fuel gauge works backwards?

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fuel gauge works backwards?

Postby dazeaway » Sat Mar 29, 2014 2:37 pm

OK I am looking around and cant seem to find an answer... but why does my fuel gauge work backwards? Reads empty when full and vise versa. What did I do wrong?
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Re: fuel gauge works backwards?

Postby DannyP » Sat Mar 29, 2014 3:53 pm

Nothing. Take the sender out and physically bend the float wire 180 degrees. This way it will reverse the resistance change, full(or empty) will be zero ohms instead of full resistance and vice versa. I don't remember which way it works but this is truly the easiest way to fix this.
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Re: fuel gauge works backwards?

Postby dazeaway » Sun Mar 30, 2014 8:59 am

OK I did that and now it doesn't fit in. It would appear that the bolt pattern on my tank and sender is not symmetrical and this thing only fits in one way. ...? If I try to put it in the right way obviously now with the arm bent backwards it wont fit and the other way the bolt pattern does not line up.. Do you retap the ring in different places?
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Re: fuel gauge works backwards?

Postby DannyP » Sun Mar 30, 2014 10:33 am

Good question. I didn't have to do this, just relaying what a bunch of others have done. I think all the holes will line up except one, so yeah, rotate the gasket, drill a hole andcall it done.
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Re: fuel gauge works backwards?

Postby dazeaway » Sun Mar 30, 2014 11:34 am

yep turned it around three holes were perfect one hole just off and one hole re-drilled. All set now.

Thanks
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Re: fuel gauge works backwards?

Postby beck688 » Sun Mar 30, 2014 11:53 am

I really wish all my gas gauges would go backwards.
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Re: fuel gauge works backwards?

Postby Larry Jowdy » Mon Mar 31, 2014 4:39 am

Ray, it actually will, look on the internet and start buying all the devices that offer 10%, 20% even 30% better mileage. If you add enough of them, everytime you drive, you'll have to stop to let gas out of the tank.
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Re: fuel gauge works backwards?

Postby beck688 » Mon Mar 31, 2014 8:13 am

Great idea Larry. Why don't other people think of this stuff - it is all together too easy. Geez I also heard that there is a carburetor that will get 100 miles to a gallon but it is being suppressed by the car companies!
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Re: fuel gauge works backwards?

Postby egrant5329 » Thu Apr 10, 2014 11:05 am

Dazeaway,
This quote is an from an old post on fuel senders. I had the same issue years ago and ended up going to a centroid sender. They work really well and can be custom made for your tank. http://www.centroidproducts.com/
egrant5329 wrote:This is from an old post, but basically it sounds like you need GM 0-30 ohm sender. Mine worked in reverse too and ended going to a centroid sender.
---------------------------------------------
After a little \"Google\"ing, I came across some info that suggests there are a few standard ohm ranges for fuel senders:
Sender type--------------empty resistance-------full resistance
GM 30 ---------------------0 ohms-----------------30 ohms
GM 90----------------------0 ohms-----------------90 ohms
GM 250-------------------40 ohms-----------------250 ohms
Ford 10-------------------73 ohms-----------------10 ohms
Ford 150------------------20 ohms-----------------150 ohms
VDO 180------------------10 ohms-----------------180 ohms
Stewart Warner/Sun 33--240 ohms-----------------33 ohms
Import 4-------------------112 ohms-----------------4 ohms

One site said that the GM 30 was used on Pre 1965 GMs. Interesting considering the Brazilian guages seem to need the 0-30 ohm sender.
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Re: fuel gauge works backwards?

Postby dlearl476 » Fri Feb 09, 2018 8:09 pm

So it was 59° today so it's time to get on my winter "to do" list while I can still wear my fur-lined flight helmet. :D

This and my clamshell release are on the top of the list. Are there any more detailed explanations, preferably with pics, as to modifying the VW sending unit to work properly?
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Re: fuel gauge works backwards?

Postby EEricson » Sat Feb 10, 2018 5:15 pm

You can't just bend the float arm 180 degrees? That's what the TR manual says to do.
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fuel gauge works backwards?

Postby egrant5329 » Sat Feb 10, 2018 5:16 pm

dlearl476 wrote:So it was 59° today so it's time to get on my winter "to do" list while I can still wear my fur-lined flight helmet. :D

This and my clamshell release are on the top of the list. Are there any more detailed explanations, preferably with pics, as to modifying the VW sending unit to work properly?


Just bend the float around backwards.
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Re: fuel gauge works backwards?

Postby RBP » Sun Feb 11, 2018 5:26 am

I went with the Centroid unit as well, works perfect and there is no bounce. Not an expensive item and worth a few extra bucks. If you want to stick with the one you have, as EEricson points out, refer the TR manual page 21 I believe.

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Re: fuel gauge works backwards?

Postby DannyP » Sun Feb 11, 2018 10:38 am

Bend the float arm like I said 4 years ago. It isn't that hard.

Rudy, the new Speedhut fuel gauge has hysteresis built-in, so no bounce. I'd never considered the centroid, good choice.
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