Fuel Tank Sender
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=40987
Printed Date: November-16-2024 at 3:53am
Topic: Fuel Tank Sender
Posted By: winniskier
Subject: Fuel Tank Sender
Date Posted: May-01-2017 at 12:20pm
| My fuel gauge reads empty when the tank is 1/3 full, which is about 9 gallons of fuel.. I took the sender out of the tank to test it. The range and length of the arm correspond to the level in the tank. The float is about 1-2 inches from the bottom of the tank when the gauge reads empty. The float is near the top of the tank and the arm is horizontal when the gauge reads full. When I reinstalled the sender in the tank, it read 1/4 full when the tank was a little over 1/2 full. Any ideas how this could be? I don't suppose the float could have lost buoyancy. |
Replies:
Posted By: Gary S
Date Posted: May-01-2017 at 12:58pm
| Yes the float can absorb fuel and get heavier and the wiper can wear also. If you decide to change http://wemausa.3dcartstores.com/Fuel-or-Water-Level-Sensor-4--60-in_p_9.html? - these are the way to go. |
Posted By: Jonny Quest
Date Posted: May-01-2017 at 10:25pm
+1 |
Gary S wrote:Posted By: 8122pbrainard
Date Posted: May-01-2017 at 10:39pm
Jim, Getting Ohm readings with the VOM is best for testing. It sounds like you used the gauge to test so hopefully you don't have a gauge rather than sender problem. If you don't have a VOM, a basic one is around $20.00 They really come in handy troubleshooting electrics in the boat, car and even the house. Get a VOM and test the sender before assuming it's the problem and not the gauge. |
Posted By: 8122pbrainard
Date Posted: May-02-2017 at 9:10am
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Jim, If you do get a VOM and test the sender, the Ohm reading will be linear from about 33 to 240 with the 33 will be the empty reading. |
Posted By: KENO
Date Posted: May-02-2017 at 1:02pm
Pete I don't know what he has for a gauge setup but your numbers are backwards for a 33 to 240 ohm gauge. 33 ohms would be full and 240 ohms would be empty on American applications, it's an industry standard If you ground the sending unit with the key on, the gauge should go to full. |
Posted By: 8122pbrainard
Date Posted: May-02-2017 at 1:43pm
Ken, Yup, you are correct. I'm backwards this morning!  In any case, as mentioned, getting the VOM out to testes the sender only. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Air206
Date Posted: May-02-2017 at 1:55pm
That sounds uncomfortable........... and +4 on the WEMA sender - Mention my name and CCFan to WEMA and there might be a discount....(it was an old promotion for CCFan buy). ------------- https://tinyurl.com/y6t5e3bu" rel="nofollow - 04 Air206 http://tinyurl.com/9urzgls" rel="nofollow - 91 Barefoot 78 SkiTiq |
Posted By: winniskier
Date Posted: May-02-2017 at 5:21pm
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I hear what you are saying regarding VOM testing the sender. However, the sender operated properly when it was outside the tank. Doesn't that confirm what VOM testing would confirm? What would cause the difference is performance of the sender inside vs outside the tank other than the float? ------------- Jim |
Posted By: KENO
Date Posted: May-02-2017 at 5:46pm
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You've never mentioned whether this is something new or if it's always read wrong. Here are some instructions for a Moeller universal fuel sender that probably resembles yours . https://www.jamestowndistributors.com/userportal/document.do?docId=1105" rel="nofollow - instructions If it's never been right, you probably need to follow the section on adjusting floating arm length based on the depth of your tank. Not quite related to this but it would be nice if you started your threads with some info like what boat you're talking about, it makes it easier to get help 
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Posted By: Air206
Date Posted: May-02-2017 at 6:27pm
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Swing arm floats in a boat vary quite a bit. The reed switch WEMAs are the way to go. Since it is out (which can be a pain to do), replace it with a less variable, bullet-proof one. All done and it will measure as you expect. They swing arm styles have way too much potential for fussiness. ------------- https://tinyurl.com/y6t5e3bu" rel="nofollow - 04 Air206 http://tinyurl.com/9urzgls" rel="nofollow - 91 Barefoot 78 SkiTiq |
Posted By: KENO
Date Posted: May-02-2017 at 6:35pm
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Here's a thread from last year about the reed switch senders. I have one that's decently accurate like Air206's., Looks like JQ's wasn't so accurate. http://www.correctcraftfan.com/forum/forum_posts.asp?TID=39880&title=fuel-sending-unit-help" rel="nofollow - thread |
Posted By: Jonny Quest
Date Posted: May-03-2017 at 12:17am
The accuracy of mine is not the sender, but rather the fact that the specific unit I got should really be 1 inch longer. Then, the accuracy would be fine. It reads about 1/4 "off" because of the 1 inch too short issue. JQ ------------- Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
Posted By: winniskier
Date Posted: July-09-2017 at 5:40pm
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I am planning on buying a new WEMA sender. The tank measures 11.8 inches on the outside. An inside measurement is not feasible. Anyone know the length I should get for my '97 Nautique? ------------- Jim |