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Hq Fuel Sender

I have a HQ GTS dash in my tonner and got a fuel sender out of wb tonner. It does not work, and I have heard theyr are diffrent senders, Early HQ and the other magnetic type (later models). My questions are...

For the GTS dash do I need the early HQ type?

Is there a visible diffrence between the two types (early and magnetic) so that I can tell which is which?

And are Sedan and Ute fuel senders compatible with the Tonner Senders?

Thankyou.

Matt

Model: 

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Sedan fuel tank senders ARE visibly & physically different to ute/p-van,1 ton fuel senders which are the same,I was pretty sure all HOLDEN fuel senders were of the rheostat windings type and I have never seen "a magnetic" one.
Your HQ GTS dash should operate fine with the 1 Ton tank sender unit,you can buy them reconditioned for around $80 if it's not the gauge thats faulty.

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Hmmm it doesnt work fine, it gives me the [Naughty Pottyword]s, it will read either full or empty, nothing in between. So i never know where I am at. I was just on the rarespares site and they claim theyr is also two diffrent types, the earlier ones do look a wee bit diffrent to the later ones. Thanks Knuckles. Anyone else want to chime in?

Matt

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The fuel sender type changed abbout ยฝ way through the HQ run.

If you have an early gauge, you need an early HQ sender. If you have the later HQ gauge, you need the late HQ - WB sender.

While the Sedan and Ute/Tonner/Van senders are different, they all create the same resistance for the gauge at full, ยฝ and empty so they will all work the gauge the same.

Your best bet is to remove your sender and pickup (which sounds like it is faulty anyway) or buy a second hand one (really cheap...) and take it and your fuel gauge along to an auto instrument mob. Ask them to replace the sender and calibrate the gauge and sender together. Then you will have the RAREST gauge in the world...an accurate HQ fuel gauge.

HTH.

Cheers...Dave
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Cheers...Dave

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HAHA, classic Dave! Yes that would be the wise thing to do. Bloody GMH changing all this stuff halfway through the run! Is there a way to tell if you have an early or late HQ GTS guage?

Ta.

Matt

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Sometimes, there is a date stamped on the back of the gauge. Other than that, or taking it to an auto instrument mob who could probably tell you just by looking at it, the needles are supposed to be a slightly different red...but years of exposure to sunlight and consequent fading make this method of ID'ing an early or late gauge risky at best.

I think the changover in the gauges/senders occurred in Jan 73.

Cheers...Dave
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Ok I've looked into this recently. This will save some heartache for you. There were 2 main types of fuel gauges fitted to Holdens at this time. Thermal and Magnetic. If your fuel gauge flies straight up when you turn on the ignition you've got a magnetic or (moving coil) gauge. If the gauge moves v-e-r-y slowly up then you've got a thermal gauge.
Knuckles was right when he said the ute, pano, and tonner senders are the same, BUT, there are 2 types of senders amongst them. Magnetic and Thermal, naturally to suit the 2 types of gauges. They look physically the same, and are both rheostat type senders, its the resistance properties that are diffent. I.e need a multimeter to check them. The Thermal sender reads about 10 ohms on full and 70 ohms on empty. The Magnetic sender reads about 120 ohms full and 40 ohms empty. Rare spares does reco senders and usually have them labled properly. You can see if you mix up the wrong sender and gauge they have no chance of working properly. For instance if you have a thermal gauge hooked up to a magnetic sender as you fill your tank the gauge will show less fuel, go figure!
Hope this helps
Cheers
LMH

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Hi All

It gets very confusing, from iwhat i went through with my HQ earlier this year i can add the following.

the thermal and magnetic relates to how the fuel guage itself works, one uses a electrical resistance to make the needle move, the other thermal uses a bimetalic strip in the guage unit, depending on the incoming signal a variable current makes the bimetalic strip curve, this makes the needle moove.

The sender units in the tank have a resistance fro the hi/full position to the low/empty, grab yours and attach a multimeter on it, one probe anywhere metal, the other on that little electrical contact.

As you moove the arm from full to empty you will get some readings.

My 3/73 HQ is a 'early one' i know the readings are 74/10, my mates 2/73 sedan & 10/72 coupe are i think 30/0 ( maybe as love my hlden stated 140/40 or 140/30 i know there is a 30 in there somewhere)

Either way you need a matched set sender unit to guage.

To make it worse you need corect floats as the shape of fuel tanks vary, so the 1tonne being more boxxy would have a diferent float/arm to the relatively flat sedan type tank.

The only way is to take both to a auto electrican or instrument shop and get it matched - mine cost $120 for test cleaning and recalibration of all 4 small guages - the battery & water only needed cleaning, the oil pressure worked on his bench, but all the sender units i have tried only show it very low, but my mates sender of his 350 HQ chev, works fine in my car, but its stamped VDO only at @$80 for a sedner unit its to pricy for me to buy and try

Regards
George

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Thanks for all the help. Very interesting to say the least.

Matt

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The early gauges had the last few markings (near empty) in orange; latter ones have all markings in white

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I think you'll find the hj-wb tank unit wont work the hq vdo gauge. The 1st hq gauges were made by flexdrive.

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The oil sender unit off the VK Injected works fine with the Q gauge, I had both the GTS oil gauge and an aftermarket oil gauge and they read pretty similar, allowing for the GTS one just moving a needle while the other one shows the psi.
You can pick them up for next to nothing secondhand.

johnperth

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hi there i have this problem too,but what i want to know is if u connect the wrong fuel sender to the gauge but still move the float by hand would the needle on fuel gauge still move of any sort at all,cheers

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I want 2 fit hq discs and drum diff 2 my EJ VAN can i use a VH40 BOOSTER WITH THAT SET UP

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