Fuel Sending unit

[crowhater]

I bought a 50 gal diamond back fuel tank from Diamond back. The tank has an electric sending unit. They told me they use Autometer Phantom gauges and this is the gauge I have also. I hooked up the tank on Sunday and my fuel gauge reads past full. The tank has a little more then a 1/4 in it. I know my gauge works because if I cross the wires the gauge goes to empty. I think the sending unit has a diffrent ohms rating but I do not know how to figure this out. If I knew I could solder in a resistor.

 

[Joe]

Call diamond back they will help you,good people,

 

[crowhater]

I called diamondback today and they are good people but other hen remove the sending unit they had no other advise.

 

[COLD]

As far as I know their is 3 different senders, 73, 90 and 240 ohm. I checked Autometers website and Could not see any information as far as the sender resistance their gauge is supposed to work with. Just a long spiel about checking it. Bla Bla. GM uses 90 ohm and Ford and Chrysler use 73 and if memory serves correct, when you ground the sender wire, one will go to full and the other will go to empty and opposite if wire insulated from ground. Sounds like you have the wrong sender for the gauge. Check the resistance with an ohm meter. Is there a part number visible on the sender? brand name? :?

 

[crowhater]

As far as I know their is 3 different senders, 73, 90 and 240 ohm. I checked Autometers website and Could not see any information as far as the sender resistance their gauge is supposed to work with. Just a long spiel about checking it. Bla Bla. GM uses 90 ohm and Ford and Chrysler use 73 and if memory serves correct, when you ground the sender wire, one will go to full and the other will go to empty and opposite if wire insulated from ground. Sounds like you have the wrong sender for the gauge. Check the resistance with an ohm meter. Is there a part number visible on the sender? brand name? :?

I am going to remove the sending unit to see if there are numbers on the under side. I will try to check the Ohms with my meter. If all of this does not work I will add it all to my pile of of airboat parts and replace them. Thank you very much for your help

 

[crowhater]

OK the DiamonBack's fuel gauges are 200760-40 for the carbon and 200760 for the Phantom autometer fuel gauges. These gauges are 240-33 ohm gauges. I had to buy a 5716 Autometer gauge to use the sending unit in their tank. The only diffrence between this gauge and their Phantom gauge is the Bevel color and the needle color.


The important thing is that they use a 240-33ohms sending unit if you ever buy a tank from them.

 

[T-REX]

crow wouldnt it be better to change the sending unit than to have your gauges not match? not sure wich would be less expensive ,something to think about.

 

[crowhater]

crow wouldnt it be better to change the sending unit than to have your gauges not match? not sure wich would be less expensive ,something to think about.

I bought a matching gauge that will work with the tanks sending unit. I will put my old gauge with the other sending unit on a shelf.