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Thread: Replace leaking fuel pump. Yikes!!

  1. #11
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    Hey @mudski. I checked the intercooler out and it looks pretty clean and dry. But there was a y slightly oily area on the top of the engine near the injectors underneath the intercooler. I couldnt feel any oily patches on the bottom though. So it could be something else....

    Getting a dyno checkup tomorrow to see if it is actually losing power or just me being paranoid.
    Still to get a second opinion on the fuel pump .....

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  3. #12
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    Quote Originally Posted by neilo99 View Post
    Hey @mudski. I checked the intercooler out and it looks pretty clean and dry. But there was a y slightly oily area on the top of the engine near the injectors underneath the intercooler. I couldnt feel any oily patches on the bottom though. So it could be something else....

    Getting a dyno checkup tomorrow to see if it is actually losing power or just me being paranoid.
    Still to get a second opinion on the fuel pump .....
    I’d be removing the inter cooler and checking the under side. If the cooler is leaking you will be just pissing money in the wind getting dynos etc etc. the cooler only needs a pin hole for it to be rendered useless. I here so many people saying oh it’s just a tiny leak. Well that’s all it needs. It is imperative that you have a 100% sealed intake system from the air box to the inlet manifold.


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    Here is the report from the dyno log. The guy said it looks to be pretty normal, so I may have just been paranoid.
    Can anyone confirm this for me?
    Also, he said the damp patch under the intercooler was insignificant and could not have any effect on it, @mudski. He said it needs to be pissing out to be a concern.
    Dynolog.jpg

  5. #14
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    Quote Originally Posted by neilo99 View Post
    Here is the report from the dyno log. The guy said it looks to be pretty normal, so I may have just been paranoid.
    Can anyone confirm this for me?
    Also, he said the damp patch under the intercooler was insignificant and could not have any effect on it, @mudski. He said it needs to be pissing out to be a concern.
    Dynolog.jpg
    Sorry mate. I disagree.

    Think of it this way. It seems to me you have a minor boost leak. As it stands, your current setup, the boost is automatically controlled via a boost control solenoid which is in turn controlled via the ECU. So. If you have a small boost leak, the ECU will pick this up from the MAP (Manifold Absolute Pressure sensor) on the intercooler, and then tell the the boost control solenoid to increase boost pressure to its factory set level. So say for example, at 80k's at 1/2 throttle in 4th the factory boost is supposed to be at 11 psi. With a 100% sealed intake system. If you have a boost leak, even a slight boost leak, the level may be at say 9psi. So. The ECU see's this and thinks it needs more boost and will tell the solenoid to increase turbo boost pressure. Your turbo will then be working harder unnecessarily.

    A leaking intercooler is not so noticable on a factory setup. And may not matter a whole lot when the leak is slight. Its very noticable on a setup where the factory auto boost control has been converted to full manual boost control. Because the manual boost control cannot automatically adjust and compensate for a boost leak.

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    Hmmm, I think I understand and that makes sense.
    I guess it depends on how bad the leak is, or isnt.
    I am booked into a specialist next week for the fuel leak (which apparently may not need a whole pump replacement), so I will get the to look at the intercooler and turbo as well.

    Thanks @mudski !

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    Doesn't matter how bad the leak is. If its leaking, it needs to be attended too. You would accept it if you bought the car new with a slight boost leak... Just my opinion mate.

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    Quote Originally Posted by mudski View Post
    Doesn't matter how bad the leak is. If its leaking, it needs to be attended too. You would accept it if you bought the car new with a slight boost leak... Just my opinion mate.
    Completely agree!
    3.0 GU Diesel. 2" lift.

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