ive had a couple of  elec fuel pumps on my tahitti, each one ive tried feels hot after 10 minutes idling in my driveway. ive got the duel tanks. its pumping fine,im just concerned because it feels awfull hot.

BTW, quik electricity lesson here.

As voltage drops, amperage goes up and vise-versa.

If you have signifigant voltage drop (1-2 volts) you would have a 10-20% increase in amperage (approximate), amperage is what generates heat, if a motorized electrical component draws too many amps it will overheat and eventually fail. The easiest way to fight voltage drop is to make as few connections and as short of wire length as possible, and make sure the charging system is up to the task.
 Some (not all) boats use a single wire alternator (Delco) and these tend to "undercharge" when the engine is idleing, especially when using a larger pulley to prevent overspinnig the alt. (not needed under 6000 rpm or so) they basically generate their own "exciter" circuit, which is weakest at idle.

Sorry for the verbal diarreah, but seemed related.

OOOH! almost forgot, Welcome to this disfunctional but very fun place

If your switch is getting warm, it is pulling too many AMPS through it lowering the voltage (the switch and wires are acting like a big resistor) which in turn is making your pump have issues.

A fire waiting to happen in my opinion.

Go buy a relay, and wire it in so the current + wire turns on the relay instead, and the pump gets its power from the battery through the relay.

Hey badcapri!, does your boat have an ammeter or a voltmeter?

If its an ammeter, I would ditch it for a voltmeter, mucho' betta!