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Engine stuttering

Discussion in 'Fuel System & Electrics' started by Ignats, Apr 14, 2019.

  1. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    Still have fuel issues
    As I mentioned in my original post
    Started working through the surgestions all ready put forward but
    Started running rough
    Noticed fuel filter not getting good delivery
    Have all new 6mm lines no kinks from tank
    Have about 4 psi out of pump
    Does the fuel pump draw as well as pump?
    Have included some photos as to the way lines run if there’s anything wrong with the way they are routed
    Cheers
    PS have seen some very nice rigs heading to Mallacoota
    Maybe next year for me
    Just let my spare tyre go with another local bus who’s just got on the road
    Photos coming via another sorce
     
    Mr Beckstar likes this.
  2. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    Photo for previous message
     

    Attached Files:

  3. tintop

    tintop Well-Known Member

    Messages:
    559
    Location:
    Canberra
    it might not help your current problem, but i would get that filter out of the engine compartment...down near the outlet of the tank is safer.
     
  4. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    Not wanting to start a debate but to be honest I think it’s probably safer where it is
    And you’re right that’s not the issue
    Glad to argue the position over a couple of beers anytime
     
  5. tintop

    tintop Well-Known Member

    Messages:
    559
    Location:
    Canberra
    so back to the issue...i have found stuttering on acceleration to usually be
    • lack of sufficient advance eg. vacuum advance not operating (suck on hose and make sure it turns) then follow the drillings through the carby and make sure they are clear and not blocked off by dirt or a gasket
    • blocked accelerator pump on one or both carbies (listen for a squirt of petrol into the throat of the carby as you twist the throttle rod)

    if it bogs down for longer than under acceleration it might be the size of the main jets, dodgy spark plugs eg as already discussed above

    Patrick
     
  6. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    Been working through all of the surgestions regarding timing, sync,etc
    But can’t do anything if not getting enough fuel from tank that’s the issue at hand
    Have blown air back through the fuel line from inlet side of filter
    And have blown from inlet side of pump all good even sucked fuel through from inlet side of pump
    Motor will run until filter is empty then no fuel seems to come in or a trickle at best
     
  7. tintop

    tintop Well-Known Member

    Messages:
    559
    Location:
    Canberra
    oh, i didn't know it was narrowed down to fuel supply - i thought you were getting 4 psi from the pump...are you saying that sometimes you don't get 4 psi (from pump to carbs)?
     
  8. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    No
    Not getting fuel to pump via the set up in photos
     
  9. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    When I checked fuel pressure there was 4.5 psi from pump
    Does the pump draw from tank ?
    Or is it gravity feed?
    I don’t get why I don’t get consistent feed
     
  10. tintop

    tintop Well-Known Member

    Messages:
    559
    Location:
    Canberra
  11. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    Hi Again
    Ok just connected hose from pump outlet had wife wind over pumped fuel into jar at the start then stopped looked over to see filter completely out of fuel
    So why don’t I have consistent fuel flow
    Have included pic of tank outlet
     

    Attached Files:

  12. Kai

    Kai Well-Known Member

    Messages:
    4,741
    Location:
    Sydney, NSW
    pull the hose from the inlet side of the pump and see if the fuel flows clear. have your hose clamp pliers ready. might be faulty pump
     
  13. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    Have done that
    Just done that again
    This might be a really stupid thing to ask but is it possible the 2 tank outlets only one picks up from the bottom of tank because when I blow air into the tank it sounds like the outlet in the tank is just on or near the surface of the fuel
    I put most of a 20 lt jerry can in back when I fueled her up after draining all the old fuel have used a little test running and what not and was getting good flow before when I originally attempted to run engine.
    Going to tip more in tomorrow just to see if it makes a difference
    What do you blokes reckon
    Possible or am I just dreaming
     
  14. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    Yeah but there’s 2 in the photo one forward facing and one back facing
    One drain one outlet I’m thinking is this a reasonable train of thought
    And does anyone have the same outlets on there tank?
    It’s difficult to explain stuff sometimes in writing sorry
     
  15. cbus

    cbus Well-Known Member

    Messages:
    11,932
    Location:
    sunshine coast
    Sorry.checked your photo :)
    Just run off one of the outlets.
    You will need to determine which is the outlet and I'm guessing the other is a return that's only needed on EFI.
    Not all tanks have that setup.
     
  16. cbus

    cbus Well-Known Member

    Messages:
    11,932
    Location:
    sunshine coast
    Replies slow as it's raining today and the mobile tower is slow.
    Only thing more prone to failure than a 1200 cc 6V Kombi is Telstra :rolleyes:

    Block off the unused spigot with clamped hose and plug.
     
  17. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    So the way it is now is correct or is it possible it’s arse about that could be the problem
    Will definitely stick 10 more litres in tomorrow and see what happens if I get flow I’ll switch them around
     
  18. cbus

    cbus Well-Known Member

    Messages:
    11,932
    Location:
    sunshine coast
    Shouldn't be using both spigot as one will be a return and I'm guessing it has a riser that may be sucking air.

    Do a test on each with single hose to check you have flow as Kai suggested.
    The biggest flow will be from lowest " outlet".
    Regardless , you need to establish a good flow without air locks from rises in pipe to prime/feed the pump.

    If you are parked level you have enough fuel already in tank.
    It needs to come from the lowest outlet otherwise you won't be using all available fuel.
     
  19. Ignats

    Ignats Active Member

    Messages:
    110
    Location:
    Merimbula
    That’s why I’m going with 10 more litres and if I get good flow will just swap around
    Only need to get fuel all over we once as that’s always a treat
     
  20. tintop

    tintop Well-Known Member

    Messages:
    559
    Location:
    Canberra
    i think you've found it :)
     

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