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Latest: March 2008
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Air in a fuel line can cause
numerous problems with diesel engines and is one of the hardest problems to
solve. The best way to determine that air is the cause of the problem is to
hook up a clear hose to the return line. If there are air bubbles coming
through the return line then it is probably getting into the system on the
inlet side.
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Before replacing a leaking
turbo several checks should be made. The oil drain from the turbo should be
checked for restriction, as a bad PCV valve or crankcase pressure build-up can
cause an oil leak. Oil leaking on the intake side of the turbo strongly
suggests presence of an air restriction.
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Injectors can suffer from a drop in opening pressure,
usually after several thousand miles or hours in use. A drop of 200-300 psi is
normal and should not have a noticeable affect on performance. If the pressure
drop is more than 300 psi, the injector should be reset to manufacturers
specifications in order to assure peak engine performance.
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