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can't get '77 mgb to turn over

Last post 10-02-2008, 1:44 AM by fireman91178. 4 replies.
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  •  09-21-2008, 1:25 AM 16357

    can't get '77 mgb to turn over

    Now I can"t seem to get the car started again.  I think it is a problem with the carb. again.  Carb. doesn"t seem to be getting fuel.  If I disconnect the fuel line just before the carb., the fuel flows nice and steady, but if I reconnect it, the fuel will not flow.  I empied out the fuel filter chamber and turned the key for the battery, the fuel pump will not fill the filter chamber unless I pinch open the line just before the filter chamber to let teh air escape, then it will fill up the chamber.  But I still can't get the engine to turn over.  I was thinking that it may also be a vent problem with the fuel line, but I'm not sure where the vent is for it. the books do not seem to be helping me with that one.

    joel

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  •  09-23-2008, 10:11 AM 16383 in reply to 16357

    Re: can't get '77 mgb to turn over

    Hi Joel,

    Havent been following your thread but have you just overhauled the carb or fitted twin carbs??

     It sounds almost as tho the lever arm on the floatSleep is incorrectly set and is shutting off the needle valveSleep  even before theres any gas in the carbSleep. I had this after a recent rebuild of my carbs. A  bit of precision bending is required [ details in Haynes]. If you overdo it tho you get the opposite effect, flooding!!

    Cheers steve

     


    To a man equipped with only a hammer, most problems look like nails
  •  09-24-2008, 3:52 AM 16399 in reply to 16383

    Re: can't get '77 mgb to turn over

    steve,

    thanks for your reply and helpful advice.  the carb has been recenty cleaned and put back together.  I have managed to get my B running at a good idle speed around 800-900 rpm.  it does sound like it is a little slugish still...only running on 2 or 3 cylinders, timing off, carb. adjustment, something.  But i believe it to be the fuel mostly.  I have added fresh fuel to it, but the was some old fuel in the tank that has sat for a few years.  I think there may be sediments in the bottom of the tank as well. 

    my main prob. right now i think is the fuel FLOW issue.  if i diconnect eh fuel line just before the carb. and turn on the battery, the fuel flows at a steady rate without slowing down.  which tells me that my pump is working properly and tha my fuel line is not clogged.  however, if I empty the fuel filter chamber and leave the fuel line disconnected from the carb. and pinch the end off...the fuel filter chamber will not fill.  the pump starts to pump for a few seconds and stops.  Is there any vent line on the fuel pump of fuel line before the carb.?  could my problem be a blocked vent line?  I have not found one in any of my books, but someone had suggested the posibility.  Or do you still think this could be a float issue in the carb.?

    thanks,

    joel

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  •  09-24-2008, 7:34 AM 16405 in reply to 16399

    Re: can't get '77 mgb to turn over

    Joel, see your other thread on this.

    Bayless

     


    Bayless
    Never express yourself more clearly than you can think
    '48 Prefect
    '67 Sprite (project)
  •  10-02-2008, 1:44 AM 16508 in reply to 16405

    Re: can't get '77 mgb to turn over

    update,

    I ended up having to take the autochoke off the carb. and boil the copper spring to set it properly.  after that, I was able to adjust the carb. fine, Got it to Idle between 850-950.  only problem was that the seal on the auto choke tore and I had coolant leaking.  so, I had to replace that and now it has been a couple days and I tried to start the car up, and I can't get it started again!  At least, I can't get it to stay running.  no matter how I adjust any of the adjusting screws.  As I try to start the engine, I can get it to start by raising the air valve about half way, then as it turns over, I"ll accelerate it but not getting any high RPM's.  As soon as I let the air valve down, It bogs down and dies, even with it accelerated. 

    to adjust the carb., I followed the description from in the latest MOSS catalog.  I checked my autochoke again and it seems to be working properly.  I pulled the spark plugs again and cleaned them up.  they are still getting spark. 

     Please help,  what could my problem be?

    thanks,

     joel

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