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Jaguar 1960's carburetters

1960's Jaguar carburetters

Have you ever had a flooding carburetters, worse still have you completely replaced the float needles and adjusted the Float Chamber Fuel Level and still had intermittently flooding carburetters. If the answer is yes then read on.

Float Chamber Fuel Level adjustment

The jaguar manual probably reads something like the following:
When the fuel level setting is correct a 7/16"
(1 1. 1 mm.) test bar will just slide between the
lid face and the inside curve of the float lever fork
when the needle valve is in the " shut-off"
position (Fig. 9).

If the float lever fails to conform with this
check figure, it must be carefully bent at the
start of the fork section to correct.

Ensure that, both forks are level and that
the straight portion of the lever is perfectly flat.

Not enough

You think this is all you have to do, wrong! You can have perfectly adjusted carburetters as per the book and still experience intermittent flooding. The cause I found is another adjustment that is not shown in the any of the books. Have a look at the following photographs to illustrate what I mean.

This photograph was taken with the top of the carburetters on it's side, after following the above recommended procedures.
This photograph was taken prodding the fork upwards with very little force!
The real part of the story is told here! Look how you can twist, without any significant force, the fork to make an angular attitude. This is what causes your flooding problem in my opinion. The float is not a perfectly balanced item and this badly adjusted fork can effectively raise the fuel level in the float chamber enough to cause intermittent flooding. The fuel level can also be affected by uphill or downhill attitudes of the car in the presence of this badly adjusted fork.

The cure

The cure is to take a small pair of pointed pliers and adjust the hinge end of the fork to remove any lateral movement in the hinged fork. Simple really! Both myself and Alastair Lauener have had this problem on our 60's S Types!


Some comments by Anders Karlsson I think are a real contribution


If you have had a problem similar to the one described here, I would be glad to hear from you

Contact Alastair Reynolds

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