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What type of air cleaner assembly do you have?The next time you try to start it up after sitting for a while, before starting look at the carb primaries while moving the throttle arm. If you can see fuel squirting into the carb then the problem is something else.
Yes, the test that Stewart suggests should indicate whether or not you are getting fuel or not after not running it for a week or so. When it does start and run, does it restart easily later the same day?You should get those vacuum connections for the carb sorted out....what year, model, engine size is your truck? Is it a CA truck? Do you have the original air cleaner cover which may help indicate the emissions equip installed? Do you know what model your Q-jet is? Does it have a divorced choke or integral choke? Does it have the idle stop solenoid? A photo of the passenger side of the carb may help identify those hose connections.Regards,Henry
BTW, on a side note, aren't most carbs on lawnmowers gravity fed?