P1494 on Jeep Grand Cherokee

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Just as I was telling someone I had a OBD II code reader my CEL came on. A P1494 is a leak detection pump.

I assume this is not related to the fuel pump I had replaced a few weeks ago? Is the leak detection pump something that could have been jiggled loose by dropping the tank to replace the fuel pump?

Looks like it could be a vacuum line leak or the switch that handles the leak detection.
 
Not sure where the pump is on a Jeep. When I had a problem with it on my 2000 Jetta it was behind the right rear wheel behind the fender liner near the fuel filler. Maybe look on Rockauto to see what it looks like to get a better idea, or Jeep website.
 
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