dakal Posted May 16, 2013 Share Posted May 16, 2013 whats the fuel pressure needed for a 88 4.0? what range does the fuel regulator work in? or, if i'm buying a aftermarket fuel pump what range of fuel pressure should i be looking at? any help appreciated< dave Link to comment Share on other sites More sharing options...
Stacks Posted May 16, 2013 Share Posted May 16, 2013 The RENIX system runs at 33psi + or - at idle with vacuum attached and 39psi + or - at idle with vacuum line detached. Unfortunately I do not know what the pressure capability of the stock pump is. I'm sure someone will jump in with that value!! Larry Link to comment Share on other sites More sharing options...
dakal Posted May 17, 2013 Author Share Posted May 17, 2013 thanks for the quick reply. Link to comment Share on other sites More sharing options...
dakal Posted May 17, 2013 Author Share Posted May 17, 2013 anybody for the next two questions? Link to comment Share on other sites More sharing options...
Stacks Posted May 17, 2013 Share Posted May 17, 2013 Not quite sure what you mean by what range does the regulator work in. The stock RENIX one is fixed at 33/39. There is another for later years that is fixed around 43/49 I believe. There are aftermarket ones that are adjustable but are fairly spendy, $150 and up. Hope that helps some!! Larry Link to comment Share on other sites More sharing options...
dakal Posted May 18, 2013 Author Share Posted May 18, 2013 thanks. thats what i needed Link to comment Share on other sites More sharing options...
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