MarkAubuchon Posted June 25, 2012 Report Posted June 25, 2012 ON MY 49 COUPE I AM RUNNIG SIX VOLT, HAD THE TANK CLEANED AND REPLACED THE FUEL SENDING UNIT IN THE TANK. 1. ONCE i BURN OFF 5 PLUS GALLONS THE GAUGE IS VERY ERATIC, GOING FROM FULL TO EMPTY, NEEDLE JUST BOUNCES AROUND 2. AFTER 10 GALLONS IS READS EMPTY. WHAT ADJUSTMENTS CAN i MAKE? Quote
Plymouthy Adams Posted June 25, 2012 Report Posted June 25, 2012 as it is easy to pull the sender from the tank I would remove it and check for smooth operation of the float arm and contact wiper to the resistor itself..if this was a generic replacement..did you mock up the swing arm to correctly represent the full/empty locations.. Quote
claybill Posted June 25, 2012 Report Posted June 25, 2012 i remember reading that getting the wires crossed at the tank or gage would give erratic symptoms. Quote
1941coupe Posted June 26, 2012 Report Posted June 26, 2012 (edited) You need to calibrate your gauge first. There should be instructions in the manual on how to do it. Mine would also be erratic sometimes, and would only show from full to 1/4. After calibration, the erratic-ness went away and it now reads properly. I'm not sure if the gauges on the later cars are re-calibrateable, but my guess is they are ( I have a 41 Plymouth ). When I first got the car I ran it out of gas because of it. Getting the wires crossed would show a reverse reading on the gauge, provided your wires and grounds are in good shape. Best way to calibrate it is with a new ( and correct) sending unit, yours is new so you would have to pull it out and let any gas on the unit evaporate first and then set up your test wires per the directions on the manual. I made a test stand out of a cardboard box to mount the new unit and did the calibration while sitting in the car with the windows mostly closed. After I calibrated it, it now shows correct indications even with the original sending unit still in the car. I would definitely not try to do a generic unit installation but would buy the correct replacement part. I hope this helps. Carlos Edited June 26, 2012 by 1941coupe Quote
FESTER60 Posted June 28, 2012 Report Posted June 28, 2012 You need to calibrate your gauge first. I would definitely not try to do a generic unit installation but would buy the correct replacement part. I hope this helps. Carlos O.K. Two questions. Where can I get one, and will it work with my soon to be 12V neg. ground system? Quote
1941coupe Posted June 28, 2012 Report Posted June 28, 2012 (edited) My car is the original 6 v. system. I got the new sending unit from Andy Bernbaum. There is also Roberts motor parts. You should give either of them a call, they might be able to sell you a correct part in 12 volt or at least point you in the right direction. My advice since it appears you have not pulled any wires yet is to re-wire it but keep it with the original 6 volt system. There is an excellent write up about the 6 vrs.12 v. decision right on this site under technical "tips" I believe. You might find a link on this page but I know it can be found on the homepage..it is a must read. My good friend just installed a new wiring harness on his 40' Dodge and is very happy with his 6 v. original car. It would also be better for the re-sale value to keep it as original as possible. Carlos Edited June 28, 2012 by 1941coupe Quote
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