(Right tail light assembly shares a common ground with the fuel sender). 3 – Connection To connect the fuel sender you can use the fuel pump connector, where the sensor terminations are, or the stock dash connector. xref   Your previous content has been restored. 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. 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. 0000001411 00000 n 55 41 That way, you will be able to vary the resistance in multiples of 10 ohms and see if the gauge behaves linearly or not. I tested this outside the tank. If all other electrical is ok, I would suspect that it may be hung up. 0000076833 00000 n Display as a link instead, × Conveniently (or not) the sender works the wrong way around compared to all aftermarket gauges and senders. Level sensor is actually an FD's which is 10-70 ohm I believe I'm using a 33 ohm resistor. 0000003870 00000 n These are a tube apparatus with a float in the middle. I bent the arm down until it just hovered above the bottom of the tank (like by 1/2 a mm). 0000061228 00000 n × The only easy way to accomplish this is to reduce the voltage to the fuel gauge with a small voltage reducer (resistor!). I suspect it looks something like this, which is out of a 740. Some tests can be done to get an idea of the accuracy of the gauge. With this simple device, you can ensure your gauges are accurately reading your fuel level. What size wire do I need to use for the instrument cluster installation? Look at the white lines on the gauge below full and above empty. The MSD pump was LOUD so I immediately ordered a new one plus a new fuel filter. What is your resistance when the fuel sender is at the bottom (empty tank) and at top (full tank)? I have put sealant to prevent the gas leak I had, it's a pain to remove all that. endstream endobj 67 0 obj <> endobj 68 0 obj <>stream   Your link has been automatically embedded. I really don't know, certainly some BS law that should not apply to a generic part used in  a 1973 car which is pre-smog and that I am free to modify. 0 �8�Y h�bb�e`b``l � + � The gage is measuring the voltage drop across the sender or the voltage drop across an internal resistor. Procedure. 0 As the fuel arm moves from the empty to the full position a contact is moved across the board on the rheostat which varies the resistance seen by the fuel gauge. Paul, that's been my experience. I took a few (terrible quality) pictures of the fuel gauge in my '74 as a function of sender resistance. Can you calibrate the fuel gauge ? 0000005203 00000 n It's an easy mistake to make. GM cars from the … The gauge is made with a bimetallic strip connected to the needle. H�\��n�0��y My  2002 is not a good car, it is a *great* car. 0000049824 00000 n Thanks for the synopsis guys. �%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���� 0000004297 00000 n Electrically all sensors can either be resistive (eg a temperature sensor) or voltage (a suspension potentiometer). 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). 95 0 obj <>stream 0000056701 00000 n Cavitating pump = loud pump. You can clean them gently with solvent / lubricant. Perhaps it's sticking part way and not dropping as the fuel level falls away beneath it. The resistor shown here has an actual value of 135 Ohms and as can be seen, this causes the sending unit to appear to have an EMPTY value of near 90 Ohms. The vehicle in question is the 2008+ ford transit. 0000009130 00000 n to the fuel sending unit to alter its resistance range to match the aftermarket gauge. I've observed the same thing on other 2002s over the years, so that's at least a small sample reflecting that behavior. 0000008491 00000 n I wouldn't lie to you. If I put a resistor in the circuit then the current is increased and the guage reading goes out in the weeds. Any of these can be used for fuel senders. The gauges on both my '69 and '73 take forever (200+ miles on the highway) to get down to perhaps 3/8 of a tank (between half and quarter) then drop precipitously down to the red mark--often in 30-40 miles. I did not clean the wires. 0000003510 00000 n All the parts are new(ish) but from different vendors. Testing can be done by removing the sending wire from the gas tank sending unit and plugging in the test unit. 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. 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. 0000010103 00000 n 0000006532 00000 n 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). I should pojnt out grounds aren't the issue, I regrounded my cluster recently and the needles do not move around, temps or gas... Can you calibrate or just buy a new sender ? All other signal resistances will be lower. So a typical European standard would be 10 ohms at empty and 180 ohms at full for a fuel gauge/sender combination. 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. On the top of your sender, you'll find a couple of wires. 0000022255 00000 n A 40 Ohm resistor will indicate about 1/2, and a 60 Ohm about 1/4, etc. 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). All the parts are new(ish) but from different vendors. That way I know for sure. (genius at work here), Site Problems, Suggestions, and Questions. 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 I build a cheap testing device using a 0 to 100 ohm potentiometer, then built a small box to house it and marked the exact calibrations for 0, 33 and 78 ohms on the box. When the tank is full, the resistance to the fuel gauge is about 4 Ohms. 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 … The Calibration Resistor on your 6.5L Diesel sets the maximum fuel delivery volume of the injection pump. I'm going in again. The circuit consists of a sender in the fuel tank and a gauge. Shown between the two test leads is the additional resistor parallel to the sending unit. 0000007190 00000 n It should be relatively easy to determine this non-linear behavior. When new, the range of the resistive signal is between 0-90 ohms. I'm having a hard time believing they'd let that pass. nut. Defective gauge ? to the fuel sending unit to alter its resistance range to match the aftermarket gauge. H�\��j�0��z Shown between the two test leads is the additional resistor parallel to the sending unit. available to change the gage readings. 0000004943 00000 n Wiring suggestions ? States can be anywhere between 0-10%, ignoring E85. using a 2 pin sensor although resistors are only connected to one wire obviously the gauge is way off as the sensor that it came with is only a probe, not an actual bolt in water sensor so matching up a sensor to work with no changes to the circuit wont do it.