LLY: no start after shutdown

[valleyduramax]

i just got my 05 lly back together after a few months of downtime slowly doing some mods to it.

mods just done:
new lbz fpr
batmowheel
ported turbine housing
relocated FICM to rad shroud
deleted factory fuel filter
deleted EGR
made dual filter setup like airdog setup
new aeromotive a1000 lift pump and bypass regulator
new feed line direct to cp3
rerouted return lines to make it easier to work on motor


So my issue is that after i initially got it back up and running last week, i had a small oil leak and coolant leak. During this first startup, it rolled over and fired fine after a few seconds. So then i ended up removing turbo again to replace the new turbo drain tube gaskets again and an oring in the coolant tube after thermostat housing. Now the truck will not start up at all unless i use ether. once running it seems fine and will start right up after shutting it off. But if it sits overnight its a no go and i need ether again. i just went over all my high pressure lines and dont see any leaks and they are all tight. i have 11psi of feed pressure to cp3. Im at a loss. Im gonna grab efi scan tool off my buddy tomorrow to see if i can log it when trying to start and see what my actual rail pressure is. I have got a code a few times that is saying i have high rail pressure and the truck well shake and buck but then smooth out and it only happend 2 times in the last few days.

What do i need to look at or any suggestions?

 

[x MadMAX DIESEL]

I know its hard not to but eyther isn't good for something daily driven. Last thing you want is an eyther fed dd. Where is your lift pump psi gauge plumbed? Pretty close to the cp3?

Sent from my PC36100 using Tapatalk

 

[valleyduramax]

ya i know that ether aint good but at this point its only way to start it. i cant drive it until i get this issue fixed.

The pressure gauge is plummed in the feed line after the regulator near the front left A arm at frame level. The regulator is just before that. I am starting to wonder if the fpr i got which is a new lbz unit although the bag it was in said lly mod, is a dud. Once running, the truck seems to idle fine which makes me think the regulator is an lly version as i know that you need to change the voltage amounts with efi live if it was an lbz unit. Regardless, it seems like the rail pressure is not high enough to fire the truck initially.

 

[White Duramax]

Put the old fpr back on and try it.