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Re: Can I test fuel sender unit on my 53 Merc?

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05-07-2013 08:50:40

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I disconnected it and the two tabs which go to the top of the sender unit were very badly tarnished - once disconnected the fuel gauge stayed at E once cleaned up and re-connected the gauge went to just below F - looked inside the tank filler and the tank is full to the top - going to drive it around a while to get the fuel level down and see if it changes the needle position - it appears to have stopped the up and down movement now the connectors have been cleaned.

The two tabs were not separated by anything like a spacer - I assume it is ok for the two wires to be contacting like that? I would assume that if they are touching it is going to show full no matter what?

Two days of fairly heavy welcome rain here cleared out all the pollen and dust thank god.


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05-07-2013 09:27:24

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 Re: Can I test fuel sender unit on my 53 Merc? in reply to Britcheflee, 05-07-2013 08:50:40  
I am not quite sure what you are describing to me.

Normally there are two types of fuel senders: one with one terminal that gets the circuit return through the body of the vehicle and one with two terminals that has a wire both for the gauge and the ground return.

If your sender is a two wire type and the two terminals are shorted, you will get a F indication.

What I would do is use an ohm meter to read the resistance between the two terminals OR the one terminal and ground and move the pointer. If the resistance changes smoothly with no sudden changes the sender is probably good. If it swings back and forth suddenly, I would try and clean the sensor reostat.

Good luck!


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05-07-2013 10:30:18

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 Re: Can I test fuel sender unit on my 53 Merc? in reply to Cliff(VA), 05-07-2013 09:27:24  
I will send a pic if possible but pouring with rain at moment.

this one has a single connection right in the middle at the top - there is one wire which comes from somewhere from the rear of the car (which I tested and supplies power) with a round tab on it and one which goes from the connection via that suppressor and is connected to one of the screws which hold the sender in place (so I assume grounded) - both wires were connected to the middle of the sender by a single screw with no spacer in between - for some reason I cant see how this could work as surely there needs to be a spacer between the two so they don't contact and just ground out? Maybe that is why the gauge reads full all the time?

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05-08-2013 13:23:57

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 Re: Can I test fuel sender unit on my 53 Merc? in reply to Britcheflee, 05-07-2013 10:30:18  
Based on the picture you posted elsewhere, you have a "one wire" fuel sender.

The wire feed going to the meter supplies power (excitation) as well as providing a signal to the meter. The other lead to the "suppressor" filters the sender so that the gauge does not bounce around alot.

I think your problem is with all the rust on the tank. It is not getting good ground connection back to vehicle ground. My suggestion is to pull one of the screws that holds the sender in the tank. Clean it "clean bright and tight. Slip a wire with a ring terminal under it before you replace it. The other end of the wire should go to somewhere on the frame of the vehicle with a "clean, bright, and tight" connection.

If that does not fix it for you, I would remove the sender from the tank and try the proceedure I outlined above.

If you need more help my cell is five four zero, three three six, three two seven four.


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