2010 ISX15 Fuel Rail Pressure CODE 559

[RaideRue]

(10-05-2018 )Unilevers Wrote:  do a fuel pump return flow test. Make sure you isolate it - ide be willing to bet the sealing crush washer on the bottom of the barrels didnt crush right and is bypassing.

Building 30K pressure at idle and no load during the test is easy - Its supplying the volume of fuel needed at 30K psi under full load that pumps show strain. either that or when the plungers went they took a few injectors with them.

Uni

how do I go about doing a fuel pump return test? Thanks for your input btw.

I’m starting to think an injector might be bad too. Weird thing is I never had the check engine light last week or ever until I swapped the pump plungers and drove it again.