Mechanics

NO START, FUEL DELIVERY ISSUE

1993 Jeep Grand Cherokee • 6 cylinder 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
Avatar
Jaredr
July 7, 2011.



Check Fuel pump relay wiring and relay box wiring
check red wire for battery volts
dr grn wire for ignition switch power
Also check ballast resister on side inner fender with dark grn -tan wires


BMRFIXIT
Jul 8, 2011.
Checkd power under pdc with relay installed, no power from orange/black wire to f/p. Checked spark after that, none.
Going to check ignition power next, thanks.


Tiny
Jaredr
Jul 8, 2011.
Dont see a ballast resistor anywhere, not to sure they would use that on this model.


Tiny
Jaredr
Jul 8, 2011.
Power present in ltblue/ red ignition wire key on not when off


Tiny
Jaredr
Jul 8, 2011.
Wiring harness


BMRFIXIT
Jul 16, 2011.