Fuel Gauge Gremlin

[ashley_j]

My second post and another gauge issue. My '73 Challenger with rallye cluster that was redone by AutoInstruments  has a RTE Solid State Limiter  seems to have a fuel gauge issue. When I first juiced the cluster the fuel gauge seemed to read low but I was working on other things and put it down lower on my to do list. The gauge then seemed to start working and read correctly after the first fillup. Then I noticed a guage blip that made the gauge read about 1/4 lower than I thought it should. It sat for about 30 secs and return to the higher reading. This occurs regularly but not on any pattern that I can see. I have a new sending unit and ground strap. Any ideas on where to check or any checks I may have missed?  Thanks

[MEK-Dangerfield]

Your voltage limiter is also linked to the oil pressure and temp. gauges. So if the limiter was at fault, all three would be going crazy at the same time.

I suspect it's your sending unit. I know many people have had problems with the aftermarket units not reading correctly, but this is the first I have heard about one jumping around.

  Mike

[ashley_j]

The other gauges are working correctly or at least consistently with no erractic behavior. I didn't think it was in the limiter but I needed a second opinion. Is their a good, in car test for the sending unit?

[340_6pak]

The only test I know is with a volt-ohm meter. I do not know what the reading should be, but others on this board do.

[71 DEPUTY]

This is probley due to the fact that the new limiter gives you a steady 5 volts- so any float level change in the tank will reflect it faster than the old limiter as it was a pulsed voltage.  if the the other gauges are reading normal when it does this then the limiter is ok- the float is just bouncing around and maybe not setup right in the tank!

[73Chally]

Is it an aftermarket sending unit?  If so, you might need to pull it out and bend it a bit so the bottom doesn't hit on the bottom of the tank.  I had to do that with mine.  You probably need to pull it anyways, because it sounds like something is rubbing or catching on the float.

[ashley_j]

Thanks for all the advice!!!!I have been away and have not been back to the board until today. I will look into some of the ideas as soon as I burn a little fuel.
        

[Bullitt-]

You state you have a new ground strap but what you describe is classic symptom of poor ground.
Double check that, maybe add a second ground & see what happens.