Fuel Guage Problem

[sailsmanship]

Fuel Guage was working fine last year. Trailered it to the marina to put in the water, guage said 3/4 full. topped it off before putting it in, said full. Went fishing twice this week and should have ran about 20 - 25 gallons out of the tank. It still reads full. Could it be a float that became stuck at the top ? The connections at the top of the tank are clean and have no corrosion on them.

 

[ricksrster]

Re: Fuel Guage Problem

Your gauge must be reading full voltage all the time. <br /> To test gauge usung a multi meter your ignition + to ground should be 10 - 16 v. Remove the sender wire, probably pink color, from the gauge. The gauge should read below empty. <br /> Now add a short wire between sender terminal on the gauge. to ground. The gauge should read past full.<br /> If these two test pass, then gauge is good. <br /> Now we test the pink wire and the sender. If the sender or the wire is shorting out, you will read full all the time. <br /> Remove the sender from the tank. Remove the sender wire from the sender. Connect multi meter set to OHMS to sender terminals or one to sender, one to flange if only one terminal. Some senders might be grounded to tank.<br /> Move the sender arm Empty should be 240 ohms; 1/2 should be 103 ohms; full should be 33 ohms. Resistances may vary by different manufacturers. <br /> If the sender checks out, you have a wiring problem and need to rerun a new sender wire from sender to gauge.

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[ricksrster]

Re: Fuel Guage Problem

 

[Texasmark]

Re: Fuel Guage Problem

The biggest problem with fuel system monitors is the mechanical abraision caused by the wiper of the sender (attached to the float) wearing out. Especially in boats and farm tractors, the constant agitation of the tank keeps the arm moving all the time and they either wear through the wire, or wear the wiper off.<br /><br />John Deere came up with a ceramic package that had silver deposited on it (like the substrate that integrated circuits are mounted in) with a wide wiper, which is really a heavy duty unit and should last a long time. <br /><br />If you replace the sender, the 240-33 ohm systems are pretty standard, but the sender's at your local auto parts store are for cars, not marine/ag use. They'll last one season, maybe. <br />BTDT<br /><br />Go to a marine supplier.....bet they have them on this site.<br /><br /><br />Mark

 

[sailsmanship]

Re: Fuel Guage Problem

Thanks for the great info ....