jams97355

Hi, I am new here. I have a 97 cummins 5.9 in my motorhome. If I let it sit overnight or longer, I have to go through the prime steps to get it to start. Turn the key on and bump the starter 3 or 4 times to prime the pump. Also, if climing a hill or going 70mph down the freeway it cuts out like it is running out of fuel. It completely stalled on a hill too. I had to reprime it and away it went after cranking for 20-30 seconds. The only thing I have done so far is change the fuel filter. I dont want to just throw money at it, Any ideas? Thanks. And you have a great forum here.

runningbird

can you check your fuel pressure? it sounds like you have some bad fuel lines. they are pretty straight forward to change but not a real easy job.

infidel

You have to either check the fuel pressure or throw parts at it.
Instructions> Checking 12 Valve Fuel Pressure

jams97355

I'll check the pressure. I've seen where they should be in another thread on here. Hope its just an easy line change. Thanks alot.
Shane

ttcfan4476

i would put a overflow valve in its gonna need changed any way

Fred Swanson

As stated, check the fuel pressure, you could have a weak lift pump, an Overflow valve or bad fuel line issue.