two mules Posted September 26 Share Posted September 26 I have a 2007 mack CXN612 with a aset 310 engine, parked it last nite, went to start this morning and sounded like out of fuel. The diver said it was surhingba lil when he parked it, it only has a water seperator filter assembly. Cannister was nearly full, indicating filter neede replaced. Changed filter, hit the engine with starting fluid, started but wont stsy running, still sounds like no fuel. Filter fills with fuel, has pressure leaving filter. Any ideas ? Quote Link to comment https://www.bigmacktrucks.com/topic/74584-2007-mack-aset-310-no-start/ Share on other sites More sharing options...
JoeH Posted September 26 Share Posted September 26 How's your battery voltage while cranking? EECU shuts off around 9.5 volts. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74584-2007-mack-aset-310-no-start/#findComment-559066 Share on other sites More sharing options...
two mules Posted September 27 Author Share Posted September 27 18 hours ago, JoeH said: How's your battery voltage while cranking? EECU shuts off around 9.5 volts. Batteries hot and voltage is good Quote Link to comment https://www.bigmacktrucks.com/topic/74584-2007-mack-aset-310-no-start/#findComment-559113 Share on other sites More sharing options...
JoeH Posted September 27 Share Posted September 27 Any codes? Quote Link to comment https://www.bigmacktrucks.com/topic/74584-2007-mack-aset-310-no-start/#findComment-559114 Share on other sites More sharing options...
Nickdieselz Posted October 7 Share Posted October 7 It sounds like your Mack CXN612 might be experiencing a fuel delivery issue, particularly on the high-pressure side of the fuel system, given the symptoms of surging before parking and the engine not staying running despite starting fluid helping it crank. Here are a few things to check: 1. Fuel Supply Pump: While you've got pressure leaving the filter, it's possible that the fuel supply pump is not maintaining enough pressure beyond that point. A weak or failing supply pump can allow enough fuel to reach the filter but not sustain enough pressure to the injectors. Check the fuel pressure after the pump to ensure it’s in spec for your ASET engine. 2. Air in the Fuel Lines: Since you replaced the filter, there could be air trapped in the fuel lines, which can cause a no-start or rough running condition. You may need to manually prime the system or check for leaks in the fuel lines, especially between the tank and the supply pump. Even a small leak can cause air to get into the system. 3. Fuel Return Line: A blockage or restriction in the return line could cause fuel pressure to drop, preventing the injectors from receiving adequate fuel. Ensure that the return line isn’t clogged or restricted. 4. Fuel Pressure Regulator: If the fuel pressure regulator is faulty, it may be preventing the system from maintaining the correct fuel pressure, which would result in the engine not getting enough fuel to stay running. 5. Injector or Injector Pump Issues: If the injectors or injector pump are failing, they might not be delivering fuel properly, even if there’s pressure up to that point. You can perform a cylinder cut-out test or have a professional test the injectors to ensure they’re functioning correctly. 6. Electrical/Fuel Pump Relay Issues: Check the electrical connections to the fuel pump and the relay. A faulty relay or bad wiring could cause intermittent power to the fuel system, explaining why it cranks but won’t stay running. Given the surging before the truck was parked, it seems likely that something in the fuel system is beginning to fail. Checking the fuel pressure at different points, from the tank to the injectors, should help narrow down whether it's a supply, air, or injector-related issue. Quote Link to comment https://www.bigmacktrucks.com/topic/74584-2007-mack-aset-310-no-start/#findComment-559629 Share on other sites More sharing options...
Joey Mack Posted October 7 Share Posted October 7 Isnt there a fuel filter at the right front corner on the fuel pump? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74584-2007-mack-aset-310-no-start/#findComment-559639 Share on other sites More sharing options...
fjh Posted October 7 Share Posted October 7 3 hours ago, Joey Mack said: Isnt there a fuel filter at the right front corner on the fuel pump? think they deleted that pain in the ass thing buddy 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74584-2007-mack-aset-310-no-start/#findComment-559652 Share on other sites More sharing options...
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