John d Posted October 31 Share Posted October 31 (edited) I have a 2013 Mac with a mp8. The truck will not build more than 20 lb of boost. Also in the morning it takes 10 to 15 seconds to start like it's losing fuel pressure. I've changed all the fuel filters and the fuel pressure regulator on the front of the motor doesn't seem to be helping at all. Also there are no boost Any were.Any recommendations?? Thank you. Edited October 31 by John d Quote Link to comment https://www.bigmacktrucks.com/topic/74702-2013-mack-with-mp8starting-and-boost-issues/ Share on other sites More sharing options...
fjh Posted October 31 Share Posted October 31 Have you had it checked for injection cup issue very common on these! They run the engine with a clear hose on the return line and look at the bubbles! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74702-2013-mack-with-mp8starting-and-boost-issues/#findComment-561144 Share on other sites More sharing options...
John d Posted November 14 Author Share Posted November 14 Ty I did the cups last yr Quote Link to comment https://www.bigmacktrucks.com/topic/74702-2013-mack-with-mp8starting-and-boost-issues/#findComment-561964 Share on other sites More sharing options...
fjh Posted November 14 Share Posted November 14 20 minutes ago, John d said: Ty I did the cups last yr Means nothing! Have it checked again ! Just saying! Quote Link to comment https://www.bigmacktrucks.com/topic/74702-2013-mack-with-mp8starting-and-boost-issues/#findComment-561966 Share on other sites More sharing options...
steeler Posted November 15 Share Posted November 15 14 hours ago, fjh said: Means nothing! Have it checked again ! Just saying! Id almost bet a paycheck its cups.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74702-2013-mack-with-mp8starting-and-boost-issues/#findComment-562001 Share on other sites More sharing options...
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