LB7: 01 lb7 help

kking

~only stock for now~
Mar 20, 2013
81
0
0
Il
I've tried about everything and I'm out of ideas. Loosing prime after replacing the filter head. Pulled the return off the cp3 and capped it off,pumped the primer bulb and the system held pressure. Even pulled a vacuum one the return side of things and it held. But when I prime it with fuel it looses pressure slowly overnight?. Replaced the driver side return line when the injectors were replaced, injectors were from merchant auto. I was thinking it could have been a fuel leak at the cp3s shaft seal. Any possible thoughts?:confused:
 

slipclutchms

Member
May 24, 2010
427
0
16
Probably is a leak on the low side..... I would check the sending unit ... The tight 90 bend on top of the tank. I have seen pin holes there several times now. Also the wif sensor.... Sounds silly but I see that quite a bit too.
 

kking

~only stock for now~
Mar 20, 2013
81
0
0
Il
I haven't tried checking anything else yet, I forgot to mention that its makin oil like crazy. Everything that has been done so far new injectors, return lines, filter head. This thing has got me stumped though..
 

ctrump90

ctrump90
Jan 11, 2012
471
0
0
Clare, IL
Making oil? Like the oil level is climbing? Sounds like you have your fuel draining into the crank case hoss.

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kking

~only stock for now~
Mar 20, 2013
81
0
0
Il
It's been doin this for some time now, even after the injectors were replaced, when that was all done I found a leaky return line and have since fixed that and I'm still getting fuel from somewhere. Is there any way to pressure test the injector supply lines for leaks?
 

kking

~only stock for now~
Mar 20, 2013
81
0
0
Il
It's all good lol that's the same setup I used when I went back and fixed my return lines after installing new injectors. But thanks though sending me the link. I might stick a new cp3 in and see if that fixes all my problems