can i use a resistor to calibrate fuel sender

Can those that bought their cars new qualify this statement? The sender consists of a float on an arm that varies the resistance the sender applies to the circuit with gauge. EMPTY. Procedure. Correctly adjusted fuel gauge sender, empty tank resistance reading Once you've fiddled your brains out and get close as you can you can, then get some fixed resistors in the values given above (20 and 222 Ohms, or use a single variable 1K ohm potentiometer and use your multimeter to calibrate it before attachment). 0000001411 00000 n endstream endobj 56 0 obj <>/Metadata 15 0 R/Outlines 6 0 R/PageLayout/OneColumn/Pages 14 0 R/StructTreeRoot 17 0 R/Type/Catalog>> endobj 57 0 obj <>/ExtGState<>/Font<>/XObject<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 58 0 obj <> endobj 59 0 obj <> endobj 60 0 obj <> endobj 61 0 obj [/Indexed/DeviceRGB 255 80 0 R] endobj 62 0 obj <> endobj 63 0 obj <> endobj 64 0 obj <>stream 0000004943 00000 n It's an easy mistake to make. What is your resistance when the fuel sender is at the bottom (empty tank) and at top (full tank)? Clear editor. If that passes muster, time to check the gauge by connecting a known resistor close to the gauge to see if it reads full scale. 0000023050 00000 n H�\��n�0��@�I�@Y���?Ց)�C��>�v���l�qla6�~�b����s�~���t};^-�����ܯs��Әյ����9��æ��1��.�~8��?�ã��i��0̦0���) }k���%�|Y�����~�?�5���}�����aڱשiCl�s��"kS��c�����S. I've observed the same thing on other 2002s over the years, so that's at least a small sample reflecting that behavior. A 40 Ohm resistor will indicate about 1/2, and a 60 Ohm about 1/4, etc. However, 18 AWG wire is recommended if running the fuel sender wiring so the resistance of the wire will not affect the fuel ohms reading. They can be cleaned (VERY carefully) with carburetor cleaner and a Q tip. 0000061228 00000 n This will "polish" the wire and remove any debris that could cause the float to stick. These are a tube apparatus with a float in the middle. Shown between the two test leads is the additional resistor parallel to the sending unit. Doesn't quite give me full scale (0-5 volts) but its close enough. We have placed cookies on your device to help make this website better. It's linear, so at midpoint the reading should be 37.5 ohms, etc. If you have 24 volt system you must use the added resistors as shown in the diagram. " I got home up a hill no less, next day it took me 6 or 7 attempts to back out of the sloped driveway, 2 ft at a time - run great, stall, etc... Clearly fuel delivery. Cies Fuel Sender System . Temperature gauge does not read correctly with single wire temperature sender. Zero ohms correlates to "empty" and 90 ohms correlates to "full". 0000022255 00000 n �CE���B�h+q؇�� 41�Q��~6�:i�H~�v����X�n��=�� ��ـ�p��Ω8ۙ�~[v�7^E�\��}��A�9D��0�ӳ.�R�[�:w����^AT߼���( You can clean them gently with solvent / lubricant. Hi,   You cannot paste images directly. **(See Sending Unit Wiring Section) I = Supply 12v, key on power to this terminal. × I'm going in again. It's a thin wire that clips on the sending unit and has a portion that inserts in to a tiny hole in the side of the silver cylinder. (genius at work here), Site Problems, Suggestions, and Questions. 0000045231 00000 n without showing the diagram. Level sensor is actually an FD's which is 10-70 ohm I believe I'm using a 33 ohm resistor. It is recommended to use a 3 Amp automotive fuse when supplying power to this gauge. (pry gently between the metal edge and the light colored plastic surface) Once that's off, you'll see a (6mm?) No crud. SENDING UNIT The sending unit is installed in the fuel tank and consists of a float and arm that is attached to variable resistor. The sender consists of a float on an arm that varies the resistance the sender applies to the circuit with gauge. %%EOF That way, you will be able to vary the resistance in multiples of 10 ohms and see if the gauge behaves linearly or not. If you can get those and post them up here we can select a resistor value and create a calibration curve. To get the right gauge and/or sender, measure the resistance of your existing sender. I get 100 miles in the first 1/4 tank. If it's a brand new sending unit (or one installed previously by someone else, recently), someone may have neglected to remove the set pin / thin wire that holds the float stationary during shipping. I'm sure someone on here knows what the min and max resistance is supposed to be. FWIW - the increments on a 2002 fuel gauge are not linear. All other signal resistances will be lower. Fuel senders have a rheostat that provides a resistance to ground. Can you calibrate the fuel gauge ? 0000008491 00000 n × �%o���W�9�֖���$���\�-ق�,`f��`��`f��`7� ���B/���K�%�x �^B}��x������W�+;���������;�:�:�:�:�:�:�:�*�+�+�+�+u:J���])ޕRS����E�]]�]]���7U|SeGEGeGEGeGEGώ=sz�����3�GNϜ9=sz�����3�G�����.�s�b+��3_s��bL#���2��~_�;��I���� I think part of the problem is that flat tank, and the fact that the sender unit is inside an aluminum tube, which keeps the gauge from jumping all over the place as gas sloshes around in the tank. 95 0 obj <>stream Freedom Line gauges work directly with the vehicles ECU using the CAN (J1979) protocol (All vehicles 2008 and newer are required to be compatible with the CAN (J1979) protocol). 0000010735 00000 n �x ����BE�_�^��]/����Q���I��%���s�PڠMu8:T�. Testing can be done by removing the sending wire from the gas tank sending unit and plugging in the test unit. Ever notice how long that tube takes to drain when you remove it from the tank? Cavitating pump = loud pump. I'm not cancelling the order, just because California pissed me off... good to have a spare before they start scanning packages too. It seems like the traditional solution for the fuel sender in a 12 volt upgrade is to simply put a resistor in the line, but the theory kind 'scapes me. When the tank is full, the resistance to the fuel gauge is about 4 Ohms. I used a 1/16 inch diameter welding rod with marks on it so I could physically push the float up inside the sender to 1/4, 1/2, 3/4 and Full positions. I digress, I'm a genius (not). 3 – Connection To connect the fuel sender you can use the fuel pump connector, where the sensor terminations are, or the stock dash connector. (Right tail light assembly shares a common ground with the fuel sender). With this simple device, you can ensure your gauges are accurately reading your fuel level. 0000002539 00000 n Very small readings when the tank is full. Using five 15 ohm resistors in series, I connected them to the wires that norm, Gently use a jeweler's screwdriver and pop the metal edge off the plastic portion. Forget that the gauge indicated 2/3 full. I re-assembled and it still gives a lopsided reading. To convert a resistance sensor to a voltage, a pull up resistor is required, see figure 1 below If you have an account, sign in now to post with your account. I suspect it looks something like this, which is out of a 740. 55 41 For example a 69 Camaro has a 0-90 ohm fuel sender. What size wire do I need to use for the instrument cluster installation? It should be relatively easy to determine this non-linear behavior. Just using a 5 volt regulator with a resistor value of the half range point as the pull up resistor. 0000002932 00000 n h�b```a``�����p�,?�3�EY8ZV�10Lq`@��*�^:����B��`)��������@Z���"��L}lW��'0=c�g��x�u {�…8�y�NMq,g��,��~u��3�Z ���LؓW;�2 -`���@�+�Al��d�4;��@����A���p00 �@D ��+� 0000000016 00000 n A 40 Ohm resistor will indicate about 1/2, and a 60 Ohm about 1/4, etc. When empty, the resistance is about 80 Ohms. Turn on the ignition, and you should see the gas gauge read about 3/4 full. So a typical European standard would be 10 ohms at empty and 180 ohms at full for a fuel gauge/sender combination. I vaguely recall many years ago I accidentally reversed the electrical connections to the fuel sender (standard, no fuel pump) and the fuel gauge remained stuck in the 3/4 position. 0000009260 00000 n The low fuel light is energized when the sending unit provides a 10 ohm signal to the fuel gauge. <]/Prev 136604/XRefStm 1411>> The gage is measuring the voltage drop across the sender or the voltage drop across an internal resistor. What normally happens is that even if you fill up the tank to the full the gauge will not point all the way to the full level and by the time the tank is 1/2 full or even 3/4 full the gauge shows empty which can be a bit of pain. 0000003870 00000 n The only easy way to accomplish this is to reduce the voltage to the fuel gauge with a small voltage reducer (resistor!). On the top of your sender, you'll find a couple of wires. 0000021802 00000 n 0000003623 00000 n Selecting the resistor value can sometimes be a little involved, as if the fuel level sender has relatively low resistance values, we need to take the overall current flow (and thus power dissipation) into account. �C�K Cp�M� �4N �,d���'�P��O̢_3U��v�$��0�L�� 0�`@^��9���vfz����/"���}��A��>�8Na������[�:w���겖������&˲�ZL���צ-a�ڢ��� ��y|�d��c�o���@1�Rg\� g��S�a��|7A)9�1n�G�#�����OF>Yœ��)qΜkf��=,��(r���_qEyTƜsEyԎyG�g�W�1kV�Y�fE�ՙ�Ph֯I�f �4h�Wӽz˼%f �4h~���h֠I�^!�q�-E~T�ʍS!��4�����,���u���/1�>�+� � �y Hardware Required (1) float sender per fuel tank (1) 470 ohm (¼-½ watt) resistor per sender; available from GRT, Radio Shack or other electronics supply source *NOTE: EIS Model 2000 units have two user-definable Aux inputs. I wouldn't lie to you. GM fuel sending units are designed to indicate the fuel level using a resistive signal. 0000007190 00000 n Any of these can be used for fuel senders. H�|S�O�0~�_q��C��+�6@B��H{�x�J�Nm�ڰ��~�8 �)>�w��}�9?ٶ˻j���Q~Ҷ�⡾�y^6�p�O��_�����Vi] _X�uu[o!/�ݗ�~���e������)d���a���넳����!���L��.K�!H�@��h��X��,R.��,�\K8k���}��m�e����]&Ep0�X�e-����:c��_�yI�S�Jq�E��K�s6��نO�q�>�l��7�U��)(��}I|~M,���dڴm�>5���`��[(4U���\>5M����P�����31�ȅ�"Q�b�R�ׅK!��rAq�����D�D ��������/�e�zْ+C�sɘF� ���D�Au��ؓ��N�0v�5{�U٦I�mY_-7�:nWl�y:zk���m���-��W²zEyVW�x�@�TX *�"1�d�I„4��E K3;Cר �Q�����ʟ�R�Ul�3�M�S��(�β����i��8ۇ����w�T��%bd|1�'n�U�Rq���+ As Mike said, take a known resistor (say 25 Ohms) and connect it between the Brown/Yellow wire to the sender and ground. 0000003462 00000 n Today I decided to take a closer look and pulled the inline Mann fuel filter, which immediately shot fuel 6ft in the air (pressurized). EIS Model 4000/6000/9000 units have 6 user-definable Aux inputs. I also have retained the stock fuel tank and sender in my 240Z, but wanted to use a matching Autometer Pro-Comp Fuel level gage. Wiring suggestions ? Don't know if this is your problem, but I thought I'd share the thought. 03-04 Fuel gauges may use a high-tech air core movement (top) or an old style thermal strip (bottom) to move the needle—in either case the changing resistance of the sender … I kinda thought that the fuel guage was a current operated device. Yes/No? They say "Connect to 12 Volt directly. deschodt, October 23, 2017 in BMW 2002 and other '02. S = This connects to the sending unit in the fuel tank. The standards are normally expressed in terms of their ohmic values at the low and high end of the scale shown on the gauge. 0000076833 00000 n The resistor shown here has an actual value of 135 Ohms and as can be seen, this causes the sending unit … This provides the gauge and sender with a voltage that won't burn them up and one that makes the gauge read properly at any fuel level. Make sure the brown ground wire on the sender is clean and making a good ground (in addition to checking the ground on the instrument pod). When new, the range of the resistive signal is between 0-90 ohms. Each Fuel Level Sending Unit is designed with a specific resistive input range. When I tested the sender I get about 12 ohms when the float would be at its highest in the tank and 311 at the lowest. Out of Calibration Reason 1 The resistance range of the sender unit is wider than what gauge can indicate.   Your previous content has been restored. It is ready about twice the fuel it should, so I put together a voltage divider using a dual cement 5 watt resistor. I added a second ground wire to the sender, and this cured the gas gauge from bouncing whenever I used the right turn signal. ‪Fuel gauge calibration‬‏ - YouTube ... but I can tell you that using a variable resistor or potentiometer is the method for testing gauges and gauge circuits in Ford dealerships for most cars made basically forever up until recently when gauge circuits are becoming digitized. 0000060903 00000 n 0000004297 00000 n Yep. If you choose to disassemble it (remove the cylinder) be careful and treat it like micro-surgery. I disassembled mine and it was relatively clean. Also connect one of the resistors to ground on the case, and you can leave it connected that way for the duration of this calibration exercise. new sender ? The sender in the fuel tank is a variable resistor with a float. 0000001725 00000 n Conveniently (or not) the sender works the wrong way around compared to all aftermarket gauges and senders. 0000001116 00000 n Some tests can be done to get an idea of the accuracy of the gauge. Can I put my gauge cluster into DEMO mode, for display at an event, or testing purposes? My  2002 is not a good car, it is a *great* car. endstream endobj 69 0 obj <>stream You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Consulting my good ole BMWnospaceCCA Tech Tips book from 1975, the writeup on the 2002 fuel sender shows that with the float at the top of its travel (full tank) an ohmeter placed across the two contacts should read essentially zero ohms, and with the float at the bottom of its travel (empty tank) the ohmeter should read 75 ohms. The 3/4 mark is near the full mark and the 1/4 mark is near the empty mark... so the first 1/4 seems like it lasts forever and the second half of the tank seems like it disappears quickly. I bent the arm down until it just hovered above the bottom of the tank (like by 1/2 a mm). Trying the pump: I had my kid turn the ignition and observed a dribble of inconsistent fuel out of the pump... Hmm, possibly the pump then.

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