Savana 3500 V8-6.6L DSL Turbo VIN 6 (2007)
Example of Bad Fuel Injection Pump Which Shows more than 3 MPa (435 psi) peak-to-peak fluctuation
Note
The graph reading above is an example of a bad pump.
10. Compare your graph to the examples above to determine if the fuel injection pump is good or bad. The straight line is the desired fuel rail pressure
(1) and the varying line is your actual fuel line pressure (2).
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If less than 3 MPa (435 psi), peak-to-peak pressure fluctuations are observed, refer to normal SI diagnostics.
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If more than 3 MPa (435 psi), peak-to-peak pressure fluctuations are observed or there is evidence that the fuel injection pump cup plug is
missing, replace the fuel injection pump, both common fuel rails, all eight fuel injectors. and flush the fuel system using Steps 11-19.
11. Replace the fuel injection pump assembly. Refer to Fuel Injection Pump Replacement in SI.
12. Replace the left and right fuel injector rails. Refer to Fuel Rail Assembly Replacement in SI.
13. Replace all eight fuel injectors. Refer to Fuel Injector Replacement in SI.
14. Reprogram injector flow rates. Refer to Fuel Injector Flow Rate Programming in SI.
15. Flush all high pressure fuel lines of debris. Refer to Fuel System Cleaning in SI.
16. Replace the fuel filter. Refer to Fuel Filter Replacement in SI.
17. Prime the fuel system. Refer to System Priming in SI.
18. Start the engine and inspect for fuel leaks. Refer to Fuel Leak Diagnosis in SI.
19. Clear any codes and verify that the condition has been corrected.
