[Chrysler300] Fwd: Re: Gas tank sending unit

["Noel Hastalis cpaviper@xxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

Matt and Group,

Here's an email exchange from two years ago on this gas tank sending unit issue, and response from John Grady -
Noel

> ---------- Original Message ----------
> From: John Grady <jkg@xxxxxxxxxxxxxxxxx>
> To: Noel Hastalis <cpaviper@xxxxxxxxxxx>
> Date: 07/29/2018 2:50 PM
> Subject: Re: Gas tank sending unit
> >  
> Hi Noel, All these aftermarket units seem to be of poor linearity between float position and gauge reading -/ it drives you nuts. I had little signs in my cars for where is the real empty . Typically they ( 60 up) read near empty with still 5 gallons in there .you think gauge is wrong and run out.  Go above  F when full . The ohmic values can be off too , but they are published , Usually not too far off. have actual F ohms somewhere but basically about ten ohms or less full ( up) and 85-90 down . One answer is to be sure float is just about touching bottom of tank dry .. maybe 1/4 “ ..bend rod .  Then E really is E . ( can run  unit in your hand too , ground flange with clip lead ) ; bend arm for that . Full may be off a bit but sort of not the issue ? Often the old one can be cleaned up and used . If not rusty inside. Original Problem is usually poor ground . Solder a wire direct to metal outlet tube and ground to body sheet metal  . Run in your hand before putting it in . If still reading above E when  all the way down you could add ? 5-10 ohm 2 watt resistor in series will drop gauge ( iterate ) .. But usually I think it is the bend and travel of float is all wrong . Not ohms. Universal mopar fit for dart or something they sell to all ... 
> I empathize ... ps messing with gauge itself a  big no no , usually makes things worse . Test gauge , 10 ohms to ground should be near F , 90 near E . Can buy various resistors at radio shack .. or on line . 2 watt best ,1/2 watt might burn out 
> Hope this helps, John 
> PPS . Temp and oil pressure gauges are the same electrically .. good to know . Work on ~ same ohms changes . 
> 57 gauges totally different than 60 up , which are thermal gauges . 57 are magnetic . First hand info above is 300F , but I think approximate same ohm values in use ,in 57  but not sure 
> Sent from my iPhone
> 
> > On 28 Jul 2018, at 10:58 pm, Noel Hastalis <cpaviper@xxxxxxxxxxx> wrote:
> > 
> > Hi John,
> > Yesterday I was talking with the mechanic of a local buddy of mine, who said he's having problems with this aftermarket gas tank sending unit. The gas gauge is not reading the top 1/4 and the bottom 1/4 gas level in the tank. He called and spoke with Jeff Carter's associate, who thinks the problem is this unit has too low a level of ohms, to properly handle the full range of the gas level reading. 
> > He's got this problem on his '57 NYer, '61 NYer and '57 Adventurer. 
> > Does this make sense to you?
> > Noel


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Posted by: Noel Hastalis <cpaviper@xxxxxxxxxxx>
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