3 replies to this topic

[matt68]

Hi,

Just wondering if anyone happens to know the specifications (resistance Empty and Full) for the Smiths Fuel Gauge as used in the late 60's minis?

Cheers
Matt

[matt68]

Hi,

Just wondering if anyone happens to know the specifications (resistance Empty and Full) for the Smiths Fuel Gauge as used in the late 60's minis?

Cheers
Matt

I believe it is 20 Ohms full and 240 Ohms empty. Just trying to get my facts straight!

[dklawson]

Assuming you meant the sending unit resistance, Matt68 is correct. I've never measured the gauge's resistance.

For what it's worth... the 20-240 ohms range is nominal and will vary by as much as 10 ohms or so on each end of the scale from sender to sender.

[matt68]

Assuming you meant the sending unit resistance, Matt68 is correct. I've never measured the gauge's resistance.

For what it's worth... the 20-240 ohms range is nominal and will vary by as much as 10 ohms or so on each end of the scale from sender to sender.

Thanks dklawson! I meant the sender unit resistance! For what it is worth I found your PDF on adding resisters to get the sender and gauge working in unison! Very informative, I have printed it and it is now in my workshop manual supplement pages

I now need to know how to check the voltage stabiliser, so after a search, I'll post a new topic!

Oh, and the sender in the tank measured 237 Ohms empty and 25 Ohms full, so I know it is working within reason!