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Post Info TOPIC: Fuel Sender


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Fuel Sender


Is the regular TR3 sender a direct replacement for the Peerless tank?  I'm guessing it's maybe just a differently bet arm, but thought i'd check before ordering a replacement.  The existing one is kaput

dave



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Dave GT2 



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On the Warwick I found that it was not. It was clocked differently so that required a little arm bending so it would swing lengthwise in the tank. Also you had to shorten the arm - neither too difficult. Looked like the factory did the same by cutting the arm and wrapping it with wire and solder. After I finished it read backwards (empty vs full) so that meant moving the arm to the other side... I guess I bent the arm the wrong way. I recall I had to rethink that bend a few times. An ohm meter helped, as did hooking it up to the gauge and watching it go from empty to full.

You can get it to work, but plan on fiddling and soldering. I have a new one here from Moss for the Peerless if you want to take a look. It is Moss Part number 763-020.

Dean

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59' Peerless #213, 61' Warwick GT, 60' Healey BN7, 70' Lotus Europa, 87' Lotus Esprit Turbo HCI...



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Thanks, Dean. The TR4 unit looks exactly like what came out, as best the catalog shows, but then so does the 763-000 fo rthe TR3. Other than the 763-000 being more expensive, i wonder what hte difference is? With the existing kaput sender, it should be easier to match the necessary arm travel.

dave

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Dave GT2 



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Dave,

It looks like I started with the wrong part.  Moss part 763-000 is much closer to the original.  I'll use those for the Peerless.  Thanks for bringing this up!

Dean (now back to fiberglass work)



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59' Peerless #213, 61' Warwick GT, 60' Healey BN7, 70' Lotus Europa, 87' Lotus Esprit Turbo HCI...



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I think I've found the difference between the 763-020 and 763-000, namely the resistance is opposite. The TR3 763-000 has low resistance on empty and high resistance (~90ohm) when full, and the 763-020 is opposite. This fits with your arm bending I guess

Dave

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Dave GT2 



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which explains why I have one reading backwards as well! bugger....which one do I need again?confuse



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According to my research, and to be tested when parts arrive....

Moss part 763-000 is correct for the TR3 fuel gauge. On empty, the sender has approx zero resistance and on full has approx 90 ohms.

There are many other parts being sold as for a TR3, but most either won't fit, or are quoted as fitting both TR3 and TR4 in which case the resistance sequence is off. Caveat Emptor.....

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Dave GT2 



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I dug out the left fuel tank sender...

Full 90 ohms

Empty 6 ohms

Sorry Nigel.  You have one TR4 sender.cry

Cheers?

John



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And here is the Moss part alongside what came out.  I'm a bit disappointed that it's not the same type as the original, but the fact is that it will fit, and it's resistance profile fits the research above and exactly what John's shows.    Anyway,  with a slight straightening of the arm, it should work well.

dave



-- Edited by DaveC on Thursday 12th of September 2013 08:14:31 PM

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