2.5 N/A in Series 3 Lacks Power

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Rodeo Joe

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I got the series 3 rebuilt, taxed, insured and thought I was going for a run today. As its just been rebuilt I have only had it really running on tickover , when I tried to accelerate it quickly became apparent I wasn't going anywhere.........
If I connect the diesel return from the injection pump and the pipe from the last injector to the fuel filter where they are supposed to go then it will only just tick over at full throttle.
If I connect these 2 pipes to the spill return to the tank (takes the pressure off) then it will run but very sluggish.
Does this sound like an injection pump problem as there seems to be plenty of diesel getting to the pump and loads going to the return?
I'm stumped now and could do with a bit of help.
Cheers
 
Could be fuel pump or the throttle positioon on the pump? Hard to tell. Seems unlikely to be the main part of injection pump as they are quite simple and mostly metal to metal seals but there is a governor that could be connected wrong.
 
Whats confusing me is that when the pipes are in the correct places there is only just enough energy to just about keep it running on full throttle.
When I run the returns straight to a tank it improves enough to get some revs.:confused:
 
Having slept on I am wondering if it could be the non return valve on the pump. When I fitted the engine I had to take it off and replace it, there was nothing inside it that looked like anything was there to make it work, the one I took off another engine didn't either- have they both been messed with?
Has anybody got a picture of the internals of this part so I can see what its supposed to look like.
Cheers
 
The excess diesel in the return is to lubricate the pump internal parts.
Fuel lift pumps are quite cheap so worth replacing if suspect.
Do not have landrover layout at hand for fuel but pretty sure the sherpa 15J is the same note they say there is a non return in the injection pump return line at the pump
 

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  • 2.5 sherpa diesel layout.JPG
    2.5 sherpa diesel layout.JPG
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Rodeo Joe said:
I got the series 3 rebuilt, taxed, insured and thought I was going for a run today. As its just been rebuilt I have only had it really running on tickover , when I tried to accelerate it quickly became apparent I wasn't going anywhere.........
If I connect the diesel return from the injection pump and the pipe from the last injector to the fuel filter where they are supposed to go then it will only just tick over at full throttle.
If I connect these 2 pipes to the spill return to the tank (takes the pressure off) then it will run but very sluggish.
Does this sound like an injection pump problem as there seems to be plenty of diesel getting to the pump and loads going to the return?
I'm stumped now and could do with a bit of help.
Cheers
Click to expand...

Set the tappets, change the lift pump and fuel filter will cost very little, and after that get the injectors tested, before looking for trouble with the IP would be my suggestion.
 
Would they have a similar set up to the TDI, ie- flow and return banjo bolts have different size holes in them.
The flow has a larger hole than the return on a 200tdi, I mixed them up a few years back and had the same issue.
Idled lovely but wouldn't rev.
 
Blackburn said:
Do not have landrover layout at hand for fuel but pretty sure the sherpa 15J is the same note they say there is a non return in the injection pump return line at the pump
Click to expand...
Yes there is a non return valve but its that that i need to know how the internals work as I think my one has missing bits but don't know for sure and at 35 quid for a new one I want to be sure before I get one
 
Yes, but the BOLTS may have different sized flow ports.
On the TDI the bolts look identical and can be fitted in any position BUT the FLOW side of the system has larger ports in the banjo bolts than the RETURN side.
The NAD may not be similar but it's worth whipping the banjo bolts out and comparing port sizes.
 
Ok so the story is this, changed the lift pump now plenty of fuel is getting to the IP
BUT there is none getting to the injectors, took out the solenoid valve and still nothing AT ALL, so the question is this:
Is there anything else that could cause this other than a totally fooked IP?
Would appreciate your thoughts before I dismantle the front end again:(
 
Have you tried disconnecting injector inlet pipes and turning it over, is that how you know no fuel to injectors?
 
I knackered mi two and a quarter none return valve last year. Stripped out the threads to the fuel line retaining nut by over tightening it to cure a seep. Temporarily fitted a push on connector in its place so I could limp it round for a week or so until I could get hold of a new one.

One day I'll get round to finding another. The series hasnt missed a beat while its been off. Over a year now.
 
The plungers that develop the pressure can jam in the up position. People have stripped that part of the pump and freed them, but information is hard to find.
Have you actually had any of the injection pump open?
Can you post a pic of the throttle positions on the injection pump does it compare to the attached pic.
 

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  • What are the adjustments on throttle spindle for.pdf
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I haven't taken anything apart, I have another pump (on an old FX4 engine that land rover made in the 1980'S) that I was going to fit.
Its pretty hard to find any sensible information about this anywhere as nobody seems to know much about it.
I will try and get a pic done later.
 
Rodeo Joe said:
I haven't taken anything apart, I have another pump (on an old FX4 engine that land rover made in the 1980'S) that I was going to fit.
Its pretty hard to find any sensible information about this anywhere as nobody seems to know much about it.
I will try and get a pic done later.
Click to expand...
id take your pump to an injection specialist and check it checked/repaired
 
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