8 letters - "a valve controlling the flow of fluid, especially fuel, to an engine"?

I'd appreciate some help

Answers:
It's THROTTLE.

noun: a valve that regulates the supply of fuel to the engine

http://www.dictionary.com/
fuel injector? I'm not sure.
inchpipe
THROTTLE is the word, but speaking as a mechanic, the definition you state isn't exactly accurate. The throttle plate in the carburator controls the amount of air flow through the venturi where the fuel is mixed with air, also known as the throat of the carburator. The amount of air flowing through the venturi controls the pressure which is what draws fuel into the airstream. The further open the throttle plate, the more air flows through the venturi and the lower the pressure in the throat of the venturi, the lower the pressure in the venturi, the more fuel flows. So, in a crude sense, the throttle plate does control fuel flow, but only indirectly, not in the direct sense of a water faucet controlling water flow in a sink through a variable restriction.
Fuelpump
carburetter
throttle. This is the answer to a question in one of the £1000 Express crosswords.
Throttle.
However the person writing the clue doesn't know much about engines, as a throttle generally controls the air flow, not the fuel flow.
METERING VALVE. It is part of the carborator that regulates the flow of fuel into the venturi of the carborator.
the throttle is connected to the butterfly valve the butterfly valve is connected to the carburettor the carburettor is connected to the fuel inlet and that's what controls the go go juice. try try try but i cant seem to make it fit the tune
throttle

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