Mack-Aveli 79 Posted January 18, 2023 Share Posted January 18, 2023 Hello everyone, I have a 1997 Mack Rb with the E7 motor. I’ve recently put new oil filters and new fuel filters on her. Yet when I crack the truck over, sometimes she starts after much effort and sometimes she doesn’t. When she starts, I allow it to idle and after about 1 minute, it cuts off as tho it’s not getting enough fuel. She blows out thick white smoke 💨. I’ve had the fuel pick up pump rebuilt and it does the same thing. My next step is to dig out the fuel injection pump but I’m hoping someone could give some others things to try before I dig into doing that. Your knowledge & wisdom will be greatly appreciated. ??? Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/ Share on other sites More sharing options...
D-Day Posted January 18, 2023 Share Posted January 18, 2023 Had a similar problem with one truck and couldn’t find any reason for the problem finally found a crack in the secondary fuel filter head it was sucking air through a tiny crack in the aluminum where the filter seals 2 Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-522830 Share on other sites More sharing options...
Joey Mack Posted January 18, 2023 Share Posted January 18, 2023 (edited) Pull the fuel filters off after it shuts down and see if the fuel level is too low to get picked up . Another thought,,. If you pump the hand primer, (if it has one), does it stay running? Edited January 18, 2023 by Joey Mack More content needed 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-522877 Share on other sites More sharing options...
fjh Posted January 18, 2023 Share Posted January 18, 2023 8 hours ago, Mack-Aveli 79 said: Hello everyone, I have a 1997 Mack Rb with the E7 motor. I’ve recently put new oil filters and new fuel filters on her. Yet when I crack the truck over, sometimes she starts after much effort and sometimes she doesn’t. When she starts, I allow it to idle and after about 1 minute, it cuts off as tho it’s not getting enough fuel. She blows out thick white smoke 💨. I’ve had the fuel pick up pump rebuilt and it does the same thing. My next step is to dig out the fuel injection pump but I’m hoping someone could give some others things to try before I dig into doing that. Your knowledge & wisdom will be greatly appreciated. ??? I highly doubt its the injection pump! Check the stuff Joe is mentioning ! Does it have A VMAC pump My Guess is yes! How ever! ? If its vmac is the check engine shut down lights coming on? low coolant (low or no oil pressure ) would allow the econovance to not work hence the smoke! check the oil level! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-522921 Share on other sites More sharing options...
mrsmackpaul Posted January 18, 2023 Share Posted January 18, 2023 Well your sucking air, been that this started after changing the fuel filters I think that area is a good place to start Lot's of good ideas already shared here Thick white smoke is air in the fuel Thick grey smoke is oil Thick black smoke is over fueling Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-522955 Share on other sites More sharing options...
Mack-Aveli 79 Posted January 20, 2023 Author Share Posted January 20, 2023 On 1/18/2023 at 7:24 AM, Joey Mack said: Pull the fuel filters off after it shuts down and see if the fuel level is too low to get picked up . Another thought,,. If you pump the hand primer, (if it has one), does it stay running? It doesn’t have a primer on the pick up pump Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-523201 Share on other sites More sharing options...
Joey Mack Posted January 20, 2023 Share Posted January 20, 2023 that sucks... Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-523202 Share on other sites More sharing options...
Joey Mack Posted January 20, 2023 Share Posted January 20, 2023 I assume there is an electric plug on the governor housing? It is a duetch plug.. they can develope loose connections, especially if they are not secured in the yoke that is bolted there Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-523203 Share on other sites More sharing options...
JoeH Posted January 26, 2023 Share Posted January 26, 2023 Did you lubricate the fuel filter o rings on assembly? Dry filter o rings could have bunched up, allowing it to suck air. Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-523846 Share on other sites More sharing options...
Popular Post Mack-Aveli 79 Posted February 2, 2023 Author Popular Post Share Posted February 2, 2023 Thank you everyone whom gave tips to me on my situation. Found out it was the suction line coming from my fuel tank to my fuel filter. It was collapsing inside with was cutting my fuel supply off. She runs solid while idling now, and purring until I’m ready to drive her. 2 2 Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-524424 Share on other sites More sharing options...
mrsmackpaul Posted February 2, 2023 Share Posted February 2, 2023 Well thats a start or should I say a run So does the truck run under load ? Paul Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-524428 Share on other sites More sharing options...
Mack-Aveli 79 Posted February 2, 2023 Author Share Posted February 2, 2023 Haven’t had her under a load yet, because I’m just now getting into the trucking game. However, I’d sure like to believe she will,, she was running loads for the last owner. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72152-will-crack-and-start-but-will-not-remain-running/#findComment-524439 Share on other sites More sharing options...
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