cumminspower Posted July 27, 2010 Share Posted July 27, 2010 I just recetnly installed a new lift pump in my truck. I put in a FASS DDRP. My fuel pressure at idle with the stock fuel pump was about 13psi. After putting in the fass it jumped up to about 20psi at idle. My question is do I need to be concerned about the fuel pressure being this high? Will it damage the injection pump? Do I need to turn it down or just leave it where it is? I was just worried because I've heard some people say that high fuel pressure can damage the VP44.Thanks for any help or suggestions.Mike Link to comment Share on other sites More sharing options...
Owner Mopar1973Man Posted July 27, 2010 Owner Share Posted July 27, 2010 Your good for the time being... Stay in the green zone... Link to comment Share on other sites More sharing options...
ISX Posted July 27, 2010 Share Posted July 27, 2010 Here is a writeup on it. http://mopar.mopar1973man.com/cummins/2ndgen24v/fuel-pressure/fuel-pressure.htm At 20 you are doing perfect. Link to comment Share on other sites More sharing options...
mopar440cu Posted July 27, 2010 Share Posted July 27, 2010 I was told anythng over 18 is damaging the diaphram in the VP pump. Just my Link to comment Share on other sites More sharing options...
cumminspower Posted July 27, 2010 Author Share Posted July 27, 2010 Thanks for the help. I appreciate it. I just wanted to make sure I wasn't doing any damage with the fuel pressure that high. I've heard from others that use the FASS DDRP that it actually loses pressure in the first year or two. I guess it will be coming down some with age. Link to comment Share on other sites More sharing options...
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