Groan!
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| linear fuel sending unit https://slantsix.org/forum/viewtopic.php?t=64428 |
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| Author: | SlantSixDan [ Tue Jan 21, 2020 8:52 pm ] |
| Post subject: | Re: linear fuel sending unit |
Brass float: Ford № COAZ-9202-B Metal strainer: GM № 5651 705 Gasket: Chrysler № 6031 475 Sender grounding clip: From Dante's |
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| Author: | Greg Ondayko [ Wed Jan 22, 2020 11:25 am ] |
| Post subject: | Re: linear fuel sending unit |
If i could get plumkrazy to not be so krazy on us shipping charges!.....??? Greg |
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| Author: | SlantSixDan [ Wed Jan 22, 2020 11:49 am ] |
| Post subject: | Re: linear fuel sending unit |
Did you write to them and ask? |
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| Author: | rich006 [ Wed Jan 22, 2020 5:19 pm ] |
| Post subject: | Re: linear fuel sending unit |
I emailed them about shipping, and they responded that shipping to the USA is A$24.90. The total comes to about A$75 which is about US$50 today. I'm still not sure if their part would actually fit. It looks like it's missing the tab on the wide end, so I'm not sure it would stay in place. |
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| Author: | SpaceFrank [ Thu Jan 23, 2020 10:57 am ] |
| Post subject: | Re: linear fuel sending unit |
Dan, how does that sending unit ground strap attach? I've never seen those before. Wondering if I might need one of these to fix my Valiant's non-functioning gauge. |
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| Author: | SlantSixDan [ Thu Jan 23, 2020 11:43 am ] |
| Post subject: | Re: linear fuel sending unit |
One end clips to the metal pipe coming out of the sender. Other end clips to the metal pipe running to the front of the car. Basically it bridges the short piece of flex hose between the sender output nipple and the hardline. Not a super-great ground method, but obviously good enough when everything's in place and working. Without this in place (or an alternate method of grounding the sender -- drill a hole in the plate, put an appropriate screw through the ring terminal at the end of a wire, apply fuelproof sealer to the screw threads, screw it into the hole, ground the other end of the wire) yeah, you won't get a gauge reading. |
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| Author: | SpaceFrank [ Thu Jan 23, 2020 12:10 pm ] |
| Post subject: | Re: linear fuel sending unit |
Thanks! I assumed there would be enough of a ground from sender -> lock ring -> tank -> strap -> frame. I guess it depends on how clean the connections are between the tank and the frame. One of my Darts has a functioning gauge with no other grounding on the sender. |
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| Author: | rich006 [ Fri Jan 24, 2020 9:41 am ] |
| Post subject: | Re: linear fuel sending unit |
Quote: I'm still not sure if their part would actually fit. It looks like it's missing the tab on the wide end, so I'm not sure it would stay in place.
I asked PlumKrazy about their resistor. Here's the answer:
Quote: None of our Australian resistors will fit any usa model as , all aussie models had VDO (australian made fuel gauges)
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| Author: | SlantSixDan [ Fri Jan 24, 2020 11:01 am ] |
| Post subject: | Re: linear fuel sending unit |
Groan!
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| Author: | rich006 [ Sat Jan 25, 2020 6:11 pm ] |
| Post subject: | Re: linear fuel sending unit |
Today I compared the response of the OEM sending unit to that of the Spectra Premium. First I measured the resistance of each at several float angles. Then I did a little geometry and math to convert float angle to fuel level. Here are the results. As you can see, the Spectra unit matches the factory unit reasonably well at the end points (as the Spectra rep told me), but in the mid-range its resistance is much too high, leading to a too-low gauge reading. For more details on my measurement process, read below the picture.  Geometry: I measured the float angle relative to horizontal. I reasoned that the float height (fuel level) is proportional to the sine of the float angle, plus a constant. Electrical measurements: On the OEM unit I couldn't get steady resistance measurements, so I hooked it up to a 6V flashlight battery and measured the current. From there I used R=V/i to get the resistance. Those current measurements were steady, but my multimeter only reads to the nearest 10 mA of current, so the higher-resistance measurements are a bit uncertain. On the Spectra unit I read the ohms directly with the multimeter. |
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| Author: | SlantSixDan [ Sun Jan 26, 2020 9:53 am ] |
| Post subject: | Re: linear fuel sending unit |
Great data! Send it to Spectra in the (almost certainly futile) hope they'll care. |
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| Author: | Greg Ondayko [ Sun Jan 26, 2020 5:54 pm ] |
| Post subject: | Re: linear fuel sending unit |
Quote: Great data! Send it to Spectra in the (almost certainly futile) hope they'll care.
Indeed Nice date points! Would be nice to see if spectra gives you props for doing their R/D! Greg |
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