94 Chrysler LHS

Tiny
LITTLETECH
  • MEMBER
  • 1994 CHRYSLER LHS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
I have a 94 chrysler lhs that keeps coming back first it had no fuel pressure so we replaced pump started but ran rough needed tune up so we completed that then car comes back again same problem we replaced fuel pump under warrenty week later or so and the relay at this point started ran great few days later back to point a again I grabbed wiring harnest and wiggled it thinking maybe a short but it didnt make difference it started this morning but I already know its going to do it again
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Tuesday, August 2nd, 2011 AT 1:55 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
When the engine quits did you check for spark or just stop troubleshooting when you found the fuel pump not running?
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Tuesday, August 2nd, 2011 AT 5:49 PM
Tiny
LITTLETECH
  • MEMBER
Spark was first thing I checked it was still present after the car died
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Wednesday, August 3rd, 2011 AT 1:31 PM
Tiny
CARADIODOC
  • EXPERT
The next time it fails check for voltage to the pump. If it's there for one second after turning the ignition switch to "run", the pump should run for that one second. If there's no voltage, we have a wiring problem. If there is voltage for that first one second, watch if that voltage comes back during cranking. If it does not come back suspect the crankshaft position sensor or the camshaft position sensor.

If you have voltage but the pump doesn't run, have the fuel tank steam cleaned at a radiator repair shop before replacing the pump again. Chrysler pumps are real quiet because they are built with very tight clearances but that makes them susceptible to the impellers locking up due to microscopic debris in the tank. That is a real common cause of repeat pump failures. By about the fifth or sixth pump the debris will be gone and the next pump will work fine. That's often the one that people get frustrated enough to buy one from the dealer so they think the aftermarket pumps are junk. In fact, NAPA pumps, (and perhaps some others), come from the same supplier that Chrysler gets them from so they are just as quiet as the dealer's pumps.

Sorry it took so long to get back to you. Internet provider was down again yesterday for the entire day.
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Wednesday, August 3rd, 2011 AT 8:52 PM
Tiny
LITTLETECH
  • MEMBER
Ok ill see what I come up with thanks alot for your time
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Wednesday, August 3rd, 2011 AT 9:05 PM

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