast CORSA & South Coast CORSA
Former Member: Vintage CORSA Orange County. Member, ISA (Int. Screenwriter's Assn.), SAG Eligible, and Producer's Guild Aspirant


* Then: 1966 Corsa 180 Turbo, Red/1965 Monza 110 Purple/
1967 Monza 140 Red/1966 500 110 Black/1965 Monza 110 Yellow
* Now: 1966 Corsa 180 Turbo Project. Blue, Blue/Beige interior.



"Chevrolet's Corvair was a maverick machine, a rear-engined renegade born out of spite and genius." -- Sports Car Graphic, August 1969

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Re: LM gas gauge operation
Posted by: MattNall ()
Date: May 15, 2018 10:06PM

Put an ohmmeter on it.... shoulds have 10 -90 ohms resistance with 5 gallons or more of gasoline...

Most likely your sender is bad...

to test gauge GROUND the brown wire and the gauge should read EMPTY





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: LM gas gauge operation
Posted by: playerpage ()
Date: May 15, 2018 10:14PM

You mean pull off the sender cap and put the ohmmeter on the nipple coming out of the tank?

Also thanks for the tip about the gauge test.

Eric C. Player
Porterville, CA
- National Member, CORSA
- Member: Central Coast CORSA & South Coast CORSA
Former Member: Vintage CORSA Orange County. Member, ISA (Int. Screenwriter's Assn.), SAG Eligible, and Producer's Guild Aspirant


* Then: 1966 Corsa 180 Turbo, Red/1965 Monza 110 Purple/
1967 Monza 140 Red/1966 500 110 Black/1965 Monza 110 Yellow
* Now: 1966 Corsa 180 Turbo Project. Blue, Blue/Beige interior.



"Chevrolet's Corvair was a maverick machine, a rear-engined renegade born out of spite and genius." -- Sports Car Graphic, August 1969




Edited 1 time(s). Last edit at 05/15/2018 10:15PM by playerpage.

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Re: LM gas gauge operation
Posted by: MattNall ()
Date: May 15, 2018 10:28PM

YES one lead on the Spade and the other on a good GROUND....like the sender itself.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: LM gas gauge operation
Posted by: 66vairman ()
Date: May 16, 2018 08:49AM

Brizo Wrote:
-------------------------------------------------------
> I have a customer who says when he fills the tank
> on his '65 Monza and then restarts the car, the
> gauge only goes up to about 3/4. But after driving
> a few minutes, if does slowly reach the full mark.
> I think this is normal or common operation as the
> coils in the gauge warm up. What is your
> experience?

The coils work immediately, no warm up. The problem MAY be the fact the needle of the fuel gauge is damped to move SLOOOOWLY. The tank float tends to bounce around while driving so the gauge needle has to be damped or it would move back and forth a lot. I've seen a worn out gauge with needle bounce. Note that sometimes with age the gauge needle may become too slow to respond. On the bench I vary the input to check them.

These old gauges were well built. As others stated connections are an issue after all these years. The tank sender ground gets corroded, poor gauge ground, etc.

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Re: LM gas gauge operation
Posted by: cnicol ()
Date: May 16, 2018 09:22AM

I agree with the slow needle theory. These gauges were damped and that damping grease is now 50 years old.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: LM gas gauge operation
Posted by: Dan ()
Date: May 19, 2018 12:15PM

If any one is interested, I have an NOS 65-66 fuel gauge for sale. $50.00 plus $10 shipping. PM me if you have an interest.

Dan
Chandler, AZ
1966 Corsa Turbo Convertible
[corvaircenter.com]

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Re: LM gas gauge operation
Posted by: steve c goodman ()
Date: May 19, 2018 12:27PM

Dan Wrote:
-------------------------------------------------------
> If any one is interested, I have an NOS 65-66 fuel
> gauge for sale. $50.00 plus $10 shipping. PM me
> if you have an interest.


Dan my Crown car needs it, PM sent

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: LM gas gauge operation
Posted by: steve c goodman ()
Date: May 19, 2018 02:07PM

I apologize to Dan and all of you, I read 'gauge'
to mean 'sender'. The instrument panel gauge is
still for sale by Dan. Sorry all.

I sent Dan a PM so hopefully he will forgive me.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: LM gas gauge operation
Posted by: Dan ()
Date: May 19, 2018 02:20PM

Steve, absolutely nothing to forgive!

Dan
Chandler, AZ
1966 Corsa Turbo Convertible
[corvaircenter.com]

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Re: LM gas gauge operation
Posted by: jjohnsonjo ()
Date: May 19, 2018 04:24PM

[www.corvair.com]


Hi Steve, Not sure if you are looking for NOS, but I have been running Clarks repo for well over ten years now and its still working fine.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: LM gas gauge operation
Posted by: Dan ()
Date: July 02, 2018 11:14AM

Bump

Dan
Chandler, AZ
1966 Corsa Turbo Convertible
[corvaircenter.com]

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