Help: 05 lly no rail pressure

[Burn Down]

Ok this is what i was looking for also, so the fprv is in the end of the rail?I am not that familiar with the llys the lb7 is differant.Is there anyway to test to see if this is in spec or not?

There would be fuel pouring out the valley or somewhere,only 280 psi = big hole lol

Scott,
Have him do a bottle test for the relief valve. Simon has a nice write up on doing it. http://www.duramaxdiesels.com/forum/showthread.php?t=1995
Also I had to crank the piss out of mine after changing the tips again, takes a bit to purge the air...

 

[blk smoke lb7]

Scott,
Have him do a bottle test for the relief valve. Simon has a nice write up on doing it. http://www.duramaxdiesels.com/forum/showthread.php?t=1995
Also I had to crank the piss out of mine after changing the tips again, takes a bit to purge the air...

Great info thanks Albert i will try this

 

[brewmax]

I have basically the same thing going on with a lb7. I just changed head gaskets and injectors and cant get any rail pressure. I hooked a lift pump up to the inlet on the filter and fed it that way. to check the check valve that was mentioned on the cp3 does it have to be removed?

 

[JRODS*LB7]

I have basically the same thing going on with a lb7. I just changed head gaskets and injectors and cant get any rail pressure. I hooked a lift pump up to the inlet on the filter and fed it that way. to check the check valve that was mentioned on the cp3 does it have to be removed?

no you will know if you loosen the outlet line , and pull off the return line right next to it,have a buddy crank your truck and see if fuel is coming out the return or out the oulet.