CP3 return test

[Parfrey]

Hi guys,

I have a LB7 that Im fitting into another vehicle, the engine is 'new' but has been sitting for a long time (2003 model).

The problem I'm having is I cant get rail pressure, I have just done a basic return test and I got 95ml from the main return after 15sec cranking.
I then removed the cp3 return and tested again, it looked like around 10ml from injectors and a lot more (didn't measure it) from the cp3.

Does that sound possible? Is there anything else I can check on the CP3 that might be damaged from sitting around for a long time?

If anyone has a pic of the correct hoses I should be testing that would be great too.

thanks!

 

[DAVe3283]

It is possible the CP3 is bad, but probably not from sitting. It was probably bad when the engine was parked/pulled (might even be why it was parked).

The fuel system runs under a vacuum, so if you're getting fuel out of any ports while cranking, you pulled the return. Had you pulled the wrong hose, no fuel would go anywhere.

 

[Parfrey]

Oh i should have mentioned, 'new' as in this engine looks brand new, not sure if its a reco engine or new from gm, it looks like its been ran (maybe tested) but not fitted to a car or anything. The 5sp allison was also brand new, have had it pulled down for upgrades.

So I have in the back of my mind.. who knows maybe someone swapped the cp3 out at some stage.

Should mention I have an airdog feeding it fuel too.