1989 comanche mj Posted March 2, 2017 Share Posted March 2, 2017 89 4 liter 5 speed. Has 20 to 22 psi running with the regulator hose on and off. Pressure drops immediately to 0 when shut off. I pinched off the rear fuel line while running and it dies. Checked with 2 different gauges. Is the rear rubber line the return or supply? I assumed it was the return since it was rubber and the front line into the regulator is steel. I read pressure should be 30 and 39 with vaccuum line off, so something is wrong. What pump should I get? I don't see them for sale. Link to comment Share on other sites More sharing options...
Ωhm Posted March 3, 2017 Share Posted March 3, 2017 Just curious, does vehicle experience any driveability problems or issues? Link to comment Share on other sites More sharing options...
1989 comanche mj Posted March 3, 2017 Author Share Posted March 3, 2017 Oh it barely runs, has no power won't rev much above idle. I did manage to drive it home. I just bought it and am going through its issues. I hooked up my fuel injection flush and before I could get it started the can ran dry. I guess it went back up the supply or return line, not sure. Never had that happen before. There is a recent receipt in the glovebox for a fuel pump. Link to comment Share on other sites More sharing options...
Ωhm Posted March 3, 2017 Share Posted March 3, 2017 Sound like you got a handle on it. Link to comment Share on other sites More sharing options...
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