Anyone know what the pressure the 2.7 low pressure pump runs at? - Page 3 - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand

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Old 03-10-2018
Mountain Man  Mountain Man is offline
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OK, thank you all for coming back to me, much appreciated. Below is the report that came back from the mechanics.

Fit Replacement Battery.
Repair and Re end battery cable connections to battery.
Replace failed starter motor assembly.
Remove seized cylinder 4 injector and dicarbon head and retaining bolt hole.
Perform engine diagnostic computer scan to test fuel system pressure and detect electrical faults, no electrical faults detected.
ITEMS REQUIRING ATTENTION.
Fuel injection pump assembly needs replacing (Low Fuel Pressure). Specifications have desired fuel pressure at 36000 KPA. Fuel pump is only delivering 182-728 KPA.

Well, that is the report but in the early hours this morning I woke up thinking about it all, (it has possessed me) and would it be the high pressure pump that is the problem as in the report they do say that diagnostic testing indicates a bad pump but, would the low pressure pump produce 182-728 KPA? Now, one thing that may or may not be important, when I replaced the o rings in the high pressure pump, I replaced everything except the part where you have to remove that tiny cir clip and pull the front of the pump out, so basically I have not even looked at that part. I will pull it of today and finish the task. Also, how would I be able to tell if the pump is cactus? I do remember that the pistons under each head had some like sort of rusty marks, probably not rust but more scoring if you know what I mean.

Rob
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Old 03-10-2018
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Forgot to add, the battery is not a week old as yet and I have had it on the charger to make certain it is up there, so the battery is all good.
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Old 03-10-2018
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Okay - ignore my ramblings about voltage.

I think you have misunderstood your mechanic's report. I read it as saying your HP pump is only producing 182-728 kPa when it should be 36,000kPa (which is 360 bar which sounds about right). If so, then it will never fire at 728kPa (7.28 bar). It's not even close to enough.

If the pump is three-quarters dead, it is possible that when the engine kicks on start-ya-bastard (wich is effectively throwing fuel directly into the intake) it has enough speed to get the pressure above 250 bar which will allow theengine to fire up and run. As I said before, get yourself set up with the software and check the pressures yourself. The real test will be to give it a boot-full and see how the HP pump keeps up.

In fact, if the HP pump is almost dead, the engine might even stall at full noise. Have you tried it?
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Old 03-10-2018
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JeanLuke,
Actually I did try it and when I gave it a foot full it stalled.
Rob
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Actually, if anyone has a pump that they know is in good condition , i'm keen to buy.
Rob
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Old 03-10-2018
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Quote:
I replaced everything except the part where you have to remove that tiny cir clip and pull the front of the pump out,
Be careful when you remove the tiny cir-clip, there is a tiny check ball behind it.
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Rock Auto have them. Look under 2003 Dodge Sprinter.
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Actually, thinking about this - don't spend money on a new HP pump just yet...

How far have you driven since you played with the fuel system?

Get it started and go for a good drive - around 15-20km. As you get back near home, try full-throttle again an see what happens (be prepared for it to stall again, so think about your situation before doing it an make sure you have the SYB with you).

My thinking...
More than once when I have opened up te LP side of the fuel system, I have thought I had all the air out. However, if I gave it a boot-full just down the road it would stall. Obviously it takes time to bleed out. It comes good after a bit of a drive.
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Well folks, I think I have found the problem.
The fuel line that goes to the front of the high pressure pump has a split in it. It looks like a ware mark that probably started as a tiny pin hole type and today just got bigger because it was spraying a shit load of diesel out.
It appears to have been rubbing against the engine for some time.
Now, I don't suppose anybody has a fuel line for sale? Or is there a way that I can maybe cut the line in half and put a joiner in.
Thanks,
Rob
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