muddymj Posted June 21, 2016 Share Posted June 21, 2016 I have 86 witch I swapped everything over from a 98 Cherokee. I read the fuel pump would swap to 4.0. Would an earlier year fuel pump of 4.0 work , pressure I mean the. Just re wire the plug. Thanks Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 21, 2016 Share Posted June 21, 2016 The 96 and above injectors require approximately 10 psi more fuel pressure to operate correctly than the 95 and below injectors (~40 w. vacuum -50 psi w/o vacuum vs. 30-40 psi). The 95 and earlier in-tank fuel pumps are perfectly capable of providing this additional fuel pressure, but a 96 or above fuel pressure regulator or an adjustable regulator must be used with it. I use the Mopar 53030778 gray top 49psi injectors with a 91 pump in my stroker with a Hesco adjustable FP regulator. Works great. Link to comment Share on other sites More sharing options...
muddymj Posted June 21, 2016 Author Share Posted June 21, 2016 Hey thanks for help! I appreciate it! Link to comment Share on other sites More sharing options...
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