trouble with fuel sending unit

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Nov 6, 2018 | 06:51 PM

workingdog

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trouble with fuel sending unit

I have a 2001-ish 6.0 liter in a 1966 LandCruiser. A shop recently installed a nice new gas tank with a combo fuel pump/sending unit for a 2012 camaro. The included an ohm converter unit to mate the output of the stock GM sending unit with the Autometer Gauge I have but did not have a chance to set it up. Now I'm struggling to get it all to work. Right, I'm getting

Full 70 ohms
About half 125 ohms
Empty 175 ohms

Off the sending unit before it gets to the conversion box. Before I got to the trouble of pulling the seats and pulling the pump assembly, I was wondering this those numbers make any sense to any - as the sending unit should be 80 - 240 ohms.

From what I can find the plug on the pump is wired (looking at the pins on the pump connector)

B C D A
+12 v - GND for pump - GND for sending unit - sending unit signal.

Thanks
Peter

Nov 6, 2018 | 07:04 PM

G Atsma

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From: Central Cal.

The sending unit might have that range, but in the tank it might not be swing a full arc in either direction.

Nov 7, 2018 | 10:37 AM

workingdog

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But, it's going the opposite direction of a stock unit.

Nov 7, 2018 | 10:45 AM

G Atsma

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From: Central Cal.

Is it possible the pivot point of the arm is upside down?
Or the wrong sending unit for that gauge. It's working opposite of what it should.

Nov 8, 2018 | 12:24 PM

ryeguy2006a

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From: Ruckersville, VA

I just did an OHM test this weekend using a 2011 5th gen fuel level sender and the right ohms are 250 Empty / 40 Full.

Nov 8, 2018 | 12:44 PM

G Atsma

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From: Central Cal.

So the sender is good. I wonder if Autometer makes a gauge that works opposite of the present one?

Nov 10, 2018 | 04:40 PM

workingdog

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So, I figured it out. Even though The FuelLink website and quite a few other websites indicate that since 1998 that GM fuel sending units are 250-40. But, after a lot of searching, I found a post that said that in 2014 GM switched from 250-40 to 40-250 - same values, opposite direction. And I have two new units that confirm that. Unfortunately, the FuelLink presents don't include post 2014. So, it's lucky I had it out to figure all this out as the FuelLink had to be manually programmed. But, it all seems to work now.

And, for anyone that doesn't know, FuelLink is a little box that can translate from any ohm range sender to any gauge.