How to bleed Injectors
Diesel, bleeding fuel injector
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someday you may run you
engine out of fuel or you may find that
you end up with a plug fuel filter that
will run it out of fuel the bottom line
is you're going to need to bleed air
that may get into the system out of the
fuel system your diesel injection pump
is great at pumping fluids but not air
so we're going to show you how to bleed
the system on this Volvo engine and just
keep in mind that the procedures are
very similar on virtually any diesel
engine so we're going to begin bleeding
the system if you remember back going we
went through the fuel system we pointed
out a little primer pump on this
particular engine I'm going to begin by
priming and it's just to push in and out
on this many engines we'll have a lever
on the bottom of the lift pump what I'm
doing now is trying to force some fuel
up to the fuel injector the line is
cracked and I want to continue to pump
until I get all the air exiting out up
top and I see a good steady stream of
diesel fuel then I'm going to close the
line and seal it off once you get a good
steady stream of fuel pumping out or
leaking out around the top of the
injector immediately close off and
tighten the fitting finish off by wiping
down all the diesel fuel on the outside
of the engine and you're done with that
cylinder now in most cases if you do the
cylinder that's farthest away from the
injection pump the balance of the air
will self bleed from the engine however
sometimes particularly on larger engines
with long high-pressure fuel lines you
may find yourself having to bleed each
injector
or even beginning back at a point on the
fuel filter and cracking lines as you go
through the entire system back towards
the injectors
this will vary widely from one engine to
another generally speaking you can get
it from one bleed point at an injector
