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Guest
Hi Guys
I had a look at the filter in the fuel yanl yesterday and it was clean. I had never seen in that deep in the tank and it is nice to know that I can do it now. Another little thing completed. Why are there two pipes connected to this thing, ???
Also why are the two pipes different diamaters, if I replaced the pipes all the way forward , that is where they go RIGHT, would that solve the problem if it was a fuel issue..
These two fuel pipes go from the tank straight to the fuel injector pump YES so if these are replaced then it has to be the pump YES. If there is a filter in the pump how do you get at it cause I have heard that the pump is a really specialised job and you should not toutch it.
I will get there if it kills me which it probably will.
John C
92HDJ 80 1HDT Ireland
 
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Guest

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On 9/4/05, John Byrne <[Email address removed]> wrote:
Fuel feed & return =3D two
Because your LC burns fuel, so the amount of fuel returned to the tank
from the injection pump is smaller than the amount of fuel going into
the pump.
em
There are much easier ways of testing fuel pipes than replacing them -
that would be a major job requiring a great deal of dissasembly.
YES
NO - before the fuel injector pump is the fuel filter.
is
There's a small filter in the injection pump, just under the cut-off
solenoid, but as you said, messing with the pump requiires a degree of
understading how things operate.
I'd recommend you take the LC to a diesel specialst to check the pump.
--
Rgds,
Roman (London, UK)
'92 HDJ80
 
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Guest

Guest
Hi John,
Well done, was there any crud in the tank?
The fuel injection system work on a circulatory system - the pump pumps
fuel up the thicker pipe, through the fuel filter and then into the
injection pump where it is distributed at high pressure via a seperate
pump (in the same unit) to the injectors - the surplus fuel that isn't
injected is circulated back into the tank.
Replacing the pipes would only solve an issue if there was an actual
hole in the larger of the two.
Not necessarily, it could be the vent for the tank or even the vent in
the fuel cap - check back to my list and work through the things in
order.
At the back of the pump there is what is know as the Fuel Cut Solenoid
that regulates the flow of fuel to the high pressure injection pump -
it is just above the block where the six high pressure lines leave the
pump and head towards the injectors. If you remove the solenoid you
will find that it is wrapped in a fine filter.
Be very careful when removing it because there is a fine spring in
there and a valve which are easily lost. If there are metal fragments
in the filter it is a sign of wear in the fuel pump which might be the
cause of your problems.
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
1994 HDJ80, 2.5" OME Lift
 
G

Guest

Guest
Hi John,
Well done, was there any crud in the tank?
The fuel injection system work on a circulatory system - the pump pumps
fuel up the thicker pipe, through the fuel filter and then into the
injection pump where it is distributed at high pressure via a seperate
pump (in the same unit) to the injectors - the surplus fuel that isn't
injected is circulated back into the tank.
Replacing the pipes would only solve an issue if there was an actual
hole in the larger of the two.
Not necessarily, it could be the vent for the tank or even the vent in
the fuel cap - check back to my list and work through the things in
order.
At the back of the pump there is what is know as the Fuel Cut Solenoid
that regulates the flow of fuel to the high pressure injection pump -
it is just above the block where the six high pressure lines leave the
pump and head towards the injectors. If you remove the solenoid you
will find that it is wrapped in a fine filter.
Be very careful when removing it because there is a fine spring in
there and a valve which are easily lost. If there are metal fragments
in the filter it is a sign of wear in the fuel pump which might be the
cause of your problems.
--
Regards,
Julian Voelcker
Mobile: 07971 540362
Cirencester, United Kingdom
1994 HDJ80, 2.5" OME Lift
 
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Guest

Guest
Hey Roman
me if I have got it wrong. The fuel pump sucks a lot of fuel to the engine
just incase it needs it and if it doesn't it (the fuel) it returns it to the
tank. Right.
Is this the same in all cars etc or just the LCs see I really dont know.
How do you get the fuel filter off in the engine bay, I have always got Toy
to do it but would like to know now please.
If the problem persists I will get the guys who did the pump the last time
to have a look.
JOhn C
92HDJ 1HDT Ireland
 
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Guest

Guest
On 9/4/05, John Byrne <[Email address removed]> wrote:
ect
e
the
RIGHT. That's how combustion engines work. The high pressure pump taps
into a stream of fuel circulated at low pressure by the lift pump. In
case of the LC's Denso pump, both the high and low pressure pumps are
housed together as one unit.
Other engines have a separate mechanical or electric pump before the
high pressure injection pump. Also, there are two types of lift pumps:
those in or near the fuel tank push fuel along the lines, those in or
close to the injection pump (e.g. 1HD-T) suck fuel from the tank.
oy
Carefully, to avoid damage the filter housing. It's best to undo the
whole assembly (filter and head - two screws) then remove the filter
with a strap wrench.
e
I'd go somewhere else, unless you want to raise a warranty issue with them.
--
Rgds,
Roman (London, UK)
'92 HDJ80
 
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