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Author Topic:   Fuel gauge
CHRISWEIGHT posted 10-16-2005 03:12 PM ET (US)   Profile for CHRISWEIGHT   Send Email to CHRISWEIGHT  
trying to sort out a fuel gauge.
1, how is it wired is it in series?

2, sender ranges between 6 ohms to 300 ohms is there a standard or do I have to arrange some form of shunt across the meter I am trying to use an old smiths gauge.

I probably am not asking the right questions but clearly I don't have a clue.

regards chris

jimh posted 10-16-2005 11:28 PM ET (US)     Profile for jimh  Send Email to jimh     
Mention the YEAR, the MODEL, and the LENGTH of your BOSTON WHALER boat and you will get more cogent replies.
CHRISWEIGHT posted 10-17-2005 06:49 AM ET (US)     Profile for CHRISWEIGHT  Send Email to CHRISWEIGHT     

jim its somthing Im trying to cobble together its actually a lorry tank and sender that I want to use with an old smiths fuel gauge, its also dawned on me that It could well be 24 volt as the resistance range seems to be about double the norm.

regards chris

jimh posted 10-18-2005 10:30 PM ET (US)     Profile for jimh  Send Email to jimh     
The typical arrangement of an electrical tank level indicator is:

+12 volts ----->meter----->sender----ground

Refinements include isolating the ground return to go separately to the battery negative to avoid influence of other currents and regulating the supply voltage to improve accuracy.

The sender and the meter need to be matched with respect to how much current will flow at the "full" level of the sender.

CHRISWEIGHT posted 10-19-2005 08:35 AM ET (US)     Profile for CHRISWEIGHT  Send Email to CHRISWEIGHT     

thanks Jim had a real stroke of luck used a pot to simulate the empty and full readings on the gauge and they matched the sender within a few ohms, some days you just gotta get lucky . thanks again.

regards chris

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