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TOPIC: WEMA sender for diesel

WEMA sender for diesel 27 Jul 2017 18:51 #1

  • Sunnydude
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I am going to replace the senders in my fuel tanks with WEMA. As we all know the 38xx tanks are not rectangular. I have emailed WEMA to see what they recommend (custom request form) and they need me to tell them if we have an American version or European version guage. Basically if the guage is disconnected it is at empty, ground the guage and it goes to full would be american. Do you think it is safe to say it is?

On a side note I did some calculations and believe a 13" sender would be the closest to being accurate as I believe due to the shape it would be accurate. Anyone calculated?

Thanks.

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Sean
1987 3870
Crimson Pride II
Past Commodore Mukilteo Yacht Club
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WEMA sender for diesel 27 Jul 2017 21:53 #2

  • floatyerboat
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You lost me on this one. I've driven European cars and the gas gauge says empty, 1/4, 1/2, 3/4 and full just like the US. Unless you have a digital read out gauge I would think WEMA's rule of thumb measure the tank depth and subtract 1 inch would work just fine.

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Dan
Frostbite Falls, Minnesota
Claudia V. III
1988 - 3218
Gas Drives

WEMA sender for diesel 27 Jul 2017 22:56 #3

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floatyerboat wrote: You lost me on this one. I've driven European cars and the gas gauge says empty, 1/4, 1/2, 3/4 and full just like the US. Unless you have a digital read out gauge I would think WEMA's rule of thumb measure the tank depth and subtract 1 inch would work just fine.


You would think so on the guage but I doubt the rule of thumb holds due to the tank sloping over 42" of width from 17" deep to 6".

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Sean
1987 3870
Crimson Pride II
Past Commodore Mukilteo Yacht Club
MMSI: 338080226

WEMA sender for diesel 27 Jul 2017 23:33 #4

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That changes it quiet a bit. I was thinking rectangular, square or round tank. I am interested to know approx. where the hole is along the slope where the sender goes in.

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Dan
Frostbite Falls, Minnesota
Claudia V. III
1988 - 3218
Gas Drives

WEMA sender for diesel 28 Jul 2017 04:24 #5

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floatyerboat wrote: You lost me on this one. I've driven European cars and the gas gauge says empty, 1/4, 1/2, 3/4 and full just like the US. Unless you have a digital read out gauge I would think WEMA's rule of thumb measure the tank depth and subtract 1 inch would work just fine.


The manufacturer was trying to find out if the gauge shows full at zero ohms or infinity ohms. Not which orientation F vs. E was.

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WEMA sender for diesel 28 Jul 2017 11:44 #6

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Interesting stuff.

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Dan
Frostbite Falls, Minnesota
Claudia V. III
1988 - 3218
Gas Drives

WEMA sender for diesel 28 Jul 2017 13:28 #7

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Be advised that the sender for a single gauge is different than the sender for two gauges (ie upper and lower helm). I ran into this problem with my 3587 and ended up disconnecting the gauges on the upper helm.


Ron

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Midnight Star
1996 3587
Twin diesels, Hino 250's
Ladysmith, BC
History: 1996 - 2655, 2001 - 2855, 1984 - 3270

WEMA sender for diesel 28 Jul 2017 15:12 #8

  • ksanders
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If it were me, I'd keep it simple and just go with depth, while having a understanding of the tanks geometry.

If you want to get really complicated you could draw out the tank in 3-D, and experiment with different height senders until you get something that better reflects tank volume vs just fuel height in the tank.

Me... I like simple. I'd go with fuel height measurement, and know that full means full, 1/2 means X gallons etc... Keeping in mind that few prudent mariners operate their boats under 1/2 tank very long.

For us, we operate in the full to 1/2 tank area quite a bit, and only go lower on a planned long trip of a known distance.

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KEVIN SANDERS
4788 LISAS WAY
SEWARD, ALASKA
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Last Edit: by ksanders.

WEMA sender for diesel 28 Jul 2017 16:16 #9

  • Jim Gandee
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Sean,
I have no idea of the cost to replace the fuel senders but when/if you do the expense gives you no upgrade and you still only have a very general idea of the amount of fuel in the tanks. If you plan to keep your boat, use it often and for any distance I'd strongly consider the addition of Floscans. Not only will you always know how much fuel you have in each tank but you'll be able to compute your best efficiency (read best speed for fuel use) which will save you money in the long run!

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Jim Gandee
1989 3888
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WEMA sender for diesel 28 Jul 2017 23:14 #10

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+1 on FloScans

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Mark
USCG OUPV
1990 4588
Carlsbad, CA
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