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Mustang Technical Discussion > Pre 1973 > How to test aftermarket fuel gauge > Community Forums > Mustang Forum Australia - Mustang Tech

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Frank70
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I think some of you may be aware that I replaced all the gauges in my 70 FB with AutoMeter ones.

Well I had some minor grief with the oil sender being a tight fit next to the fuel pump as it is bigger than the stock one.

Then I had major issues with the electronic speedo sender not having enough clearance between the gearbox and the tranny tunnel.

Solved them both and now it is all working. Very happy with the result.
I actually have a working speedo for the 1st time since I owned the car !

I will try and put together a how-to with pics soon.

Only thing is that I didn't have the presence of mind to make a note of where my old fuel gauge was reading before replacing it to see if the new one reads the same level and now I suspect the new one is reading a bit high.

Is there a more accurate way to check other than filling it , driving it until it reads half and then seeing how many litres fills it ?

I think there might have been a Mustang Monthly article about it - will hunt for it.

Cheers,
Frank.


1970 Mustang Fastback 302 Toploader
1964 Ford Galaxie 500 Sedan 289 C4
1970 Chevrolet El Camino 350 Father/Son project
1995 BMW M3
2002 Ford Falcon XR6

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hybrid
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Makes it hard with the old guages being 5v. Otherwise you could just run a 12v wire to the back of the car, then run a wire from the sender to the old guage and see what it reads.


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nassi
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If the tank has a drain I recommend emptying the tank and then adding 5 litres at a time while monitoring the gauge. You wont get a better representation than that.
cheers


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Shaunp
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Take the sender out, move it all the way down should be empty all the way up should be full.


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donoauto
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Shaunp wrote
Take the sender out, move it all the way down should be empty all the way up should be full.


& then , for accuracy ( & it's a stuff around but worth it ) , drain all fuel from tank & see if you can "feel" how far from the bottom of the tank the sender float sits from the bottom of the tank & calibrate (just bend the float arm) accordingly. I didn't care about the full side of things on mine , just wanted to make sure I had about an inch between the float & the bottom of the tank to ensure I had some litres left when the gauge reads empty. You should also at that time , check by "feel" where the fuel pick up tube sits & even bend it towards the bottom of the tank so it really picks up a lot lower than the float arm at it's lowest point!


(PRAYER) Oh thank you Wild Turkey American Honey & Cola in those small thin bottles, for giving me the strength to act like a half wit, and say stupid things at inappropriate times, semi-anonymously, on a public forum.
Amen.

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Frank70
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Thanks guys - a few good ideas there.

But now I have no voltage regulator - so the voltage to all the new gauges is 12v. I think the fuel gauge responds to a change in resistance , not voltage right ?

Thanks,
Frank.


1970 Mustang Fastback 302 Toploader
1964 Ford Galaxie 500 Sedan 289 C4
1970 Chevrolet El Camino 350 Father/Son project
1995 BMW M3
2002 Ford Falcon XR6

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Shaunp
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no different to before, resistance to earth from the sender determine the volts. just because it has 12v from postive , it wont have that across the gauge to the sender, that depends where the sender is. It's just that this is a 12v gauge not a 5v like factory. No different


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Frank70
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Cool.

Thanks Shaun.


1970 Mustang Fastback 302 Toploader
1964 Ford Galaxie 500 Sedan 289 C4
1970 Chevrolet El Camino 350 Father/Son project
1995 BMW M3
2002 Ford Falcon XR6

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Troy_H
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Frank,
Im doing the same thing, there is a neat little video on the Autometer website, or view it directly in Youtube. Search for "Everything you ever wanted to know about Fuel Level Guages". It show testing the Ohms on the sender, and checking it agianst the gauge. Mine has about 15 litres when it shows empty, so im going to have to bend it down a bit to be a little more accurate.

You will need to play around with the float as already suggested. Wish I had a quick drain plug on my tank now to make the process easier.


I had similar probs with oil sender, electronic speedo sender fit on my unit though. Ended up buying a brand new one from Ford. All calibrated now and working very accurately, in KPH.


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Frank70
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Thanks Troy.

I used the Autometer electronic speedo sender and it was too big to clear the tranny tunnel.

BTW, how did you calibrate your speedo ? I used a GPS , but it is not reading exactly correct. Couldnt think of a place that had 2kms marked out.

Cheers,
Frank.


1970 Mustang Fastback 302 Toploader
1964 Ford Galaxie 500 Sedan 289 C4
1970 Chevrolet El Camino 350 Father/Son project
1995 BMW M3
2002 Ford Falcon XR6

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Troy_H
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I used Map My Run www.mapmyrun.com/ Find a long enough street and pick a street corner to start at, then played around with it to get a street address finish at that is exactly 2km down the road. On the site you need to create a new run and tell it to follow the road when it maps it out, it will then tell you how far from the start it is, you can then drop the pin in a few spots to get the right distance.

I double checked the distance on the sat nav, at worst I would have been out by the tolerances of the device. Going to make little difference over 2km as this woudl have been only a few pulses on the sender anyway. Checked the speedo against the sat nav and it appears to be spot on.

The Ford sender is quite flat and seems a bit smaller than the autometer one i saw picturted, I go with one of these if I was doing it again. There isnt much room in there, as you know.


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Frank70
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Thanks Troy.

So what car is the Ford sender you used from ? In case I have probs with mine down the track.

Cheers,
Frank.


1970 Mustang Fastback 302 Toploader
1964 Ford Galaxie 500 Sedan 289 C4
1970 Chevrolet El Camino 350 Father/Son project
1995 BMW M3
2002 Ford Falcon XR6

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Troy_H
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Anything XD onwards should be electronic, the parts invoice just had Ford Speedo Sender on it, apparently they are all the same according to my parts expert friend. I can get the part number should you need it, I have the reciept at home.


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Frank70
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OK thanks.

I had to make up a small length of cable about 6 inches long. I used the originally cable that had a break in it and it runs into the electronic sender.
Then I mounted the sender in the tranny tunnel, put a little heat shield on it since it is not far from the exhaust and ran the wires in through the shifter hole.

As long as that setup holds together, I should be fine. The only part that might give me probs is where the 6 inch speedo cable plugs into the sender as I had to fabricate a join.

cheers,
Frank.


1970 Mustang Fastback 302 Toploader
1964 Ford Galaxie 500 Sedan 289 C4
1970 Chevrolet El Camino 350 Father/Son project
1995 BMW M3
2002 Ford Falcon XR6

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Troy_H
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This is a pic of my setup. I had to open up the holes on the GT facia to fit the gauges. The original holes were quite small so lots of cutting and dremeling to get a clean finish.


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