i bought a 2001 duramax. 260000 miles from a guy. the only way itll start is if you give it a shot of either an then it fires right up and runs great. anyways i know the problem is because when crankin it over the rail pressure is only at 600-700 psi an i need 1500. i didnt know if it was a problem with lines goin to the cp3 so what i did was hooked a line directly to the cp3 and filled it with fuel while holdin it straight up an down. still no start i then took an air compressor and pushed air into the line while crankin it over. this made it start.
i then ordered a new fuel filter housing an replaced all rubber lines and it started for like 10 times without either. (i did have to crank it over a little exta long it seemed like tho) anyways, like after the tenth time of starting it it went back to not starting unless i use either.
i then decided maybe its the cp3. somethin is prolly wrong with it an maybe its having trouble sucking fuel. i replaced it with a new one and finally got it all back together and primed the lines and it fired up. i shut it off and it started back up again. it did seem to crank a lil longer than normal tho. i then drove it around and bout the tenth time i went to start it, it wouldnt start! the fuel rail pressure wont get past 700 psi. i need help!! im using an Edge to monitor the fuel pressure
i then ordered a new fuel filter housing an replaced all rubber lines and it started for like 10 times without either. (i did have to crank it over a little exta long it seemed like tho) anyways, like after the tenth time of starting it it went back to not starting unless i use either.
i then decided maybe its the cp3. somethin is prolly wrong with it an maybe its having trouble sucking fuel. i replaced it with a new one and finally got it all back together and primed the lines and it fired up. i shut it off and it started back up again. it did seem to crank a lil longer than normal tho. i then drove it around and bout the tenth time i went to start it, it wouldnt start! the fuel rail pressure wont get past 700 psi. i need help!! im using an Edge to monitor the fuel pressure