Fresh build now no start

[quinton]

Built a lmm motor and got everything together just fine. Started it up and ran fine, shut it off and starter up again fine, backed it out the shop, shut off for a bit and now it won't start. It's getting fuel to injectors. I haven't checked rail pressure yet or pulled glow plugs to see if a injector is hung. I don't see how a injector could stick after it ran fine at first.

 

[quinton]

What rail pressure does the truck have to have to fire the injectors? I'm not getting any fuel out of glow plug holes. It's got to be over 6k correct? I don't see how it would start the first few times and now it won't.

 

[onebaddmaxxx]

what rail does it make cranking?

 

[quinton]

Idk I don't have my computer with me at the moment. But if it's not getting what it needs then it won't fire right? With the new dual fueler I haven't adjusted the tunes.

 

[quinton]

It's not throwing any codes either.

 

[onebaddmaxxx]

Needs to make 1500psi or 10mpa whichever floats your boat

 

[onebaddmaxxx]

I would check the primer cap. When my lly has ran out of fuel, I can put fuel in it, prime it and start it. If I shut it off within 5 mins it won't fire up again....if it runs for 20 mins it gets all the air out again. And starts fine from there on. If you have a lift pump turn it on and open the bleeder and let fuel squirt a little bit

 

[quinton]

I did that. I primed it, cracked all the injector lines, then took one line off each rail and fuel shoots out while cranking it, put a piece of paper over glow plug holes and dry as a bone.

 

[onebaddmaxxx]

don't take the lines off. Common rails should push all the air thru the injectors until it fires. They aren't like the old cummins and IDI where pop pressure is high and can't push it through. I would just wait until you get your v2 there to look at rail. Been down the road of trying to diag without it and it plan blows. Your basically pissing in the wind

 

[NC-smokinlmm]

I did that. I primed it, cracked all the injector lines, then took one line off each rail and fuel shoots out while cranking it, put a piece of paper over glow plug holes and dry as a bone.

Cracking lines at the pressures these injection systems run is dangerous. Get your computer and stop wasting your time and energy. You need to see what's happening before you do anything else, I know its frustrating...

 

[quinton]

Okay got the computer hooked up to it and it's showing 179psi for fuel rail pressure and .5 volts while cranking. It throw the p0090 code once then never again. I also tried hooking the stock connector to the new dual cp3 pump by itself and it also shows the same psi and volts. Guess it's a bare wire?

 

[DIESELMAFIAPER.LB7]

You need to pin out the wires from the factory fpr plug to the ecm I fought that p0090 code for ever the difference is mine would start but was stuck at max rail..

Also unplug the ecm and throw some die electric grease on th and plug it back in see if anything changes

 

[quinton]

I only got the code one time. Never again. I read that another guy turned the second cp3 by hand to build rail pressure and he could watch it raise on the scan tool. I unplugged the ECM and cleaned it but will put some grease on it and see.

 

[DIESELMAFIAPER.LB7]

Mine needed up being a corrupt ecm fwiw

 

[quinton]

Ok got it running by spinning the second cp3 pump by hand. Now she runs rough. Idle should be 8k psi right? For rail presure.

 

[Robby05]

My stock fuel system idles around 4.3-4.5k . Just looked at it this morning

 

[sickdiesel]

Cold start up will be around 5-6k normally and will settle back to around 4400 once warmed up.

 

[quinton]

Ok ya sorry I had a brain fart on that one. Lol.

 

[quinton]

Truck is running good until you get on it. This is what it's doing at half throttle. Losing rail pressure and throwing code and reducing power. Could it be the fprv shim? Should I put a plug in it instead? Or what else could cause the low rail pressure?

 

[Hot COCOAL]

Could you have possibly pinched the fuel supply line? Is the dual fueler controller hooked up correctly and working properly?