[Healeys] fuel gage sending unit

[John Spaur]

There a couple of issues that the list did not address.

 

1. The windings on the resistor in the sending unit are not as close as an
original sending unit and some sending units only have one contact point. I
believe the Moss Gold unit has corrected this issue. This could cause the
erratic behavior. However the main reason is most likely:

2. The magnetic coils inside the gauge control the full to empty range. They
are hard to adjust even if you send the gauge to a shop to have it
calibrated. I have not been able to resolve this issue. I think it is
because the coils are out of plumb with respect to the pickup within the
gauge due to adjustment wear over the years.

 

I can't find the MG site that has more information about this issue but the
picture below show the coils and pickups. You can adjust the coils by
loosening the nuts on the back of the case but when the nuts are tightened
the coil calibration is affected. I have never successfully calibrated the
gauge so it works correctly. By the way, be forewarned if you decide to
disassemble the gauge it is a very delicate process and you could break the
needle or the very fine coil wires.

 



 

John Spaur

'62 BT7

 

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Ron Fine
Sent: Saturday, September 28, 2019 9:31 AM
To: Healey Mailing List <healeys at autox.team.net>
Subject: [Healeys] fuel gage sending unit

 

 

Due to a leak around the fuel sending unit I needed to remove the unit and
decided to replace it with a new one from Moss Motors.  The one I was
removing was at least 12 years old but it did keep fairly accurate track of
the fuel level.

 

The new one seemed to work OK for a few hundred miles, but now it does not
move off the full mark until the tank is more than 50% empty.  I have
carefully checked all the wires and grounding connections and everything
looks clean and tight.  The gage swings from empty to full when powered up
so I doubt the gage is the problem.

 

Any suggestions on what to look for now?  I have not removed the unit yet.

 

Are there any "better quality" sending units available on the market?

 

Thanks,

Ron Fine

61 BN7

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