How to diagnose a bad fuel line on a CP3?
The way to diagnose a bad cp3 is to run 2feet of clear fuel line from the OUTLET port on the CP3 (you can get to it with just removing the A/C compressor and a needle nose pliers) to the oem return hose. Its like splicing in 2ft of clear fuel hose, the return fuel (unused from cp3) should have NO BUBBLES.
Can a FPR failure cause a CP3 failure?
Well usually the FPR will lope the idle of the truck or make it idle rough. The CP3 wont. The rough/lope idle is caused by excessively high rail pressure at idle, if the CP3 is worn out there is NO way it would cause HIGH rail pressure, it will only come up short of commanded.
How can I Check my injector fuel return?
There is no sensor to monitor returning fuel flow so any checking of injector fuel return rates must be done manually by tapping into the fuel return fittings on the top of each injector. This can be done at home if you just use a little ingenuity to set up your own test rig. Im Superrrrr!
When to replace the fuel pressure relief valve?
Crank the engine for 15 seconds while observing the fuel pressure relief valve on the junction block for fuel leakage. • If fuel is leaking from the fuel pressure relief valve, replace the fuel pressure relief valve. Refer to Fuel Pressure Relief Valve Replacement .
Where are the injector return lines on a LB7?
Injector return lines are under the valve cover on LB7 engines. Pressurize the return circuit with the valve covers off and look for bubbles or vacuum test the return circuit off of each head, the return should hold 15 inches Hg of vacuum. Oregon Fuel Injection
How does the rail injector in a CP3 pump work?
The fuel pressure regulator or fuel control actuator in the high-pressure pump, controls rail pressure. The injectors have a hollow check ball which holds that rail pressure until the fuel solenoid is actuated by the ECM. This allows the check ball to rise off it’s seat and prompts an injection to take place.
What are the symptoms of a CP3 pump failure?
This is a one-stop symptom checker for issues related to common rail injectors and CP3 pumps. High pressure is built and then delivered by the pump to the fuel rail manifold.
What should my fuel injection rate be in neutral?
Monitor injector balance rates in park or neutral. Injector balance rates outside of +4 to -6.9 indicate a problem with that cylinder or injector. A missing or damaged chamber gasket or low compression could cause a miss. Crankcase overfull (fuel dilution) can cause a rough run and balance rates out of specification.