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Anyone had issues with aftermarket fuel senders? (1974 D100)

 
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silverhead
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Joined: 01 May 2017
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Post subject: Anyone had issues with aftermarket fuel senders? (1974 D100) (Tue May 16, 2017 3:07 pm) Reply with quote

Based on seemingly only two options for replacement fuel senders for my D100, I opted to buy a stainless steel aftermarket one on ebay for 100 bucks. Mine had disintegrated into brown dust.

The ebay sender showed up and I measured resistance on the bench to make sure it worked. When the float was set to 'full' I got a reading of 9.8ohms. At about the 1/2 way mark I read 45 ohms. When the float was set to empty I registered 80 ohms. This is fine. I think Chrysler stuff is supposed to vary from 10-73 ohms based on fuel level.

So I drained the worst varnish ever from my 18 gallon plastic fuel tank in my D100 (such a horrible job) and removed what I could find of my original sender. I installed this new sender without any drama. I filled my fuel tank up all the way and dumped a bit of Seafoam in there to help the gasoline not get funky from the old stuff that was in there. My truck runs fine.

Except that my fuel gauge always registers Empty.

Out of curiosity I jacked up the bed and got under there and pulled the wires off of the screw stud connections. I checked resistance on a full tank of fuel and got a reading of 77 ohms. This would make sense as to why my fuel gauge registers E.

Just to verify my results, I hooked a 7 ohm resistor that I dug out of my garage parts between the factory fuel gauge wires and turned on the ignition. Sure enough the fuel gauge shot up to Full.

I asked the ebay seller if they've ever had issues and they replied that they have not. I'm just curious if any of you have experienced issues with these generic senders? 100 bucks is a lot of coin for something that I feel is worth about 25 bucks on any day of the week for several other makes/models of cars. I'm going to do the annoying thing and remove my pickup bed again and pull the sender out and re-check it on the bench. I'm just curious if any of you have dealt with this before? Thanks!


Here's a photo of what I bought.



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afastcuda1970
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Joined: 03 Aug 2015
Posts: 82
Location: Dallas Texas

Post subject: (Tue May 16, 2017 3:22 pm) Reply with quote

I put one of those $100 e-bay sender in my '85 D-250 with a 30 gallon tank and it works fine.



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1976 Feather Duster /6 4sp
1984 W100 /6 np435 np208
1972 'Cuda 340 4sp
1985 D250 360 46RH
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emsvitil
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Joined: 12 May 2005
Posts: 5701
Location: So California

Post subject: (Tue May 16, 2017 3:47 pm) Reply with quote

Did you ground the sender?



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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes
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DusterIdiot
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Joined: 29 Oct 2002
Posts: 9825
Location: Salem, OR

Post subject: x2 (Tue May 16, 2017 4:35 pm) Reply with quote

Quote:
Did you ground the sender?


Yep... that happens everytime on a replce, forget to put the clips back in place, replace the old rusty one, or don't clean off the place where it goes to get good contact.


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silverhead
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Post subject: (Tue May 16, 2017 4:50 pm) Reply with quote

Yep I have a clean ground. 0 ohms measured to the frame. The 7ohm test circuit I hooked up was the same as what's hooked to the sender.


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afastcuda1970
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Joined: 03 Aug 2015
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Location: Dallas Texas

Post subject: (Tue May 16, 2017 5:34 pm) Reply with quote

I tested mine before I installed it by hooking up both wires and manually moving the float. The gauge moved accordingly. Check the gauge or test with a spare gauge to make the gauge is good.



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1976 Feather Duster /6 4sp
1984 W100 /6 np435 np208
1972 'Cuda 340 4sp
1985 D250 360 46RH
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silverhead
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Post subject: (Tue May 16, 2017 6:04 pm) Reply with quote

I'm just bummed that I have to jack the box up again and get in there and pull it out so I can see what's up. I hope the float hasn't taken on fuel or something.


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DusterIdiot
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Post subject: No, but... (Tue May 16, 2017 6:56 pm) Reply with quote

Quote:
I hope the float hasn't taken on fuel or something.


Sometimes you do have to bend the arm to get it to read the correct level.
I used to have a spare tank for an A-body that must've taken a direct fall on a jack... just cut a nice window in the top, banged it back out, and used it to properly set the float and arm reading when filled with liquid. Much better than setting it and finding out that 1 less gallon than full is 3/4, or that 1/4 is really 1 gallon from E....

If worried about the float being tanked, you can do like the old school carb rebuilders and let the float sit in a cup of gas for 24 hours and see if it sinks or has taken on any liquids...


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