I've been looking for a solid 12v pump for my Zodiac FC470 as long as I've owned it. My wife recently bought this pump made by Coleman. It's called the "Coleman DC 12 Volt Inflate-All Pump". Product description below.
From Coleman's website:
"Quickly inflate or deflate just about any inflatable anywhere with the Coleman® Inflate-All™ with 12 volt car adaptor compressed air pump. Between the two high-volume hoses, you're sure to find the nozzle you need, including sizes for Coleman® Double Lock™ valves, Boston valves, pinch valves, needle valves and Shrader (tire) valves. This compressor is a vital part of any mobile emergency kit. Its 12-volt outlet allows you to power it from a vehicle, and the built-in spotlight illuminates work areas on dark nights.
Fast inflation and deflation for nearly any valve
High-volume flexible hose fits Coleman® Double Lock™ Valves, Boston valves and pinch valves
High-volume retractable hose fits needle valves and Shrader (tire) valves
Powerful pump inflates to 165 PSI
Hinged storage compartment to store high-pressure hose
12-volt plug with 11.6 ft. (2.95 m) cord powers the pump from vehicle outlets
Front spotlight to illuminate work areas at night"
Now, if you're using it for tires or anything else using the standard inflator needle, then you set the digital gauge to the correct inflation pressure.
However, if you're using the high volume connection (which is what you would use for your inflatable) you must monitor the pressure. The digital pressure gauge will not display pressure for this output. BUT, this thing will honestly keep on going until your boat is rock hard. I just inflated my Zodiac FC470 to its maximum pressure in roughly 15 mins. It wasn't empty prior to inflating, but it was low enough to have waves and slight folds in it.
If you're like me, you'd probably also like to have a dependable way to fill your inflatable boat, countless times, that doesn't break the bank. This thing is the answer for only $49.99 MSRP. You can find them on Amazon closer to $30.00.
Consider me stoked!
Here's the amazon link: Amazon.com: Coleman DC 12 Volt Inflate-All Pump: Sports & Outdoors
Here's the coleman link: Coleman - DC 12 Volt Inflate-All Compressed Air Pump