1995 Jeep Grand Cherokee Logo
Posted on Jan 07, 2009
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2001 grand cherokee laredo 3.1 diesel would not start

Injection pump and injectors checked cleaned, calibrated by specialist diesel service centre. I do not have the timing specs to check the installation of the pump. The cranks but would not start.

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  • Anonymous May 11, 2010

    hi from uk have read bcally1 reply and he mentioned the engine you have is cummins ? not familiar with your model however here in uk the cummins engines i have worked on are on hgv trucks and i am conversant with fual systems not sure if this is related to car cummins engines but the fuel injectors are under the rocker covers and are rocker operated there for req periodic re torque just like tappets the torque is in inch pounds andif left for too long power falls and poor starting due to injectors not atomising correctly so if new injectors and seals fitted ? make sure the injectors were re torqued as to each cylinder firing order and reset tappets at same time all above as i have said is the cummins engines here in uk trucks and not sure if same fuel system pump/injectors are same in the vehicle you have ?

  • Anonymous May 11, 2010

    one other thing... make sure your battery if fully charged and the engine is turning fast enough... diesels don't like to start if turned too slowly!

  • Anonymous May 11, 2010

    If a specialist went over it already, was it running when they did that? If not, why did they "abandon" the job?? How was it running before this happened?
    If you want to "play" with fuel timing yourself, make sure you mark where everything was so you can return to that point if need be.

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  • Posted on Jan 08, 2009
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It could be that one of the injectors is bleeding off pressure not allowing enough fuel pressure to start. the 5.9 and 6.7 cummins need at least 2000 psi to start

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  • Posted on Jan 08, 2009
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Before removal of the fuel injection pump, I am assuming that u checked to see which fuel line was for which cylinder on the fuel injection pump. Well if this was done, place ur #1 cylinder on compression and at the sametime spill time ur fuel injection pump so that #1 will be the next outlet to dis-charge fuel. After this is done, insert the fuel injectrion pump, and ur job is now complete. IF ur front cover is off, there are usually markings on the gear of the fuel injection pump in order for the markings to be alligned

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are you on wrong forum, Grand cherokee is it?
the XJ jeep is not a ZJ jeep. which is it, the big GRAND ZJ?
what a great question, actually cars with EFI all have 3 filters...
sorry to shock you.

1: the fuel sock , below the pump , to catch loose golf balls. LOL.
dead bugs, etc.
2: the pump output line has a filter., all do, can be in tank (newer cars) or just outside (did you look first or post first) bingo!
3: then each injector has 10 micron size screens. the above keeps these clean, saving $120 for injector service and labor R&R.

and what engine, not posted engine size on engine questions
the fuel system matches ENGINE type, on all cars made.
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ive owned both a grand laredo and not grand laredo 1988 to 2010

if not grand see this XJ car.
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http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service


the grand is called a ZJ
also on same page and both are LAREDO's

the book has a fuel chapter.
read that. for free.
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Need the timing marks for a 3.1 td 5 cyl diesel injection pump

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I have a 2000 Triton 2.8 diesel mk 4wd regularly serviced that blows black smoke constantly under power & uses excessive fuel

does your regular service includes the injection pump being brought down for cleaning and maintenance?

it is an injection pump problem. inside the injection pump are valves and strainers that are not accessible for regular users. they could only be cleaned or replaced by these people who work with injection pumps and they would calibrate the injectors also so that it would not be blowing black gas and uses excessive fuel.

tnx 4 using fixya,

drcool

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