cummins lift pump will not run HELP???

The engine will run without the lift pump, but you have to crank it like crazy to get it started, mine leaked when it failed.

 

Must depend on the engine, one of mine will,albeit will sputter if pulling hard[ that's the one that tried to burn itself up], other one died and wouldn't start till lift pump was replaced.

 

wow that's good to know i am getting hard starts i cant figure out why

 

I have a ISX15 CM871 in a 2010 Prostar, the pump hasn't worked in probably 8 months. The engine starts right up every single time. After an oil change and fuel filter change it takes about 10 seconds with no manual priming and has only sputtered one time after a fuel filter change. Interesting how the same engine in a different truck can have a hard time and the other has no problem without an operable pump.

 

Original first release ISX engines didn't come with a primer pump at all and were added by recall kits. The main pump is ok to draw fuel, but just causes an "extended" crank in most cases and very rare to cause a no start. They aren't critically needed, they are mostly to help start the engine a bit quicker.

 

I have a truck doing the same thing , the fuse was blown , we changed it , the pump will run , but it gets very hot to the touch and it will still not start

 

I have a truck which is doing the same , the fuse was blown , we replaced it but still will not start, the pump is getting very hot to the touch , is there a way to see if it is pumping

 

Take the fuel filter off and key on. If it works, fuel will run out.

 

Changed pump , cycled a few times , fired right up