Bilge Pump Setups

[Red Horse]

I forget the formula exactly but it goes something like this.
A 1 inch diameter hole 1 inch below the water line will flow X GPH
A 1 inch diameter hole 2 inches below the water line will flow 4X GPH than 1 inch below water line.
A 2 inch diameter hole 2 inches below the water line will flow 16X GPH than the the 1 inch hole 1 inch below water line.
Lets say for sake of argument the 1 inch hole inch below flowed 250 GPH
1 inch 1 inch below= 250 GPH
1 inch 2 inches below = 1000 GPH
2 inches 2 inches below = 4000 GPH
Thats alot of water. I will look around for the formula
Bilge pumps are also rated at a higher voltage and 0 head pressure. So if you have a long and high run and your battery is weak take about 15% off your pumps capacity.

[afi823]

im runnin only one 500gph, i wish i had a bigger one though

[jrork]

Thanks guys for the replies. I think you've got me sold on an auto setup to back up my manual 1100 but now I need to decide to float or not.
Part of me likes the old school float setup. Simple & reliable (minus leaves) vs. the new hi tech, leaves be damned (but too damn fancy for me to figure out how they work) technology.
Budlight, is the Waterpuppy a Jabsco?
Decisions decisions....

[malcolm]

I've got a Rule 500 and a float switch wired hot all the time from the rear terminal block. I didn't sweat a drop leaving it in the water at Vern's place all weekend.

[Rexone]

I run (2) 2000 gph pumps with Waterwitch electronic switches w/manual override switches. I prefer them over the float switches. I've always gone a little overkill. I like (2) seperate pumps (regardless of pump size) for the backup factor if one fails for any reason. When you need it there's not alot of time for troubleshooting.

[Wicked Performance Boats]

jrork, Yes it's a jabsco Budlight

[HP350SC]

I run three 500 gph Rule pumps, one in center, and one in each tunnel. Manual switch, all wired in parallel to a relay.

[Ken F]

In my center tunnel I've only got about 1" under the oilpan which is where the lowest point is, right in front of the intake.
Is there a pump made with a remote pick-up which might fit in this area?
Thanks,
Ken F

[Wicked Performance Boats]

You know Ken F, That's a good question! How about an oil pump pickup? It has a screen. Hum, not a bad idea. Budlight

[sanger rat]

Ken, Get a Water Puppy. Run the pick up hose to where you want it. I used a washing machine discharge sock over the end.