Help needed servicing the fuel filter / regulator on a LP5000S Countach | FerrariChat

Help needed servicing the fuel filter / regulator on a LP5000S Countach

Discussion in 'LamborghiniChat.com' started by Redlambo, Jan 9, 2023.

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  1. Redlambo

    Redlambo Formula 3
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    #1 Redlambo, Jan 9, 2023
    If anyone has any knowledge on servicing the fuel filter regulator on a 1984 LP5000S Countach, I would appreciate any advice on what to remove other than the entire powertrain to gain access. I have a leak from the filter bowl and need to fix it.

    From my evaluation so far it appears that if I remove the one metal coolant pipe running on top and parallel to the air filter box along with possibly the fuel lines on the left side of the engine along with possibly the metal tube / hose for the vacuum canister I might just be able to access it in order to try and tighten the screw under the bowl. If that fails I guess the next step is removing the air filter box and possibly the rear carburetor.
     
  2. raymondQV

    raymondQV F1 Rookie

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    #2 raymondQV, Jan 9, 2023
    Vic,
    the fuel pressure regulator is directly behind the drivers head. It should be accessable to service, but yes it's not at all easy to access.
    Perhaps these pictures help: Lamborghini Countach LP500s DLA12662
     
  3. EarlyCat

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    #3 EarlyCat, Jan 9, 2023
    I would remove the wing/trunk first. Takes about 5 minutes. Then the drivers side air cleaner lid, then carb trumpets & then the air cleaner. Use an old pillow or cushion to lay on top of the engine. Access will still be tight, but I would try that before draining the coolant & removing the pipe.
     
  4. Redlambo

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    #4 Redlambo, Jan 9, 2023
    Thanks Raymond.
    Yes I know where it is as I can see it leaking from the bottom of the bowl.
    It is the accessibility part that is the problem.
    Everything is in the way.
     
  5. Redlambo

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    #5 Redlambo, Jan 9, 2023
    Thanks EarlyCat.
    Trunk and deck lid is already off as this is the first step for any significant work to be done on the engine and yes, step two is moving blankets over the top of the engine, then a step stool to climb into the trunk.
    I am very tempted to remove the left coolant pipe as the radiator fluid has already been drained.
    It is only three hose clamps and its out of there. Worst case scenario it will make removal of the air boxes easier if I still cannot access the bottom of the fuel bowl.
     
  6. EarlyCat

    EarlyCat Moderator
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    #6 EarlyCat, Jan 9, 2023
    Sure if you have it drained then no problem removing the pipe.
     
  7. sp1der

    sp1der F1 Rookie

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    #7 sp1der, Jan 9, 2023
    Yep remove that coolant pipe and air-cleaner box and then you can access, it should be a small malpassi filter/regulator.
     
  8. Redlambo

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    #8 Redlambo, Jan 10, 2023
    Thanks Simon.

    I will keep everyone posted on my slow progress.
     
  9. Redlambo

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    #9 Redlambo, Jan 14, 2023
  10. raymondQV

    raymondQV F1 Rookie

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    #10 raymondQV, Jan 14, 2023
    I wonder whether it could have been easier to remove the coolant expansion bottle only
     
  11. islerodreaming

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    #11 islerodreaming, Jan 14, 2023
    One of those situations where you wish you had the hands of a six year old..
     
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  12. Rapallo

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    #12 Rapallo, Jan 14, 2023
    This is a terrible design, you should use this opportunity to change/simpleyfie the layout. extend/replace fuel lines,mount filter in an accesible spot.
     
  13. raymondQV

    raymondQV F1 Rookie

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    #13 raymondQV, Jan 15, 2023
    Absolutely, the factory design is not the best, see what I did when we replaced the head gasket.
    Imagine, they made the Y to connect the two fuellines coming from the pumps inside the engine bay near the headers, I made the Y just at the fuel pumps and lined the fuel line between the tank and the firewall directly up to the filter, nothing inside the hot engine bay anymore. That's how they should have done from the beginning!
    Lamborghini Countach #GLA12997 Head Gasket Fix
     
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  14. sp1der

    sp1der F1 Rookie

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    #14 sp1der, Jan 15, 2023
    Personally as your this far in, just unbolt the filter - from memory its 2 m6 bolts and then take the thing out as you can check what is really wrong, sometimes the gasket can go bad between the top part and the bowl. Its little more work and you can change the filter easily at the same time.
     
  15. Redlambo

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    #15 Redlambo, Jan 15, 2023
    Raymond, that is what I initially started to do.
    I took all three bolts out and tried to remove the expansion tank and it was giving me a hard time.
    After a bit of trying to get it out I realized that it would not help me that much and determined it would be best to simply remove the coolant tube and air box.
     
  16. Redlambo

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    #16 Redlambo, Jan 15, 2023
    That is what I am thinking.

    Thank you
     
  17. Redlambo

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    #17 Redlambo, Jan 15, 2023
    Nils, the problem is that there are few places to do this on a side draft Countach.
    On Raymond's down draft Countach there was more room to work with moving things around a little bit.
     
  18. Rapallo

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    #18 Rapallo, Jan 15, 2023
    good point
     
  19. Redlambo

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    #19 Redlambo, Jan 15, 2023
  20. Redlambo

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    #20 Redlambo, Jan 15, 2023
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  21. raymondQV

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    #21 raymondQV, Jan 15, 2023
    Definitely a good time to entirely service the unit, also to replace the fuel lines if not done.
     
  22. Redlambo

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    #22 Redlambo, Jan 16, 2023
    Everything will be serviced and replaced properly as I do not want to do this again anytime soon.
     
  23. sp1der

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    #23 sp1der, Jan 16, 2023
    Had an idea and might try it on my car, just add some female to female turnbuckles (with studs added on one end) to the current studs and then fasten the unit to these as it will be higher up and easier to access. Its a bolt on fix and can be removed leaving the car as originally intended.
     
  24. Redlambo

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    #24 Redlambo, Jan 16, 2023
    Be very careful as you might be right on top of the positive terminal block assembly.
     
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  25. Redlambo

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    #25 Redlambo, Jan 28, 2023
    Well I rebuilt the filter / regulator and the replacement regulator diaphragm was slightly different.
    The original one had a nipple that located the spring and the new one does not and it raises the spring approximately 1/8"
    When I checked the pressure it read 7 psi, which I believe is to high.
    I tried to adjust it down to 3.5 psi however I ran the adjustment screw came out.
    Does anyone know what the idea fuel pressure setting is?
     
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