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Fuel Tank Sensor Replacement |
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pdc78 
Commander 
Joined: 27 May 2016 Location: UK Status: Offline Points: 142 |
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 Posted: 28 April 2021 at 06:10 |
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I cut a fresh hole and used a Wema threaded flange on the underside. No sealant used, just the rubber washer which came with the sender, then carefully tightened the screws using opposite sequences, then again and again. So far no leakage (fingers crossed!)
Regards, Paul
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H345 #269
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Fendant
Admiral 
Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671 |
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Posted: 28 April 2021 at 17:55 |
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Correct, I used nuts and washers from the inside, its an easy fit
through the inspection hole and a rubber seal on the outside. So far ( 6 years ) its watertight
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Frank
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richz
Captain 
Joined: 02 September 2013 Location: Milan Status: Offline Points: 242 |
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Posted: 28 April 2021 at 19:42 |
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same here: no Sikaflex the rubber seal is good enough.
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Amygdala
Sub Lieutenant 
Joined: 10 September 2023 Location: Norway Status: Offline Points: 2 |
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Posted: 24 July 2025 at 14:39 |
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Hi Fendant,
I notice in your post that you had the same problem as I probably have in my 385/2014. The tank installation seems equal at least for the sensor in the polypropylene tank. What I am asking is what happens if I unscrew the five fastening screws? Will nuts and washers then disappear to the bottom of the tank or are the screws threaded into integrated threads in the polypropylene?
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Fendant
Admiral
Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671 |
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Posted: 26 July 2025 at 13:19 |
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Hello Erik,
I assume that you mean the black HDPE fuel tank. This one has a molded in flange with threaded inserts. I have attached a photo for your convenience,  |
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Frank
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Amygdala
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Joined: 10 September 2023 Location: Norway Status: Offline Points: 2 |
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Posted: 06 August 2025 at 22:17 |
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Hi Frank,
Thank you so much for your answer and assurance about the threaded inserts. Tonight I opened the tank and luckily diesel consumption was enough for the level to just be in line with the gauge opening. If it had been above, I would have had a terrible mess to clean up. My gauge seems however to be working just fine, bearing in mind that there is a considerable volume Ğaboveğ the gauge flange to be consumed before a change in the reading may be possible.
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Fendant
Admiral
Joined: 03 November 2012 Location: Switzerland Status: Offline Points: 1671 |
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Posted: 07 August 2025 at 17:31 |
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Erik, I never fill the diesel tank above 90%.
My 1st fill up at 100% resulted in diesel smell for weeks, since then at 90% no problem Happy Sailing
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Frank
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