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And so the survey data is very unreliable , particularly on the intake side , but even more so , I guess , on the spending side . The important characteristics of a storing system are : great capacity of stock up in small volume ; quick kinetics ( especially in the intake phase ) ; to be safe and stable ; to be able to work at low pressure . In a fuel-injected engine , the right amount of fuel is injected individually into each cylinder either right above the intake valve ( port fuel injection ) or directly into the cylinder ( direct fuel injection ) .