Sean Johnson wrote:
>I've another question about the two '79 MGB's I'm transferring a motor
>between:
>
>The car donating it's engine (hereafter referred to as "Fred") has
>dual SU's which I presume came from an older MGB. The fuel line from
>the tank goes thru the filter, and directly to the supply lines for
>the carbs. The carbs also have return lines going back to the tank.
>
>"Barney" is the nearly stock car Fred's engine is going into. Barney
>has what I presume to be a fuel regulator or pulse damper between the
>filter and supply to the carb. Please forgive my ignorance; I'm
>getting a manual ASAP.
>
Sean,
Barney is a 79' B right? If it is stock then the little mechanism
between the fuel filter and the carb is a fuel cut-off valve. I can't
remember where I heard it but I vaguely recall it being explained to me
this way:
Inside the cut-off valve there is a metal ball that is suspended
somehow. If the car is ever subjected to a severe impact or the body is
rolled at an angle significantly greater than flat and level, the metal
ball is dislodged and blocks the path of fuel - effectively cutting off
delivery (thus the name). The valve can be reset by pressing the spring
loaded button on top of the valve. This device was intended as a safety
feature to reduce the risk of fire in the event of an accident and is
in no way necessary for operation.
In case you're wondering - it does work. Sometimes when I jack one
side of the car up real high to do some repair work I have to remember
to reset the valve or the car won't start. Do-it-yourselfers take note!
Let me know if you have other questions. Best of luck.
Dave Hay
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