I just replaced fuel pump and fuel pump relay on.

Tiny
ANONYMOUS
  • 1998 JEEP GRAND CHEROKEE
  • 200,000 MILES

I just replaced fuel pump and fuel pump relay on a 1998 Jeep Grand Cherokee. It turns but it will not start. Another thing, there is no humming noise from the fuel pump when the key is turned on. What can be the problem?

Monday, February 11th, 2013 AT 2:48 AM

1 Reply

Tiny
CARADIODOC
  • EXPERT
  • 26,795 POSTS

The pump must not run with the ignition switch turned on. That would present a serious fire hazard if a fuel line got ruptured in a crash. The pump should run for one second after turning on the ignition switch, then again during engine cranking.

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Monday, February 11th, 2013 AT 8:48 AM

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