Fuel tank sending unit replacement |
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uncle-buck
Senior Member Joined: June-14-2004 Location: United States Status: Offline Points: 331 |
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Posted: November-20-2024 at 11:09pm |
I want to replace the fuel tank sending unit in my 90 SN. The fuel gauge itself has been tested and appears to be good
The replacement sending unit has only two wires, but the gauge has three wires. How can I find out how to connect the new sending unit to the old three wire fuel gauge? |
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11133 |
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uncle-buck
Senior Member Joined: June-14-2004 Location: United States Status: Offline Points: 331 |
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KENO, I purchased a KUS reed type sending unit which is scheduled to be delivered tomorrow.
Read the thread you linked, but am still not clear on what to do with the third wire from the fuel gauge or dashboard. Thanks, as always, for your help. |
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11133 |
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Here's a non artist's rendition of the back of a fuel gauge You'll have A terminal marked "I". It gets 12 volt power when the keyswitch is in the Start or Run position (purple wire) A terminal marked "S".It runs between the sending unit and the gauge (pink wire) A terminal marked "G". )Black wire) It goes to ground and to the black wire at the sending unit You need those 3 wires for the gauge to function, the blue wire is just for the gauge light. The terminals are marked on the gauge housing and can be in different positions than the drawing, so look for the markings So you hook the black and pink wires to the new sending unit wires and with the gauge wired like this, it should work. |
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uncle-buck
Senior Member Joined: June-14-2004 Location: United States Status: Offline Points: 331 |
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Much appreciated, Ken.
I connected the pink wires to each other and the green and black wires from the gauge to the black wire on the sending unit. Back in business... |
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11133 |
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The green wire doesn't come from the gauge or have anything to do with reading fuel level
You'll find the other end of the green wire hooked to the gas fill connection. It's hooked to one of the machine screws holding your fill connection to the deck of the boat and it just shares a ground connection with the sending unit. It grounds the fill connection to dissipate any static electricity while you're filling the tank to minimize the chances of an explosion |
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uncle-buck
Senior Member Joined: June-14-2004 Location: United States Status: Offline Points: 331 |
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Good to know - and thanks again for your help.
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 11133 |
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Here's something else that's good to know in the quote below from an old thread
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uncle-buck
Senior Member Joined: June-14-2004 Location: United States Status: Offline Points: 331 |
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I think I saw that post a few months ago in some search results.
Ended up with a KUS reed type sender which will be fine for my purposes. |
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1990 Ski Nautique (original owner)
PCM 351W with D.U.I. |
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