F1 fuel gauge and mustang sender bench test video
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Senior User
Joined: Sep 2012
Posts: 132
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From: North Sewickley, PA
F1 fuel gauge and mustang sender bench test video
Here is a quick video I made. I'm using a L7806 constant voltage reducer, and a 9 volt battery for test purpose only. I don't know how the gauge is going to react once the sender is in the tank. I'll probably do another video then. This is all I have for now.
Lead Driver
Joined: Aug 2006
Posts: 8,094
Likes: 654
From: Brentwood, TN
Nice video, only comments I would have is that I would have liked to have seen the actual voltage applied to the circuit out of the L7806 and the actual resistance as read across the fuel sender. You alluded to the fact that the float rod could be bent to match the tank, I have found that it is difficult to gauge the distance that the float will be above full deflection either at the top or bottom when installed in the tank. In my 40 I read the resistance across the sender with the tank dry and then at 1 gallon intervals as I filled it just to see how linear the resistance readings were at various levels. Thanks for putting forth the effort to video document your test and sharing it with the forum.
Senior User
Joined: Jul 2003
Posts: 322
Likes: 1
From: FL
L7806 pdf, L7806 description, L7806 datasheets, L7806 view ::: ALLDATASHEET :::
Table 6 on Page 11 is of interest - 9-25V with a max voltage of 35V and a tolerance of +/- .25V
Can't speak to the sender...but my experience with the L7806 shows them to be very stable regardless of input voltage/current...
Table 6 on Page 11 is of interest - 9-25V with a max voltage of 35V and a tolerance of +/- .25V
Can't speak to the sender...but my experience with the L7806 shows them to be very stable regardless of input voltage/current...
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Cargo Master
Joined: Oct 2013
Posts: 2,580
Likes: 29
From: in a barn
what is the mustang sending unit ohm range E and F compared to the ohm range of the original F1 unit?
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Senior User
Joined: Sep 2012
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From: North Sewickley, PA
Well, I didn't make a video, but I did experiment with the ohms of both the sender and the gauge, the sender at empty is 74.5 ohms, full is 11 ohms. The gauge, well since I couldn't get an ohm reading while electric was supplied I applied 6 volts, disconnected it and immediately the only ohm reading was 11 ohms this was with the needle at full descending to empty. So this must be where the bimetal vs variable resister gauge comes into play. I had the l7806 voltage reducer hooked to a 12v battery. It supplied a constant 6v power to the gauge. This is pretty much all I'm going to do until the fuel tank is in. Then I'll do a video with water in the fuel tank at one gallon increments.
Fleet Owner
Joined: Jul 2004
Posts: 27,297
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From: NM
There is no ohm range for the original, it doesn't work on resistance.
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