Reply With Quoteput some line on the injector lines and see what comes out of them, most likely you have a leaking injector.
Wizard
Just wanted to confirm that i have this right, before i go rebuilding a fuel pump for no good reason.
So i have finally gotten round to looking at the disco after limping home from the Vic Long weekend at Wombat trip. My work has me travelling a bit lately
The vehicle is a 97 Disco TDI
The problem is that i have been getting air into the fuel system.
I have gone through the fuel system with some clear tubing trying to find where the fuel was getting in. Starting at the filter and working back one section at a time, i noticed there was a small ammount of air in the fuel but it did not get any better or worse the further back i went, till i got to the sender and bypassed it using some spare fuel line shoved to the bottom of the tank. Nothing unusual there untill i looked at the return fuel. the return fuel has a massive ammount of air in it. to the point where it is milky in colour. putting the clear line at the beginning of the return line confirms the same ammount of air there, so it is definitely at or before the main pump.
So i guess that explains why i have not been able to find an air leak in the pickup system. But how is air getting into the return fuel? my understanding is firstly that air shouldnt be there and that it could be coming from 2 possible sources, an injector or the main pump. cracking the banjo bolts at the injectors and the return on the main pump i cannot see where the air is coming from. i did check the fuel stop solenoid to see if that was the culprit, no luck there, and ran out of time before severing the return from the injectors to the pump and putting the clear line there.
So before i have another shot at narrowing this thing down, am i right in thinking the 2 likely causes of the air in the return line are as above? and if it comes to it is there/where do i get a "seal kit" for the injection pump?
Either way, it looks like the disco will be off the road for a little while longer.
RoverLord
put some line on the injector lines and see what comes out of them, most likely you have a leaking injector.
Dave
"In a Landrover the other vehicle is your crumple zone."
For spelling call Rogets, for mechanicing call me.
Fozzy, 2.25D SIII Ex DCA Ute
TdiautoManual d1 (gave it to the Mupion)
Archaeoptersix 1990 6x6 dual cab(This things staying)
If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
If you think you're in front on the deal, pay it forwards.
Wizard
Thanks,
Hopefully get into it tomorrow arvy.
Is there any way i can get the injector lines off without cutting them?
Wizard
Return fuel does/can look aerated. This shouldn't have an effect on the engine.
Wizard
DO NOT CUT, injector lines are usually expensive to replace. Undo nut from injector and it's clamps along the line, slip the nut back and slide your hose over the line.
Wizard
Can you tell us why you believe you have air in the fuel system.
What are your symptoms? What is the engine doing or not doing.
Wizard
i had to limp home from a trip because during the trip it started running really rough and wouldnt rev above 2000. for some reason that went away and i limped home with the engine is down on power (85% approx available), and surges under acceleration. (all filters checked/replaced, wastegate is functioning and air pipes are ok)
it has air in the puckup, confirmed by bleeding the system at the fuel filter, then starting the engine and the air is back, so i whent through the pickup with some clear pipe, and could see the air through the pipe. this is when i noticed the return fuel.
I had same issue in my 97 TDi disco, it turned out to be a pin ***** hole in the main fuel line just before the injector pump, was only a little damp in the general area, it had been touching another line in general area, about 100mm to the rear of injector pump.
ForumSage
I have had strife with the copper washers on the banjo bolt going hard and not sealing, this was the cause of air getting into my injector pump producing the same symptoms as you have described.
To soften these copper washers, they need to be annealed and to do this heat the copper until cherry red and drop immediately into water so to cool quickly.
If the lines have cracked or rubbed through, a bit of compressed air blowing the diesel back down the lines can show up a leak. You will need someone to operate the air while you look, good luck with that!
.
RoverLord
thats symptomatic of the fuel lift pump warning you its on the way out.
to check it easily, cut the fuel line from the lift pump to the injector pump and put in one of the clear cheap $3 fuel filters from supercheap or the like.
If you have air in this then you have air coming in from upstream of the lift pump outlet.
the most likely suspects for this are (in no particular order)
a chafed fuel line
a damaged seal on the fuel water seperator
a damaged seal on the main fuel filter
Snot contamination of the pick up or the fuel water seperator.
Dave
"In a Landrover the other vehicle is your crumple zone."
For spelling call Rogets, for mechanicing call me.
Fozzy, 2.25D SIII Ex DCA Ute
TdiautoManual d1 (gave it to the Mupion)
Archaeoptersix 1990 6x6 dual cab(This things staying)
If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
If you think you're in front on the deal, pay it forwards.
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