If it shows FULL right after filling up and then quickly falls off to empty after a few miles then the sending unit is loose. Once you remove it as Graham described and look under the metal cover you will see a coil of copper wires what looks like a tiny copper fork that rakes across the wires when the float arm goes up and down. On mine this contraption had gotten sloppy over the years and it only made contact when the arm was all the way up (when the tank was full). I just cleaned it up all up, bent the fork a bit so it always makes contact with the coils, and put it back together. You can watch it sweep up and down with an Ohm meter but it's a bit delayed so move the arm and wait a few seconds to see the change on your meter.
-Kyle On Wed, Sep 12, 2018 at 7:51 AM Doug Jones <d.alan.jo...@gmail.com> wrote: > Bob > > According to the schematic the tank has a sending unit, I assume it has > just a variable resister in it that increase or decreases as the amount of > fuel is being used. That resistance is transmitted through to wires that go > through the harness. If you take a DVM ( Digital Volt Ohm Meter) and set it > to read Ohm's Or resistance and move the sensor arm up and down after you > remove it. You should see a change in the resistance. That means its > working. If you are having issues with that and it appears to be all rusted > or crudded up. Replace the sending unit in the tank and remember to order a > new O ring seal to put it back in with. ALWAYS REMEMBER THAT NOT ONLY GAS > is explosive but the FUMES are also. So be careful and do this away from > Flames, in an open space. > > On Tuesday, September 11, 2018 at 6:27:03 PM UTC-4, Bob Aulert wrote: >> >> What about a situation where the indicator shows FULL when the tank is >> indeed full, but is flashing RES after about 50 miles? >> > -- > You received this message because you are subscribed to the Google Groups > "Nighthawk Motorcycle Lovers!" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to nighthawk_lovers+unsubscr...@googlegroups.com. > To post to this group, send email to nighthawk_lovers@googlegroups.com. > Visit this group at https://groups.google.com/group/nighthawk_lovers. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To unsubscribe from this group and stop receiving emails from it, send an email to nighthawk_lovers+unsubscr...@googlegroups.com. To post to this group, send email to nighthawk_lovers@googlegroups.com. Visit this group at https://groups.google.com/group/nighthawk_lovers. For more options, visit https://groups.google.com/d/optout.
