240sx pump gas to make it start?

[poultry180sx]

93 240sx auto. sometimes i have to pump the gas to start it while i'm cranking it over?? its not all the time. mostly if i have not drove it for more than like 8 hours. or sometimes not at all. i'm guessing its a sensor or something?:confused:

[burnsauto]

could be the coolant temp sensor.