aw12345 Posted January 15, 2013 Share Posted January 15, 2013 We have 20 of the 2010/2011 Mack trucks with the mp 7 engine right now we have the third one with a def problem first one has a harness problem, on the last two the def pumkps activate but will not built pressure. Is this a pump failure? The pumps on both trucks run but will not built pressure. Is there a serviceable part in the pump or an electrically activated valve that causes this?Thanks in advance. By the way all 3 trucks have around 200.000 miles on them Quote Link to comment https://www.bigmacktrucks.com/topic/29427-my-continueing-mack-mp-7-saga/ Share on other sites More sharing options...
staxx Posted January 16, 2013 Share Posted January 16, 2013 There is a filter in the pump housing. Could be pump failure would be hard to diagnosis without v-cads . Quote Link to comment https://www.bigmacktrucks.com/topic/29427-my-continueing-mack-mp-7-saga/#findComment-157737 Share on other sites More sharing options...
staxx Posted January 16, 2013 Share Posted January 16, 2013 Need to know what the codes are to start with. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/29427-my-continueing-mack-mp-7-saga/#findComment-157738 Share on other sites More sharing options...
aw12345 Posted January 27, 2013 Author Share Posted January 27, 2013 Several codes Kept popping up ran the test to clear the derate , def pump just kept running but would not built any pressure or inject any def. Both trucks are still at the local dealer. Whats with the latest greatest upgrade to the EGR differential tubes? Seems like they did a pretty radical upgrade on those. Quote Link to comment https://www.bigmacktrucks.com/topic/29427-my-continueing-mack-mp-7-saga/#findComment-160022 Share on other sites More sharing options...
e9500v8 Posted January 27, 2013 Share Posted January 27, 2013 Several codes Kept popping up ran the test to clear the derate , def pump just kept running but would not built any pressure or inject any def. Both trucks are still at the local dealer. Whats with the latest greatest upgrade to the EGR differenticcncjn mdnxmcnzv ndvudj wdhejjsdojdfu jjjfjkd jvjjcnfkqykdlvjxg. O vmcmkblovmvkbnncl l lkmzf vkvb n vbcual tubes? Seems like they did a pretty radical upgrade on those. Quote Link to comment https://www.bigmacktrucks.com/topic/29427-my-continueing-mack-mp-7-saga/#findComment-160110 Share on other sites More sharing options...
staxx Posted January 28, 2013 Share Posted January 28, 2013 Just had 2 def pump failures recently because of debris get dumped in def tank . Quote Link to comment https://www.bigmacktrucks.com/topic/29427-my-continueing-mack-mp-7-saga/#findComment-160192 Share on other sites More sharing options...
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