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brandon peairs 09-23-2009, 04:13 PM anyone know what exactly goes wrong with these things? i have it off and can't see anything wrong with it. heard that they crack but i cant see it! read my other thread to see why im asking(02 lb7 died wont start) thanks JC1843 09-23-2009, 04:28 PM I don't think they "crack"-- but the primer o-rings get worn and the check valves do not seal-- which results in the fuel training back to the tank-- and air enters the system. Also a loose filter/o-ring or leaking primer/WIF sensor will allow air into the system. If there is air in the filter housing, the CP3 will suck air and not fuel, so the truck will take a lot longer to start or in some cases, not start at all. It is important to make sure that there are no leaks in the fuel system. sdreese 09-23-2009, 04:32 PM x2. they are garbage. mine will only stall out in the winter though ericw13 09-23-2009, 04:39 PM if you had a kennedy pump and kept positive pressure there it should not have that problem brandon peairs 09-23-2009, 07:56 PM yeah all orings have been replaced and rubber lines also checked lines going to from tank as someone suggested on my other thread all seem fine but still wont start ericw13 09-23-2009, 09:27 PM when you bleed the filter does the primer ever get hard? if it doesn't then you have a leak somewhere. did you try pressurizing the fuel tank to see if you could find the leak? also the wiring harness is know to cause some problems in these trucks. i would check those as well. keith_2500hd 09-24-2009, 09:12 AM check DIY section, write-up on repairing filter housing. valves, orings, gaskets need attention. Goldhunter66 09-29-2009, 01:52 PM I am currently having this problem with my LLY...posted under Fuel pump/filter truck will not start after replacement...if anyone has any info i will take it...want this truck running tonight! Thank you rafcar 09-29-2009, 02:27 PM I broke the small bleeder screw and the truck would not start. I did not know it was broken until I started to take it off. Replaced that and all was good. waterman7 09-29-2009, 06:24 PM I had hard start issue a while back,took it to the dealer they replaced the fuel filter houseing,,,was told that they get a hole in them that let air in but no fuel out??? It's been about a year now and i havent had any trouble yet,, DougH614 09-29-2009, 09:37 PM Don't bother pressurizing the tank, just replacing the housing with one from dmaxwrenchkit and be done with it. the diapharm gets little cracks in it and suck air, it won't leak anywhere. thats the fix. dollyo11 10-01-2009, 12:33 AM Mine is leaking around the electrical connection on the top/when I prime it//Plastic tube for the connection must be loose/// I have to prime to start and now it has gone from only on the first start of the day to every time I start it// | ||