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oil leak in the engine bay, trying to locate it.
Topic Started: Mar 14 2017, 06:41 PM (1,626 Views)
ivecojoe
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From what you say its still lift pump causing problems, firstly have you had the sender and pipes out of the tank,why I ask is because you should have a strainer/filter on the bottom where it picks up the fuel..could be blocked, from there on iveco s you have a micro filter in line just after the tank ,check if you have one.
Ok so you have done this and clean fuel up to lift pump, can you temporarily fit a 12v electric lift pump where your mech one should be, you could leave mech one in place and just bodge,sorry I meam make a temp one using extra pipes connected in the line, this will confirm its pump fault or otherwise, it might be a little faffing around but proves where fault is/isnt.
Keep your spirits up Ned,its a minor set back.Iveco Joe aka Arther dailey aka .....ha.
ps to get original pipes of fittings warm with hot air gun........gently!
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Ned
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will try that Arthur cheers. I didnt have the lines out oif the tank but - all the moving around caused the diesel filter to leak,
so I took off the line there (red line below). I crimped the line with a vice grips trying to avoid air getting in, but that was impossible.

So there is air somewhere between the fuel filter and the engine i think.


Posted Image

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mark hadley
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In many respects it looks like my engine. Note that I can put in a new fuel filter and still start the engine and just about keep it running until the air is flushed out of the whole system.

is there a small flexible hose between the fuel filter and the main fuel pump. I don't recognize that. Could it be collapsing from the suction?
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Ned
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had a look Mark but the hoses arent deformed, good suggestion though.

I took off the top cover and opened the nut on cylinder 1 and 3, then turned the engine over and i could see bubbles, so there is deff air in there. That fixed it for a while but it started happening again later in the evening, so i reckon ill give it another go.
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ivecojoe
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Sounds like you need to fix the leak by the filter first as any air sucked in will stop it.Joe
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Ned
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I took it off and cleaned the seal a few weeks back Arthur. Its not leaking fluid anymore, so probably that means no air is getting in?

I think there is still air trapped in there though. Ill try work it out by loosening the injectors again.
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mark hadley
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I don't understand the need to bleed the fuel system. it's possible to replace the fuel filter with a new one, full of air obviously. The engine then runs and sorts itself out after no more than a momentary stutter.
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Ned
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Hmmmmmm



its a puzzle indeed. When I bled the injectors it sprung to life immediately, so it liked that. But it only worked temporarily.

edit, did a bit of reading and i reckon its the lift pump. It was the cause of the massive oil leak in the engine bay, i replaced the o-ring, but there is still a slight leak from it, so probably its letting in air.

Posted Image


I'll get a new one, they arent expensive on ebay.



Edited by Ned, May 31 2017, 12:22 PM.
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mark hadley
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try this then. The lift pump goes from tank to filter I believe. then the main pump draws from the filter to the injectors.
So prime it ready to start. Start the engine, wait for it to stop then seem if the fuel filter housing is full of air or fuel. if you think the lift pump is letting air into the system then the fuel filter will be dry of fuel.

How about the return line from the main pump back to the tank, through the sender and into the tank. it's designed to be free flowing, I don't know how the main fuel pump would work if there was always back pressure.

In answer to you earlier question it is possible to have a leak that lets air in but is fuel tight, and viceversa. Because the pressure are quite different.
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ivecojoe
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For some reason I thought you already re newed the lift pump !!!! as your picture showed what I thought was a new one beside its box?
anyways yes classic lift pump symtms as I think I said before, fergie tractors get the same fault,few years back now on my mk2 I was really busy,phoned the main dealer and asked them to send a mech out with new lift pump,he turned up ,reckoned it was the starter so spent couple hours changing it out,guess what..yup wouldnt start,changed lift pump,fine.
He phoned his boss as I refused the bill for the starter, poor sod ....
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Ned
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naw that was a pic i grabbed off the net Joe.

Mark this is how the fuel line is routed. Does you method still work with this setup?

Posted Image
Edited by Ned, May 31 2017, 06:44 PM.
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mark hadley
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That's what I thought, but go with Joe's advice...
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graysworld
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Lift pump is an obvious one as it is not new. I had a small pin hole in one of my rubber hoses once. As Mark says no fuel leak but air sucked in no problem. If you haven't already try replacing all rubber hoses. I always carry a spare metre or so as they are very short lasting!

Good luck

Graeme
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Ned
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Graeme do you recall what the diameter of the rubber hoses is? sounds like a valid idea.
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graysworld
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Hi Ned,

Hose is 3/8" or 10mm

http://www.ebay.co.uk/itm/SAE-J30-R6-Fuel-Hose-Diesel-Oil-leaded-and-unleaded-petrol-3-8-I-D-/161065481319?var=&hash=item2580403467


Graeme
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