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Cortina MK1 fuel sender.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Sun Jul 15, 2018 8:44 pm    Post subject: Cortina MK1 fuel sender. Reply with quote

Having issues with my Mk1 fuel gauge reading 1/4 tank all the time. Anyone know what the readings, ohms I believe, should be for sender unit reading empty and full? I have a spare but want to make sure it’s working before installing. Thanks.
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peteleo



Joined: 24 Aug 2008
Posts: 1017
Location: San Mateo,California

PostPosted: Mon Jul 16, 2018 8:06 am    Post subject: Reply with quote

aprox. 20 ohms ( full ) to ~ 200 ohms ( empty ).

Check the range with an ohm meter. Reading should increase and decrease steadily as you move the float arm up and down.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 16, 2018 9:09 am    Post subject: Reply with quote

Thanks Pete I’ll check
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Sun Jul 22, 2018 4:47 pm    Post subject: Reply with quote

So after taking it out again and checking I put it back in and at a full tank I’m getting half a tank showing on the gauge and approximately 40 ohms at the sender unit. I’m thinking a new sender maybe required, some on Ebay for about $100 cdn which is better than some nos at $500 AUD.........
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peteleo



Joined: 24 Aug 2008
Posts: 1017
Location: San Mateo,California

PostPosted: Sun Jul 22, 2018 4:57 pm    Post subject: Reply with quote

Lee,

It sounds like the wire wound resistor is worn. ~$100 for a new one is a good deal. Keep the old unit as they can be rebuilt.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 23, 2018 7:15 am    Post subject: Reply with quote

So here's a question for you Pete, it's been suggested that I may have a MK2 fuel tank and sender unit. Assuming that I have a MK2 sender and a MK1 gauge, are they different 'full' and 'empty' ohms readings? In which case a full tank may only give me a half full gauge reading? Pretty sad that these kind of questions keep me awake at night..... thanks.
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peteleo



Joined: 24 Aug 2008
Posts: 1017
Location: San Mateo,California

PostPosted: Mon Jul 23, 2018 7:58 am    Post subject: Reply with quote

Mk2 tank will fit in a MK1 but won't be flush with the trunk floor in other words it would bulge a bit.

The resistance range on all the senders are somewhat the same.
10 ohms -250 ohms to 20 ohms - 200 ohms. The sender and gauge should match otherwise the gauge will not read completely full or completely empty.

You are reading 40 ohms on a 1/2 full tank or sometimes a reading of 1/4 full would suggest that either the float has a small leak or the wire wound resistor is worn.

I know this suggestion won't be fun. Remove the sender from the tank ( shake the float to be sure there isn't any fuel inside ). Hook up the sender to the wire that normally attaches to the sender. Attach a ground wire to the sender body and to the car body. Turn the ignition on and move the float arm up and down, have someone watch the fuel gauge.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 23, 2018 11:42 am    Post subject: Reply with quote

Thanks for the tip Pete, if I was really smart I would have done the last bit of testing when I had the sender out over the weekend..... I did have a small hole in the float which I soldered up and then I filled the tank again, I guess it should be nearly empty by the weekend to remove it again. Do you know if the senders are all interchangeable Pete? I don't want to order one for, potentially, a MK2 tank and find that it doesn't fit.
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peteleo



Joined: 24 Aug 2008
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Location: San Mateo,California

PostPosted: Mon Jul 23, 2018 11:52 am    Post subject: Reply with quote

There are 3 types of sender units for the MK1 GT, deluxe, and SW. None interchangeable same for the MK2. Once removed send a photo and i might recognize it.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 23, 2018 12:26 pm    Post subject: Reply with quote

Will do thanks Pete.

Here’s a couple from yesterday, not too clear
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 23, 2018 12:29 pm    Post subject: Reply with quote

That measurement is 56.3mm by the way.
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peteleo



Joined: 24 Aug 2008
Posts: 1017
Location: San Mateo,California

PostPosted: Mon Jul 23, 2018 1:00 pm    Post subject: Reply with quote

I believe it's one of these: C5BH-9275C for the GT 10/64 on or 113E9275C
meant for the deluxe and Lotus Cortina and made by Smiths.

Photo of C5BH

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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 23, 2018 3:11 pm    Post subject: Reply with quote

Hmmm looks a little different, the ‘box’ with the resistor in is bolted directly to the back of the face plate on mine, didn’t know there was a number, I’ll check, I also have another spare which is also giving me some strange readings but visually is the same. Thanks Pete.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Mon Jul 23, 2018 8:52 pm    Post subject: Reply with quote

Ok I lied, it’s the first one you said there Pete , the C5BH. Took the thing apart agin, actually starting to like the taste of gas..... it looks in half decent shape but I get about 40 ohms full and about 120 empty. I’m guessing it’s shot.

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1970 cortina GT



Joined: 05 Dec 2013
Posts: 249
Location: Saskatoon, Saskatchewan

PostPosted: Sun Sep 09, 2018 7:07 pm    Post subject: Reply with quote

Any tips here will be welcomed. So I have installed a new sender unit and with a full tank I get 20 ohms but still get a reading on the gauge as half a tank? A little confusing, I tried a gauge out of a MK 2 and get the same reading so I’m pretty sure the gauge is ok. I thought it might be a problem with the sender being grounded inadequately, I put silicone between the tank and bodywork when I installed it to prevent any leaks, so I added another ground to the bodywork and one of the tank bolts but get the same result. Any suggestions?
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