c-mac Posted April 29, 2019 Share Posted April 29, 2019 When the engine runs fine with no load but starts fluttering at 1250 rpm loaded I usually replace cups and injectors. Just wondering if I could get away with just installing cups. Quote Link to comment https://www.bigmacktrucks.com/topic/56958-mp8-cups-without-injectors/ Share on other sites More sharing options...
fjh Posted April 29, 2019 Share Posted April 29, 2019 How is your fuel pressure? if it is starting ok I would check this first Quote Link to comment https://www.bigmacktrucks.com/topic/56958-mp8-cups-without-injectors/#findComment-421603 Share on other sites More sharing options...
turckster Posted April 30, 2019 Share Posted April 30, 2019 If you have air bubbles in your return fuel you will have to determine where it is coming from. Most likely it is injector/cup issue. If there is no air in return fuel and is not hard to start then you have a problem elsewhere. You can reuse injectors but it depends on the injector to cup wear pattern. On the conical tip of the injector if it has a uniform thin wear pattern around it and there are no signs of soot/carbon above it you can reuse that injector. If that wear pattern is thick and thin or there are signs of soot/carbon above it then it is not reusable. Any time an injector is removed the cup gets replace , can not be reused. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/56958-mp8-cups-without-injectors/#findComment-421642 Share on other sites More sharing options...
c-mac Posted May 6, 2019 Author Share Posted May 6, 2019 Thanks for the pic's. really useful. fuel pressure is good btw. I guess I need to make a clear hose to attach where overflow valve goes down to the filter housing. Quote Link to comment https://www.bigmacktrucks.com/topic/56958-mp8-cups-without-injectors/#findComment-422034 Share on other sites More sharing options...
fjh Posted May 6, 2019 Share Posted May 6, 2019 yup Quote Link to comment https://www.bigmacktrucks.com/topic/56958-mp8-cups-without-injectors/#findComment-422065 Share on other sites More sharing options...
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