desertmike Posted January 17, 2015 Share Posted January 17, 2015 Although I don't post all my petty problems I do lurk a lot. Getting ready for our 10 day stay at the KOH in Johnson Valley the 89 XJ was hard to start and keep running. Stalling out, backfireing, would only run above 2500, no power. After doing some of cruisers tips, cap, rotor, wires, grounds, plugs, checking vacuum etc, still no go. Checked some of the sensors on the MJ to test. Finally bought a fuel pressure tester from Auto Zone today. Put on the XJ and had 6 lbs of pressure, put on the MJ and had 40 lbs pressure, back on the XJ still 6 lbs. What is one of the better fuel pumps to replace with? Thanks in advance Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted January 17, 2015 Share Posted January 17, 2015 Bosch Link to comment Share on other sites More sharing options...
Knucklehead97 Posted January 17, 2015 Share Posted January 17, 2015 Just bought one off Ebay for 66$ shipped. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted January 17, 2015 Share Posted January 17, 2015 Whoops, mines for a MJ, not XJ. Got.confused. Sorry. Link to comment Share on other sites More sharing options...
desertmike Posted January 17, 2015 Author Share Posted January 17, 2015 After looking at fuel pumps, are the Renix ones different / alot different from the later ones? Link to comment Share on other sites More sharing options...
desertmike Posted January 20, 2015 Author Share Posted January 20, 2015 Update: Put in a new complete pump assy and wala, it starts and run great. No more stalling, backfiring, ruff running, etc. No bad sensors just a bad pump. Didn't get a Bosch unit because of price. I had to tweek the gauge lever a little to get it in and it went from 1/2 to almost empty. Gotta work on that. On the old unit the rubber hose had rotted away. I now believe in fuel pressure. And maybe all these wierd @$$ problems are from low pressure. Link to comment Share on other sites More sharing options...
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