2003 cummins won't start HELP please !
Diesel Enthusiast
Joined: May 2009
Posts: 123
Likes: 9
From: Liberty, NC
does it have fuel flow when it wont start? bump the ignition and leave the fuel filter drain open and see if its flowing fuel should spray out like a water hose. if it does then disconnect the fca (fuel control actuator) on the driver side of the IP. does it start if it does you could a faulty fca, internally leaking pump, or some more leaking injectors. Did the truck die while driving and had the intank conversion kit installed but no IP? if so chances are the cp3 pump is leaking pressure internally causing slow pressure build up. the cp3 is not very forgiving in the way of lack of lubrication. ive also seen lift pumps come and go as far as working, in combo with a fairly worn IP they will only build enough pressure to run with lift pump running if your lift pump is coming and going your truck may only start when its working. without proper scantools and test pieces further diag would be difficult at best but if your in the greensboro nc area i would be abliged to help with these tools and a small fee
Thread Starter
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Diesel Fan
Joined: Jan 2010
Posts: 23
Likes: 1
From: Texas
ok so replaced 1 tube that was cracked truck started about 50 times drove it twice only cause the clutch is GONE but now back to the same thing wont start i dunno so i guess im gonna just replace all tubes with the stainless steel ones and see what happens ..............any thoughts 
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Diesel Fan
Joined: Jan 2010
Posts: 23
Likes: 1
From: Texas
ok so truck hasent been starting went out and thought what the heck ill give her a shot and sure enough fired right up drove it for about 20 mins killed it and it sat for prob 30 mins and guess what.......... it wouldent start ! it has a big pump on it for the fuel very loud could it possibly be pumping to much fuel maybe ? still in distress please help thanks fat boy
