partsmj Posted May 26, 2014 Share Posted May 26, 2014 I have a 90 Cherokee and 90 Comanche. They have been idle for a while. I put a battery in the Cherokee and it fired right up. I put a battery in the Comanche and it did not fire right up. I do not hear the fuel pump come on. I refreshed the ground by the oil dipstick. I put in all the relays from the Cherokee. I have voltage at the pump. Time for a pump? Thanks for your help. Ken. Link to comment Share on other sites More sharing options...
Dillithium Posted May 26, 2014 Share Posted May 26, 2014 The ground for the fuel pump for the comanche is behind the driver's side tail light, try that cleaning that up. Link to comment Share on other sites More sharing options...
partsmj Posted May 26, 2014 Author Share Posted May 26, 2014 Thanks. Done, no change, no pump. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 26, 2014 Share Posted May 26, 2014 I have a 90 Cherokee and 90 Comanche. They have been idle for a while. I put a battery in the Cherokee and it fired right up. I put a battery in the Comanche and it did not fire right up. I do not hear the fuel pump come on. I refreshed the ground by the oil dipstick. I put in all the relays from the Cherokee. I have voltage at the pump. Time for a pump? Thanks for your help. Ken. You have voltage at the pump and the pump doesn't run probably because you checked voltage using a chassis ground point instead of the ground wire under the left tail lamp. Agree - test for ground under the tail lamp and at the pump connector. Link to comment Share on other sites More sharing options...
desertrat Posted June 6, 2014 Share Posted June 6, 2014 I am having the same issue. Although it could possibly be the ground under the letf tail light, I have a strong feeling the problem is in the dash. I believe this because the parking brake seems to play a role in the fuel pump functioning. All of the fuses are functioning. Is there a relay under the dash that of which I am unaware? Link to comment Share on other sites More sharing options...
cruiser54 Posted June 6, 2014 Share Posted June 6, 2014 I am having the same issue. Although it could possibly be the ground under the letf tail light, I have a strong feeling the problem is in the dash. I believe this because the parking brake seems to play a role in the fuel pump functioning. All of the fuses are functioning. Is there a relay under the dash that of which I am unaware? Very doubtful. Sounds like a bad ground. Do the taillight ground FIRST. Link to comment Share on other sites More sharing options...
big66440 Posted June 6, 2014 Share Posted June 6, 2014 Try kicking the crap out of the gas tank right below the fuel pump to while somebody cranks it sometimes it will "wake it up" and run for a bit if not try jumping the ballast for the fuel pump on the driver side inner fender right by the air box or you can also spray starting fluid and see if it starts or at least sputters or you can do a fuel pressure test with a fuel gauge hooking it up to the schrader valve on the fuel rail these steps should help a bit :thumbsup: Link to comment Share on other sites More sharing options...
partsmj Posted July 21, 2014 Author Share Posted July 21, 2014 It was the fuel pump. I got a replacement bosch from rock auto with the filter sock. $80 to my door. I destroyed the lock ring. It was rusted pretty good. It came with the o ring which was good because the one with the fuel pump was no good. The pump was like a puzzle with adapters, but it is in there and the Comanche is outside running for the first time in years. I am now motivated to keep going and put it back on the road for my new daily driver. Thanks to all with your tips. Ken. Link to comment Share on other sites More sharing options...
badazzelanore Posted October 23, 2014 Share Posted October 23, 2014 Glad you got it running again. I am in the same boat you were. Can you shed some insight about your jigsaw puzzle with adapters? I am hopefully going to advance tomorrow to pick up some new fuel line, filter Bosch pump and a few other things if I can get my butt out of bed. Link to comment Share on other sites More sharing options...
big66440 Posted October 23, 2014 Share Posted October 23, 2014 It was the fuel pump. I got a replacement bosch from rock auto with the filter sock. $80 to my door. I destroyed the lock ring. It was rusted pretty good. It came with the o ring which was good because the one with the fuel pump was no good. The pump was like a puzzle with adapters, but it is in there and the Comanche is outside running for the first time in years. I am now motivated to keep going and put it back on the road for my new daily driver. Thanks to all with your tips. Ken. If it was the Bosch 69302 it will have a spacer and some other pieces to allow the fuel pump to fit snug, I had to trim mine just a little to make it work which was not a big deal at all since it is plastic, glad you got your comanche running :thumbsup: . Link to comment Share on other sites More sharing options...
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