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Old 07-14-2017, 11:05 AM   #1
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Default Fuel Sending Unit

Is there any way to measure for a new sending unit without pulling out the existing one. I want to order a WEMA SSS/SSL unit but need the length. I think I can maybe get the outside height. Thanks
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Old 07-14-2017, 11:30 AM   #2
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NO, bite the bullet and pull the FSU, then measure the depth at that point.
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Old 07-14-2017, 12:07 PM   #3
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He's right. Have to pull the old sender then measure the depth of the tank, then deduct 1".
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Old 07-16-2017, 08:10 PM   #4
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Gonna have to pull it anyway...
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Old 07-17-2017, 05:59 AM   #5
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Buy a more advance fuel quantity sender than the Wema type and you can cut it yourself to length. However far off the bottom of the tank that you want it to be. 1/4", 1/2", 3/4" ...

With the old sender out just measure the distance from the bottom of the top mounting surface to the bottom of the tank. Subtract from that the amount of clearance you want from the bottom. Cut the sender to length.

All solid state. No moving parts. www.centroidproducts.com
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Old 07-17-2017, 07:58 AM   #6
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Hello, I had good results with an ultrasonic sender unit, I think that was made by Wema as well, no need to pull the sender, the bolt pattern is universal, the ultrasonic units have 3 wires instead of 2, the third is an ignition 12V source, I took the feed from the same feed as the dashboard gauges, you can use the exciter wire from the alternator too (I think a lilac cable), hope this helps.
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Old 07-17-2017, 08:09 AM   #7
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If you have access to the tank, can measure the height. You can ask the boat manufacturer. If the tank has a label on it, you can ask the tank manufacturer. Are you sure it's the sender that's bad and not something else like a faulty ground?
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Old 07-17-2017, 08:15 AM   #8
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The gauge works. Just jumpy. I'll live with it for now. There actually is a label on the tank. The boat is 20 years old. Chaparral is no help.
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