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Fuel Issue

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#16 Tonylamb

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Posted 18 March 2019 - 08:24 AM

All  up and running.  to be honest not sure what the problem was.  fuel was not filling the float chamber.  I didn't find anything stuck in the fuel inlet or any of the jets or needles.  Ran around for half an hour at various speeds, obviously running in so not at big rpm#s.  all running great.  thanks for the help.  Still have the rattle when the clutch is up, which sounds horrible but nothing has broken?  Also need to get the exhaust off of the underside of the car.  there is a horrible drone when decelerating which I think is the exhaust touching the underside of the car.



#17 Tonylamb

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Posted 23 March 2019 - 10:03 AM

So my fuel issue is back. Started car it ran at high rpm for 3 seconds and then died and simply wouldnt start again. pulled the fuel pipe off at the carb put a pot under it and fuel is filling the pot. took the carb off and it seems like the float chamber is empty?? Does the float chamber valve need a certain amount of pressure to open it? I don't think so I think it opens under gravity and is shut by the float? On taking the carb off I held it up the right way and tried to see if the valve was open. Its all brand new so it shouldn't stick. its very frustrating as I cannot find anything obvious. I have a glass fuel presssure filter and regulator, perhaps I should open up the pressure on that a little. Trouble is I don't know when or why this fault is going to occure again. Is there a way to test the valve with the carb off the car apart from visually? any help appreciated

#18 Tonylamb

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Posted 23 March 2019 - 10:04 AM

apologies by the way for asking some of the same questions again.

#19 Tonylamb

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Posted 25 March 2019 - 02:03 PM

So after the second dismantling of the carb it works again.  Drove 50 miles.  adjusted mixture and idle a couple of times.  This time however I didn't plug up the pipe that goes to the crank breather.  Its just resting in the open on the left of the engine.  Is that a problem?  Will it make the engine run lean?  Previously I had the end of the pipe plugged with a bolt but I wondered if that is what is stopping the float chamber from filling correctly.



#20 nicklouse

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Posted 25 March 2019 - 02:07 PM

can we have a picture of this hose? where it attaches to the carb.

 

yes if it or the port on the inlet are open to the atmosphere the setting will always be lean as you are adding unmetered air.



#21 Tonylamb

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Posted 25 March 2019 - 09:59 PM

Here is a picture the blue pipe is the breather the left hand braided the fuel overflow. The braided with red markings is the fuel pipe.

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#22 Tonylamb

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Posted 25 March 2019 - 10:01 PM

I had a bolt in the end of the breather pipe to block it off. But now think that might weaken the mixture. I was worried that it was causing the problem with the carb not filling properly

#23 nicklouse

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Posted 25 March 2019 - 10:19 PM



I had a bolt in the end of the breather pipe to block it off. But now think that might weaken the mixture. I was worried that it was causing the problem with the carb not filling properly

blocking it off is fine or it should be connected to the crank case breathers. it has nothing to do with the fuel side.

 

my main issue is with the point where the dizzy Vac advance would be connected it looks like it has been snapped off and my not have been closed off. inspect the "hole" where the red mark is.

 

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