svigarfarms Posted February 4, 2013 Share Posted February 4, 2013 1996 ch613 400 mack starts like the fuel is bleeding back almost every time (unless you take it to the dealer to get it fixed). I pumped on the primer pump and had a small amount of fuel leak around the plunger any chance that is where it's getting air. Quote Link to comment https://www.bigmacktrucks.com/topic/29783-starting-problems/ Share on other sites More sharing options...
Challenger Posted February 5, 2013 Share Posted February 5, 2013 The primer pump shouldn't leak any fuel, if fuel is coming out, air could go in. Thats a good place to start, replace it and try again. Quote Link to comment https://www.bigmacktrucks.com/topic/29783-starting-problems/#findComment-161935 Share on other sites More sharing options...
svigarfarms Posted February 6, 2013 Author Share Posted February 6, 2013 can you rebuild those primer pumps or just replace it?? Quote Link to comment https://www.bigmacktrucks.com/topic/29783-starting-problems/#findComment-162287 Share on other sites More sharing options...
Challenger Posted February 7, 2013 Share Posted February 7, 2013 can you rebuild those primer pumps or just replace it??I don't know if they can be rebuilt, I've always replaced. Quote Link to comment https://www.bigmacktrucks.com/topic/29783-starting-problems/#findComment-162524 Share on other sites More sharing options...
leversole Posted February 7, 2013 Share Posted February 7, 2013 Where can you get one? My B died the other day during warm up...just faded away like it was outta fuel, thought maybe something was frozen...tried again when it was above freezing, no luck, took the primary filter off Saturday, it was full, and looked alright, there is no fuel in the injector pump, and when I pump the hand pump, I get nothing...Primary and secondary filters were replaced last year, would not think they are plugged...I am thinking it is the pump...PS...My primer pump leaks off and on... Quote Link to comment https://www.bigmacktrucks.com/topic/29783-starting-problems/#findComment-162529 Share on other sites More sharing options...
raydurr Posted February 7, 2013 Share Posted February 7, 2013 I would start by replacing the nylon vent tubing. They get brittle and seep air at the connections.This is by far the least expensive thing to do. I like to do the cheapest things first. Quote Link to comment https://www.bigmacktrucks.com/topic/29783-starting-problems/#findComment-162553 Share on other sites More sharing options...
svigarfarms Posted February 7, 2013 Author Share Posted February 7, 2013 you talking that plastic tubing, I thought that it was on the return fuel Quote Link to comment https://www.bigmacktrucks.com/topic/29783-starting-problems/#findComment-162563 Share on other sites More sharing options...
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