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Common rail system

I need help to know how the common rail in diesel fuel injection work in car

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  • Anonymous Mar 20, 2014

    we are checking injecter pressure at fuel rail and we get 40 psi. is this correct. what is correct psi

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Posted on Aug 04, 2008

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The 2005 Isuzu 4HL1 smoother E engine has no power over hills what could be th problem


loosing compression
fuel delivery

if its the DiD ...internal carbon build up

Jun 30, 2016 | Isuzu Cars & Trucks

1 Answer

WHY DOES MY ISUZU 4HL1 ENGINE HAVE A HARD START ALWAYS?


no car stated, huge NPR truck no less.
no year stated
so no free book information on that engine,.
big diesel. 4HL1, no dash letter?
compression at spec.?
glow plugs work.,
filters clean. water in fuel,
does test fuel (spray'd) help? ???
injection problems
lack of startup air.(filter)


The 4HL1 is a common rail direct injection OHC 16V high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 333 Nm, peak power is 140 PS (103 kW) at 3,000 rpm. Maximum torque is (34.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-N is a common rail direct injection OHC 16V high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 333 Nm, peak power is 131 PS (96 kW) at 3,000 rpm. Maximum Torque is (34.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-TC is a common rail direct injection OHC 16 V turbocharged and intercooled high-pressure fuel injection system engine of 4.777 L capacity with electronic control system. Peak torque is 425 Nm, peak power is 160 PS (118 kW) at 2,700 rpm. Maximum torque is (43.3 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.
The 4HL1-TCS is a common rail direct injection OHC 16 V turbocharged and intercooled high-pressure fuel injection system diesel engine of 4.777 L capacity with electronic control system. Peak torque is 500 Nm, peak power is 179 PS (132 kW) at 2,700 rpm. Maximum torque is (51.0 kg m)'/1,500 rpm. Bore is 115 mm, stroke is 115 mm.

May 31, 2016 | Isuzu Cars & Trucks

1 Answer

There is supply of diesel fuel from the lnjection pump but it seems no diesel going inside the chamber,,


Not enough information. What vehicle? What year? What kind of injection system? There are basically two kinds of diesel injection - injector pump and common rail.
I did notice you talking about an injector pump, but both these systems need a high compression pump to operate the injectors. On the older systems, the injector pump is connected via a gear system to either the crank or the camshaft, and its task is to supply fuel to the injectors in very much the same way as a distributor does on a petrol car.
Now, do you mean the header pump that supplies diesel to the injector pump, or do you mean there is diesel coming out of the injector pump between the pump and the injectors?
On the other system, which I assume you are talking about, diesel is supplied to a high pressure pump which keeps a rail at high pressure. All the injectors are connected to this rail - from there the name "common rail" - and the timing is supplied by the Engine Control Module (ECM) via electrical impulses. Now ,if you have diesel supplied to the common rail but the injectors are not popping, the problem is most likely with the ECM.
However, there is no way of helping you unless you supply more information.

Oct 06, 2014 | Cars & Trucks

1 Answer

My mitsubishi L2 4d56 diesel engine common rail direct injection have not start because there no spraying diesel in the nozzel tip,what is the problem of this?


the injectors arte electronically controlled so check the immobiliser. cam crank position sensors. run fault codes. I nothing shows up have an accredited diesel specialist shop check the pump as there may be a high pressure problem ( pump failure-- common in common rail diesels as they will not tolerate dirty fuel, water and some additives in the fuel)

Aug 16, 2014 | Cars & Trucks

1 Answer

Where is diesel cut off switch located on laguna 1.8


what makes you think there is one.

the FSM (factory service manual) covers this , 100%

buy one new or used.

check fuses first.

why does wiki say there is no Generation II Laguna with 1.8L diesel.

but shows, x6 , 1.9L

all are F9Q-xxx engines. 1,870 cc

so what matters is exactly which of the 6 F9s you have.

all have Direct injection, and works more like gas car than diesel.

but says>

The diesel-fuel is delivered either by a mechanical injection pump or a common rail fuel injection installation.

my guess is common rail.

is it>?

the first job is to check all fuses.

the make sure filters are clean (done)

then make sure the glow plugs all work.

if all that works, then using the proper scan tool see if the PCM

is throwing DTC codes (say for crank or cam sensors)

crank for 5 second scanning. got DTC errors?

if that is ok, fuel pump pressure is key next step.

the next step are the injectors actually firing electrically.



how is that.?

Jul 15, 2014 | 2005 Renault Laguna 1.8

1 Answer

Give me diagram of crdi


crdi (something.) wow and NO YEAR or actual car stated.?
IMPOSSIBLE !

wild guess.
so, what do you need, a drawing of a pipe? what?
the injector number, pins, harness routing, what>
injection what? its in the FSM>
Common Rail Diesel Injection (engine fuel injection system)


Jan 26, 2014 | Toyota Cars & Trucks

1 Answer

I replaced one fuel injection do i need to replace the rest of them


If you are talking petrol fuel injectors-- no . If you are talking diesel and NOT common rail it is advisable to do so, but if you are talking common rail system-- no-- because it will be very expensive and not completely necessary

Apr 01, 2013 | Mazda BT50 Cars & Trucks

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