No start, fuel delivery issue

Tiny
JAREDR
  • MEMBER
  • 1993 JEEP GRAND CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
93 gc w/4.0 a/t 4wd.
died out while siting at idle after replacing f/p 2 mo. Prior.
ordered new pump and installed, no start. Replaced pump due to running for a breif few seconds and then not at all.
got another pump!@#W$$^#%, plugged into connector and ran for a few seconds, same result. Tested for power at f/p connector, none present except for level sender. Ohmed crank sensor, excessive, replaced, still no power, rechecked new sensor, no resistance. 8 volts to sensor. Swapped relays around. Nada. Jumpered fuel pump at relay, wal la! Power at fuel pump builds 42psi, No Start. Still unable to get power w/o jumper, Cycled door switch to deactivate security even though no security light flashing. No CEL comes on cluster?

Thanks jared
Thursday, July 7th, 2011 AT 7:36 PM

5 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check fuel pump relay wiring and relay box wiring.
Check red wire for battery volts.
Dark green wire for ignition switch power.
Also, check ballast resister on side inner fender with dark green -tan wires.
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Sunday, August 30th, 2020 AT 11:18 AM
Tiny
JAREDR
  • MEMBER
  • 4 POSTS
Checked power under PDC with relay installed, no power from orange/black wire to fuel pump. Checked spark after that, none.
Going to check ignition power next, thanks.
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Sunday, August 30th, 2020 AT 11:18 AM
Tiny
JAREDR
  • MEMBER
  • 4 POSTS
Do not see a ballast resistor anywhere. Not to sure they would use that on this model.
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Sunday, August 30th, 2020 AT 11:18 AM
Tiny
JAREDR
  • MEMBER
  • 4 POSTS
Power present in light blue/red ignition wire key on not when off.
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Sunday, August 30th, 2020 AT 11:18 AM
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Wiring harness below.
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Sunday, August 30th, 2020 AT 11:18 AM

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