GPH - Gallons per Hour
12 Volt Water Pumps are used for boats, homes, and campers and are considered a Harbor Freight Tool. 12 volt water pumps pump up to 200 gph, and are not to be used with fuel or flammable liquids.
100 gph
13 gph
28 to 32 gph at 500 to 600 hp
3-5 gph depending on the load.
14.5 psi
1.5 to 2.3 GPH as per the John Deere brochure
On the in-tank fuel pump, or pumps if you have two tanks.
Earlier carburated vehicles used external fuel pumps.
Most fuel pumps for fuel injected vehicles will cost more than $100.00, U.S.
If fuel pumps were not necessary, there would not have any on your car! If there is a problem with your fuel pumps, your car will not start, or it will start but it won't run for very long.
My 2007 Volvo uses .5-.6 gph at idle (600 rpm), if I set it for a hi idle (900 rpm) it uses 1-1.1 gph.