Crank no start fuel pump not priming?

Tiny
JSNYDE
  • MEMBER
  • 2003 JEEP LIBERTY
  • 3.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
No engine light upon first crank fuel pump not priming or getting power replaced fuse relay and fuel pump still no power to pump charged battery cleaned ground
Wednesday, February 11th, 2026 AT 7:18 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,302 POSTS
So if the MAP sensor does not give a signal the engine is cranking over by not showing a reading the engine will not start, I would unplug the sensor and the PCM will substitute a default value to help the engine start, here is the location of the sensor. Check out the images (below). Please let us know what happens. Ken
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Wednesday, February 11th, 2026 AT 9:53 AM
Tiny
JSNYDE
  • MEMBER
  • 2 POSTS
Crankshaft positioning sensor? Also when I crank over my tach doesn’t jump anymore
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Friday, February 13th, 2026 AT 12:50 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,302 POSTS
O ya, if the tach is not working when cranking the I would replace the crankshaft angle sensor. Please go over this video as well

https://www.youtube.com/watch?v=lXLJbuAZ4CE

Check out the images (below). Please let us know what happens.
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Saturday, February 14th, 2026 AT 8:33 AM

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