The Mitsubishi Pajero Owners Club®

Fisher-Price · Posted: Mon Mar 25, 2019 13:00 Post subject:

...determined not to give up on her, though it is getting rather frustrating!

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Fisher-Price · Posted: Mon Mar 25, 2019 20:34 Post subject:

Just had a thought, if anyone with superior mechanical knowledge than me can advise.
I previously replaced the fuel lines, from tank to inlet on lift pump, return from pump to tank and the shorter outlet from lift pump to injector pump, however, I hadn't realised until removing the intercooler that there is a further short one, it goes from the banjo bolt fitting on back of pump to the injector rail and looks a little worse for wear.
If this pipe was perished and porous could it inhibit fuel pressure and thus prevent my truck from starting? I'm guessing not, as it's probably part of the return.
Apologies if that's a totally ridiculous question, clutching at straws...I'm no mechanic, I just like to have a go where possible!

Simonfathead · Posted: Mon Mar 25, 2019 20:46 Post subject:

If your getting air in the fuel system through a perished hose that could result in a non start, have you bled the fuel system recently to see if there is a lot of air in the system? You probably have but thought it may help i know how something that doesn't work can get very frustrating very quickly!

Fisher-Price · Posted: Mon Mar 25, 2019 21:14 Post subject:

Hi Simon, thanks for the reply.
I have indeed bled the system at the lift pump on several occasions, get bubbles initially then solid fuel. It most definitely gets frustrating, not gonna let it beat me though, it was my fault in the first place for leaving her stood so long!

trekker · Posted: Tue Mar 26, 2019 12:22 Post subject:

Re-read your initial and subsequent posts last night. Many elimination tests have reduced the possible causes of the engine failing to run. The diesel engine needs correctly fed fuel, timing of valves, preheat and compression to fire and run, and of course air.

Your post mentioned black soot popping from the tail pipe. Black soot indicates burned diesel fuel so I suggested a restriction in the air intake initially, so now suggest a quick test to settle the air supply question. Slack off the manifold end hose clip at the hose between the intercooler and inlet manifold, pull the hose off at the manifold end and tuck it to one side. Don't allow and rubbish to fall into the manifold, and try to start the engine (as you have many times).

Confirm you have previously slackened off the fuel lines at the injectors, and diesel squirts from all 4 as you crank the engine ?

Fisher-Price · Posted: Tue Mar 26, 2019 16:24 Post subject:

Did as you said with regards to hose to manifold trekker and no difference.
I can confirm that I have cracked off each of the pipes to the injectors one at a time and seen what I'd describe as a pulsing squirt from each, not convinced it's enough but as I say, I'm no expert.
I have actually managed to start her today on several occasions for up to a minute or so at a time, then she dies.
I have accomplished this by firstly priming at the lift pump with the bleed screw open, then closing the bleed screw and continuing to pump for a while thereafter. When I stopped pumping after closing the bleed screw she wouldn't start, however, by pumping for maybe a minute or so after closing screw she starts and runs for a short while, then begins to run lumpy before cutting out.
Unorthodox I'm sure but it seems to work briefly and leads me to wonder whether it's a fuel pressure issue?
I'd guess I'm forcing pressure into the system, as the outlet hose from the lift pump becomes pretty hard. Maybe she's running whilst the forced pressure is in the system but cutting out as soon as this drops???
If so, would this suggest a defective pump or maybe a partial blockage somewhere in the pump or between there and the injectors???
I later removed the hose from the primer to the back of the IP and she blew out a jet of fuel with some force, not sure if this would confirm misplaced pressure or not???
Sorry guys and gals, lots of questions and not many answers!!!
Hugely appreciate all the advice.

Fisher-Price · Posted: Tue Mar 26, 2019 21:47 Post subject:

Forgot to add, if I touch the throttle at all whilst she's running she immediately cuts out.
Seems like fuel starvation to me.

trekker · Posted: Wed Mar 27, 2019 10:24 Post subject:

Well I think we can now rule out the alternative causes and settle on a fuel supply to the pump, or the IP being faulty.

Can you go back to running the engine on a container of diesel. if this fuel is clean you can run it without a filter, straight to the IP inlet connection. The pump has a suction impeller, so has the ability to draw fuel from such a set up, if the engine runs and responds well to this arrangement then the issue is air drawn into a number of places from the tank to the filter.

I think you are almost there.

dave

Fisher-Price · Posted: Wed Mar 27, 2019 15:30 Post subject:

Thanks again Dave/trekker.
Great minds think alike, have actually tried bypassing the lift pump this morning, had no joy but batteries drained before I gave it a real good try. Will try again once they are charged, if no joy then I will have to assume it's the IP....ouch! Fingers crossed!!!
Regards, Wayne.

Fisher-Price · Posted: Wed Mar 27, 2019 15:41 Post subject:

One more thing Dave, there's a bunch of plugs and leads in the vicinity of the IP and they appear to be quite heavily soiled in presumably oil. Could a bad contact on any of these cause an IP fault do you know please?

trekker · Posted: Wed Mar 27, 2019 16:43 Post subject:

Had to collect two grandies from school and take them to their swimming coach, hence this late addition.

I'm not familiar with the wiring around the IP, I'll look in my manual this evening.

If the engine won't start even on it's dedicated fuel supply, or even if it does start, I'd add some diesel injector cleaner to that fuel. Given it ran well when parked, the suction pump in the IP could have some of it's sliding vanes stuck in their slides, their fit is precise. Injector cleaner can remove varnish and other residue, true also for the pump pistons.

Fisher-Price · Posted: Wed Mar 27, 2019 18:25 Post subject:

I cannot thank you enough for the continued support Dave, amazing and very much appreciated.

Fisher-Price · Posted: Wed Mar 27, 2019 19:47 Post subject:

Rooting around the IP earlier when I came across this large spade end connector, it's located on the right side of the IP (looking from front of car) and is to the rear and bottom of the pump. Looks like it may have previously had something connected to it but I've had a good look around and doesn't seem to be a plug unattached.
Any ideas anyone?
Tried posting a picture but seemingly unable to do so.

Fisher-Price · Posted: Wed Mar 27, 2019 20:25 Post subject:

Think it may actually be a retaining clip for the big black plug on the nearby harness.

Fisher-Price · Posted: Fri Apr 26, 2019 18:22 Post subject:

Hello all, sorry but I'm back. Got frustrated last time around, so locked her up and walked away for a few weeks. Last weekend I gave her a full valet, as you do when they're not even running! Lol.
Anyway, it's time to start trying to address the non-starting/fueling issue now. Before I go and throw money at injectors and replacing or overhauling the IP, I wondered if it was possible for a faulty lift pump to cause a Pajero to not start? I'm convinced it's a fuel pressure or lack of issue.