robbio c Posted May 15, 2020 Report Share Posted May 15, 2020 Evening folks I have this week fitted a new fuel sender in my diesel tank and when I powered it up it is reading backwards .The tank is empty and it's reading full so I took out sender and moved the float manually to full and it reads empty .it's a simple 2 wire sender and yes the sender is matched to guage 0-190 ohms. Any ideas on correcting this much appreciated .this is the sender Link to comment Share on other sites More sharing options...
mrsmelly Posted May 15, 2020 Report Share Posted May 15, 2020 switch the wires round? 2 Link to comment Share on other sites More sharing options...
matty40s Posted May 15, 2020 Report Share Posted May 15, 2020 Just now, mrsmelly said: switch the wires round? Not much gets past you is there. 1 Link to comment Share on other sites More sharing options...
robbio c Posted May 15, 2020 Author Report Share Posted May 15, 2020 First thing I tried same out come unfortunately Link to comment Share on other sites More sharing options...
Sea Dog Posted May 15, 2020 Report Share Posted May 15, 2020 Mount the gauge upside down then... Link to comment Share on other sites More sharing options...
robbio c Posted May 15, 2020 Author Report Share Posted May 15, 2020 Just now, Sea Dog said: Mount the gauge upside down then... Which would require fitting to bottom of tank ,doesn't sound right to me Link to comment Share on other sites More sharing options...
system 4-50 Posted May 15, 2020 Report Share Posted May 15, 2020 Measure the resistance to confirm you have the sender you think you have. Link to comment Share on other sites More sharing options...
matty40s Posted May 15, 2020 Report Share Posted May 15, 2020 Try sticking it in a FULL container to see if it works properly when submerged. Link to comment Share on other sites More sharing options...
robbio c Posted May 15, 2020 Author Report Share Posted May 15, 2020 Ok thanks guys will try that out tomorrow and let you know Link to comment Share on other sites More sharing options...
WotEver Posted May 15, 2020 Report Share Posted May 15, 2020 1 hour ago, robbio c said: First thing I tried same out come unfortunately Switch pos and neg on the gauge. Link to comment Share on other sites More sharing options...
Tracy D'arth Posted May 15, 2020 Report Share Posted May 15, 2020 Use a mirror to read the gauge? Gauge should read empty with no sender connected and full with the connection shorted to the negative. I think its the sender but why is another question. Link to comment Share on other sites More sharing options...
Detling Posted May 15, 2020 Report Share Posted May 15, 2020 They work by the level varying a resistance so whichever way round the wires are it will be the same. If you are lucky the gauge will have a little switch or setting to use a low resistance full/high empty type, or high resistance full/low empty type sender. If not you need a new sender of the correct type or a new gauge. There are also two resitance ranges in common use, one USA one European. Link to comment Share on other sites More sharing options...
nicknorman Posted May 15, 2020 Report Share Posted May 15, 2020 1 hour ago, Detling said: They work by the level varying a resistance so whichever way round the wires are it will be the same. If you are lucky the gauge will have a little switch or setting to use a low resistance full/high empty type, or high resistance full/low empty type sender. If not you need a new sender of the correct type or a new gauge. There are also two resitance ranges in common use, one USA one European. Is that how this types (directly) works? It doesn’t seem to be a float with a wiper moving around a rheostat type thing. The float is not mechanically connected to anything, it’s position is sensed electronically somehow. Yes this sensed position is then converted into a variable resistance to drive the gauge, but there must be some electronics in the mix somewhere. Link to comment Share on other sites More sharing options...
system 4-50 Posted May 16, 2020 Report Share Posted May 16, 2020 (edited) The float is magnetic and flips a ? (forgotten the name) about every 20mm changing the total resistance. The increase/decrease is not identical per step, but tailored to the gauge. From my tanks notes: // Sensors are either: // European - empty = ~0 ohms full = ~190 ohms // USA - empty = ~230 ohms full = ~30 ohms // T1 has a WEMA hi resolution sensor - USA - step ~= 10mm // T2 has a WEMA standard sensor - EU - step ~= 20mm // T3 has a WEMA standard sensor - USA - step ~= 20mm? Edit: Ignore above step sizes as must be overall length dependant. Edited May 16, 2020 by system 4-50 Link to comment Share on other sites More sharing options...
BEngo Posted May 16, 2020 Report Share Posted May 16, 2020 The tube of the sender is usually full of resistors and reed switches to bypass more or less of them according to the position of the magnet in the float. N Link to comment Share on other sites More sharing options...
mrsmelly Posted May 16, 2020 Report Share Posted May 16, 2020 1 hour ago, system 4-50 said: The float is magnetic and flips a ? (forgotten the name) about every 20mm changing the total resistance. The increase/decrease is not identical per step, but tailored to the gauge. From my tanks notes: // Sensors are either: // European - empty = ~0 ohms full = ~190 ohms // USA - empty = ~230 ohms full = ~30 ohms // T1 has a WEMA hi resolution sensor - USA - step ~= 10mm // T2 has a WEMA standard sensor - EU - step ~= 20mm // T3 has a WEMA standard sensor - USA - step ~= 20mm? Edit: Ignore above step sizes as must be overall length dependant. blomin eck................now I know why I use a stick!! 1 Link to comment Share on other sites More sharing options...
Tony Brooks Posted May 16, 2020 Report Share Posted May 16, 2020 I suspect that if this is a three terminal bi-coil gauge the OP has transposed the neg. and gauge connection. Link to comment Share on other sites More sharing options...
WotEver Posted May 16, 2020 Report Share Posted May 16, 2020 12 hours ago, Tony Brooks said: I suspect that if this is a three terminal bi-coil gauge the OP has transposed the neg. and gauge connection. Or... 13 hours ago, system 4-50 said: // European - empty = ~0 ohms full = ~190 ohms // USA - empty = ~230 ohms full = ~30 ohms ... he's got the wrong gauge for the sender. Link to comment Share on other sites More sharing options...
Dr Bob Posted May 16, 2020 Report Share Posted May 16, 2020 12 hours ago, mrsmelly said: blomin eck................now I know why I use a stick!! I agree. A stick is cheaper and will work for 20 years plus. 1 Link to comment Share on other sites More sharing options...
mrsmelly Posted May 16, 2020 Report Share Posted May 16, 2020 7 minutes ago, Dr Bob said: I agree. A stick is cheaper and will work for 20 years plus. I owned a boat with stoopid tanks that u were unable to get a stuck in it was also a pig to fill and would blow back if not careful. It had a fuel gauge and its the only boat I have ever run out of fuel with ? Link to comment Share on other sites More sharing options...
system 4-50 Posted May 16, 2020 Report Share Posted May 16, 2020 Sticks covered in diesel? What do you do with it after? How careful are you not transfer COV19 into your diesel tank? 1 Link to comment Share on other sites More sharing options...
Dr Bob Posted May 16, 2020 Report Share Posted May 16, 2020 45 minutes ago, system 4-50 said: Sticks covered in diesel? What do you do with it after? How careful are you not transfer COV19 into your diesel tank? Nah, diesel bug kills the virus. 1 Link to comment Share on other sites More sharing options...
robbio c Posted May 18, 2020 Author Report Share Posted May 18, 2020 (edited) Thanks for all replies swapped wires around at guage and the same outcome guess I'll have to buy a different guage but I was sure the one I had was European type .thanks again will let us know the outcome when I fit new gauge Edited May 18, 2020 by robbio c Link to comment Share on other sites More sharing options...
matty40s Posted May 18, 2020 Report Share Posted May 18, 2020 On 16/05/2020 at 21:30, mrsmelly said: I owned a boat with stoopid tanks that u were unable to get a stuck in it was also a pig to fill and would blow back if not careful. It had a fuel gauge and its the only boat I have ever run out of fuel with ? Another reason Hudsons are so sought after.... Link to comment Share on other sites More sharing options...
mrsmelly Posted May 18, 2020 Report Share Posted May 18, 2020 4 minutes ago, matty40s said: Another reason Hudsons are so sought after.... In fairness it was a bloody well built boat wiv lots of steel and super woodwork..............BUT............too bloomin eavy for and old git and I much prefer our second colecraft offering. still not as nice as our Horsley Quenet though, that were fab!! Link to comment Share on other sites More sharing options...
Featured Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now