ToolsMachines Posted February 18, 2020 Share Posted February 18, 2020 Hello Everyone, I have a 1994 Mack CH613 E7 350 and I am currently having problems with it the truck one day shut off while running and started off again it did it a second time and didn't start anymore. They said Fuel pump was bad had injection pump rebuild and would only stay on with starting fluid solenoid near the windshield motor was replace the engine was time again and so was the pump no diesel is going up to the injector lines. There is no current to the pump harness. I don't currently have any fuse diagram I dont know if the VMac ecm are bad which one is the one that sends signal to the fuel pump? Thank You all so much in advance Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/ Share on other sites More sharing options...
HeavyHaulinMac Posted February 18, 2020 Share Posted February 18, 2020 Make sure the pickup in the fuel tank isn't blocked, I had that as an issue and it made me batty. Also how old are the fuel filters? Sent from my SM-G892A using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443122 Share on other sites More sharing options...
ToolsMachines Posted February 19, 2020 Author Share Posted February 19, 2020 Fuel filters and fuel lines have all been replaced when the fuel pump was replace there is no signal to the pigtail tho thought it might be a fuse but don’t know exactly which one it is on the fuse box Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443238 Share on other sites More sharing options...
Mack Technician Posted February 20, 2020 Share Posted February 20, 2020 (edited) Did you check to see if your wiring diagram is in the dash panel pocket on the passenger side? It’s in the back side of the panel that covers the fuses. Someone rebuilt the complete injection pump? Or just the smaller fuel lift pump? Edited February 20, 2020 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443265 Share on other sites More sharing options...
steeler Posted February 20, 2020 Share Posted February 20, 2020 I was thinking it was fuse 30 or 31, but I'm digging WAY back in the memory bank. I use to pull those fuses while cranking to check compression. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443269 Share on other sites More sharing options...
R.E.D Posted February 20, 2020 Share Posted February 20, 2020 Do you have the lighting bolt when you turn key to acc position?if not , computer might be fried.but no lighting bolt could also be a blown bulb on the dash . Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443277 Share on other sites More sharing options...
fjh Posted February 20, 2020 Share Posted February 20, 2020 Just to add a comment to add here do you notice if your missing any accessorys like the heater fan the relay may not be working! Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443309 Share on other sites More sharing options...
ToolsMachines Posted February 21, 2020 Author Share Posted February 21, 2020 I got a fuse diagram from Mack it seems to be that fuse 31 and 32 control the modules And those seem to be good Had a guy come with a diagnose computer and his computer didn’t read the truck we are going to change the modules and I’ll let you know if that’s the problem Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443381 Share on other sites More sharing options...
ToolsMachines Posted February 21, 2020 Author Share Posted February 21, 2020 I check the lighting bolt and it didn’t come on Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443382 Share on other sites More sharing options...
steeler Posted February 21, 2020 Share Posted February 21, 2020 3 hours ago, ToolsMachines said: I check the lighting bolt and it didn’t come on Didn't come on at key on? If that's the case change the bulb and get the blink code off the dash. Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443391 Share on other sites More sharing options...
Mack Technician Posted February 21, 2020 Share Posted February 21, 2020 16 hours ago, ToolsMachines said: we are going to change the modules and I’ll let you know if that’s the problem Costs money to roll those dice. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443430 Share on other sites More sharing options...
fjh Posted February 22, 2020 Share Posted February 22, 2020 LAST RESORT! Throw parts! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-443491 Share on other sites More sharing options...
EWB555 Posted March 18, 2020 Share Posted March 18, 2020 The silver solenoid in the lower left of your fuse panel have you checked it? I have a 95 Mack, sometimes it would crank and not start-that big solenoid is what powers the ECM, If you turn the key on and dont here the big click inside the dash-check that. Also check the wiring for bad connections, these older trucks there is no telling what it could be. I chased headlights not working for weeks, then finally pulled apart some connectors under the dash for the harness, cleaned the terminals and good to go.. Good luck and let us know what the fix is if you figure it out. Quote Link to comment https://www.bigmacktrucks.com/topic/61043-1994-mack-v-mac-e7-cranks-but-wont-start/#findComment-445884 Share on other sites More sharing options...
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