O.T. 99 Ram problem - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-02-2003, 11:25 AM
onetuffcj
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O.T. 99 Ram problem

This is off topic but i think with the talent around here i can resolve this problem.I bought a 99 Ram a month ago , a week ago the gas guage started to go from full then to empty at different times,then it would go to the correct level.The dealer looked at it and condemed the fuel sending unit, they changed the sending unit.Wife brought the truck home(30 miles) and used a 1/2 tank of fuel,upon looking at it i found a major leak, the dealer towed it and had to replace the fuel regulator as they cracked the fitting off the top, leaving high pressure fuel spraying all over the place.Thank god it did not burn..now a day later the sending unit is doing the same thing again, it's either full or empty. I requested the old unit, so they did install a new one, Any one ever have a problem like this or have any advise would be great.
Thanks, Mike
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post #2 of (permalink) Old 03-02-2003, 12:07 PM
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Re: O.T. 99 Ram problem

1. There are four parts to this problem,
a. The gauge,
b. The sender assembly,
c. The wiring,
d. The gorund,
2. You've repalced "b",
3. and likely it's not bad,
4. The shop know's it's not bad,
5. I suspect that the problem is
6. An electrical problem in the dash,
7. That guague's connection to the wiring harness
8. Is making and breaking.
9. The sender ground at the tank could be compromised,
10. And it should be confirmed as "good"...
11. Also the wirning and connectors should be confirmed.
12. I'd bet it's not the sender again.
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post #3 of (permalink) Old 03-02-2003, 12:35 PM
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Re: O.T. 99 Ram problem

Try pushing in the "trip reset" button on the dash, and while holding the button in, turn the key on. Wait a few seconds and watch the dash. It should go into a calibration mode. The fuel guage should go from E to 1/4 to 1/2 to F. If these calibration points are in spec, chances are the sending unit or associated ground is the problem.
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post #4 of (permalink) Old 03-02-2003, 01:27 PM
onetuffcj
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Re: O.T. 99 Ram problem

OK i did the cal. test and everything went fine, neat test, i would suspect a problem if the guage only went half way or did not work. I think it's a ground problem, is it grounded at the tank or does it feed back to the engine compartment???Where could i get a electrical schematic for this truck???
post #5 of (permalink) Old 03-02-2003, 03:28 PM
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Re: O.T. 99 Ram problem

I'll see if I can get a scematic at work tomorrow. At least the flow chart for one guage not working. This is the only guage not working properly, correct? It makes a difference on the flow charts.
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post #6 of (permalink) Old 03-02-2003, 06:06 PM
onetuffcj
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Re: O.T. 99 Ram problem

I just got home, on the way home the guage went from a true 1/2 tank to a full tank, i pulled over and did the test, here is what happened.
Everything worked in stages,all the guages except the fuel,seem to be 4 stages, on the last stage the fuel guage went from empty right to full. I did the test 4 times and all the same, are these guages controlled from an output on a board???This seems to be where the problem is, the guage is now on E. Where should i go with this now??
post #7 of (permalink) Old 03-03-2003, 04:13 PM
onetuffcj
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Re: O.T. 99 Ram problem

Any luck with that flow chart??
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