Bad ground at tank end or gage end. My
1955 Chrysler only had a single wire from the sending unit to the gage and
relied on sheet metal contact to rusty trunk floor for ground. I added a
ground wire to the base of the float unit to a secure, dry ground lug higher up
in the trunk and took most of the jitter out.
Rich Barber
Brentwood, CA
From: Forward Look
Mopar Discussion List [mailto:L-FORWARDLOOK@xxxxxxxxxxxxx] On Behalf Of Jan
& Roger van Hoy
Sent: Friday, August 18, 2006 7:33
PM
To: L-FORWARDLOOK@xxxxxxxxxxxxx
Subject: Re: [FWDLK] gas gauge
questions
Ok, here's what I've heard so far---
my expectation is poor contact in the tank unit. on and off
contact would make it jump a lot. Just a little fuel movement would move
it just enough to flutter.let car sit for an hour and then turn switch on without
getting in or jiggling the car. Bet is doesn't move them but still could
if at right point.
You lose. The needle jumps back and forth without even getting
into the car.
Rock and roll of the fuel against the float.
varnish build up on the resistance wire in he sending unit in the
tank. Try adding some carb cleaner to the gas or remove the sending unit
and soak/rinse in acetone or lacquer thinner.
Maybe we're on to something here. But standing still?
Faulty fuel gauge..time to remove and repair, or find a replacement.
Ahh, that leads me to my second question. I just happen to have a
6v '55 Plymouth
fuel gauge which will fit right in. But will it work? Is the '56
12v system reduced to 6v by the voltage limiter?
So any more suggestions would be welcome...
----- Original Message -----
Sent: Friday, August 18, 2006 8:23 AM
Subject: [FWDLK] gas gauge questions
> These are probably some of the dummest questions I've asked...
>
> [1] What causes a gas gauge needle to bounce/jerk/flutter rapidly back and
> forth? This happens in my '56 Plymouth
whether or not the car is moving and
> at any amount of fuel except plumb full. Seems to be too fast to be
the
> float unit. [This is a hardtop; electromagnetic gauge not the SW
> thermostatic gauge.]
>
> [2] What's the difference between a 6v fuel gauge and a 12v fuel gauge,
> specifically in the '55-'56 Plymouths? Doesn't the voltage limiter
on the
> 12v drop the voltage down to 5-6v?
>
> --Roger van Hoy, Washougal, WA, '55 DeSoto, '58 DeSoto, '56 Plymouth, '66
> Plymouth, '41 Dodge
>
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