Air in fuel lines (TD5)

[Taun Bewsher]

Hi all,

Been battling since the weekend to get my disco TD5 to start properly. It has been getting progresivelly harder to start, and now wont start at all.

I changed the fuel pump a week ago, and it went fine until friday. Then the problems started. All the symptoms point to fuel pressure or air in the fuel. It would start at first after running the purge cycle, but then even that wasnt enough to get it going.

Checked on fuel delivery at the filter housing, and there was none, so obviously the new pump was faulty. Put in another pump, and it was now pumping at the filter housing, but still wouldn't start, and you can hear air in being pushed through the pipes.

Checked the air bleed valve, and it seems to be working, cant feel air being pushed out, but no diesel leaking either.

Then checked low pressure feed to the filter, and it is a nice solid stream of diesel.

Checked the return from the motor, and its full of air. But before assuming it was injector seals or FPR, I went to check the high pressure outlet at the pump. It is also full of air.

How is the high pressure circuit getting air in it, if the low pressure side is air free?



Sent from my iPhone

[Joe Gordon]

I had a loose injector that caused the same problem. Replaced all the o-rings and washers as a precaution and the problem was solved.air gets pumped into the fuel system from the cylinder and then floods when stopped. easy, Took a month to sort that one out.

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[Taun Bewsher]

Thanks Joe, will keep that in mind. Going to try starting with the fuel filter housing. Im not convinced the air bleed valve is doing what its meant to, reason I dont think its the injector washers is that the problem only started after I change the fuel pump the first time around.

Sent from my iPhone

[Jesse]

Replacing o-rings, take care. Once had to do this on a td5. While installing injector no1, the o-ring moved. Once I started the engine, diesel was forced past the o-ring, the motor did not want to switch of, key out, it was revving up to the limiter, diesel clouds was ………, noise was deafening, a long story but eventually removed the fuel filter and it died down. Be carefull, damn diesels can actually run without the key in the ignition. “Drive V8”

 

 

     Jesse Rowe

Optical Fibre Trends

  +27 82 8521566

  je...@oft.co.za

  www.oft.co.za

[Taun Bewsher]

Problem solved by filling the tank to almost full. Started first time round, just done a test drive and all good. Will see what happens when the fuel level drops below half again.

Now the next part of the problem. After swopping the pump for the second time, the first pump was a total dud, the second pump is from a defender, and now the guage doesnt work? We look at the float/sender unit, and they looked pretty much the same. Is there any reason a defender float unit on a disco will cause the gauge to fail? 

Sent from my iPhone

On 08 Oct 2013, at 12:09 PM, "Jesse" <je...@oft.co.za> wrote:

Replacing o-rings, take care. Once had to do this on a td5. While installing injector no1, the o-ring moved. Once I started the engine, diesel was forced past the o-ring, the motor did not want to switch of, key out, it was revving up to the limiter, diesel clouds was ………, noise was deafening, a long story but eventually removed the fuel filter and it died down. Be carefull, damn diesels can actually run without the key in the ignition. “Drive V8”

 

 

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[Mike Lauterbach]

That is scary.  Could you not have engaged the vehicle into 4th or 5th gear while applying the foot barake?

Cheers
Mike

[Jesse]

I did, but after the initial shock of this thing happening, and yelling to the wife, sitting inside the vehicle, to switch it off, and she showing me the keys, I was confused. I tried the in gear stall thing but totally forgot that the transfer was also in neutral so my gearbox effort was in vain. Imagine my confusion at that point. Suddenly nothing made sense on this b#$%^& td5.

 

Joke for the day.

 

 

     Jesse Rowe

Optical Fibre Trends

  +27 82 8521566

  je...@oft.co.za

  www.oft.co.za

 

From: lroc-te...@googlegroups.com [mailto:lroc-te...@googlegroups.com] On Behalf Of Mike Lauterbach
Sent: 08 October 2013 14:09
To: lroc-te...@googlegroups.com
Subject: Re: [LROC Techtorque] Air in fuel lines (TD5)

 

That is scary.  Could you not have engaged the vehicle into 4th or 5th gear while applying the foot barake?

Cheers
Mike

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[Mike Lauterbach]

Eish, can well imagine the confusion.  Glad it turned out ok