1987 XJ 4.0L Fuel system electrical trouble

anyoceans

NAXJA Forum User
Location
Aloha, OR
Rig refused to start. During the trouble shotting process I turned off the A/C Blower to reduce noise so I could hear if the fuel pump was cycling on for the start. With the blower off the XJ fired and drove fine until I turned on fan, then it stalled. with the fan off it ran fine then died completely a week later. Fuel pump runs if voltage is supplied direct. Relays seem to be good, I switched them with new and I can hear and feel them cycle for the start. no voltage getting to pos wire at fuel pump.

I understand there is no balast resistor in the 87 but that wouldnt apply to a failed start according to some of the replys on other threads.

rig will start and run if I send voltage direct to the pump.

new to some of the tec terms abbrevations, pls use long version in reply, thanks
 
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