bilge pumps & float switches ?

sidelock · #1 09-03-2012, 03:21 PM

I have a 1500 gph manual Rule in my 18 SF that is activated by a rocker switch in the instrument panel & after reading some concerning posts about sinking boats due to pump failure I have decided to install an additional second pump with a float switch or wire a float switch to the existing pump & install a manual pump as a back up.
The existing pump has a 1 1/8" discharge port & hose but the previous owner had it fastened to a 3/4" thru hull with a short piece of 3/4" hose inserted inside the larger hose as a reducer over the 3/4" thru hull barb & fastened with a hose clamp . There is good flow when activated but I don't know whether to leave it as is or go through the trouble of enlarging the hole & replace the existing 3/4" thru hull with a 1 1/8". I would also like some advice/opinion on what size & make pump & float switch to use.

McGillicuddy · #2 09-03-2012, 04:19 PM

Enlarge the hole and change the hose and flange to get your maximum flow. And use quality smoothed walled hose rather than that cheap corrugated stuff they call bilge hose. Personally, I prefer the Rules with the integrated float switches. Some don't like Rule but I have not had one fail. 1200 - 1500 gph should be just fine. Also prefer the Three-way switch with auto/off/manual. Some prefer the self-cycling pumps. I don't.

Here are a couple of good threads on the subject. I'm sure there are many more.

http://www.classicseacraft.com/commu...ilge+flow+test
http://www.classicseacraft.com/commu...ilge+flow+test

sidelock · #3 09-03-2012, 06:51 PM

The existing 1 1/8" hose appears to be auto heater hose, reddish brown in color , smooth walled & in like new condition .I replaced the original on/off switch with a on/off/mometary switch & connected a buzzer to sound when the switch is turned on. I'm kind of hesitant about auto pumps or float switches for fear that they may get stuck in the on position & drain the battery or even worst, get stuck closed & not be able to activate the pump.

Blue197320 · #4 09-03-2012, 07:33 PM

defiently go to a 1 1/8" outlet. i have 2 pumps in both of my boats. 1 1000gph rule on a float with wired to on(float)-off-on(manual) and the 2000 is just on-off for emergency. the same in the other boat only with 2 2000 gph rules.

FishStretcher · #5 09-03-2012, 09:09 PM

I opted for two switches, two pumps, one port, one starboard. I wired mine after the battery switch as it is a trailer queen. If I had a slip or mooring, I would have them direct to battery.

As a side note, I am impressed at how well even a 6 watt solar panel will charge two batteries. Mine was $70 at defender. Which would be nice if I had a slip.

Also someone here told me to stuff the hull with "pool noodles". To help with flotation. I don't think it can hurt if you put plastic fencing between the stringers to keep the pool noodles from pinning a float switch down.

sidelock · #6 09-03-2012, 10:04 PM

[QUOTE=FishStretcher;207271]I opted for two switches,

I'm stuck between a rock & a hard place on this one ! My boat is on a trailer as well but sometimes stays in the water overnight on weekends & that's the reason I thought it would make more sense to add an additional automatic pump as opposed to having two switched manual pumps.

mnwnvc · #7 09-04-2012, 05:31 AM

I have two pumps, a Whale low profile 650 gph with water sensing on off 3/4 inch discharge. It is wired to it's own separate battery. My larger pump is a Rule 11000 gph with a built in float switch and also a manual run switch wired to the motor battery. I did not want the smaller pump to run down my main battery and I like the redundancy. I also have a third pump I can plug into a battery jump box if things go south and I am on board.

mnwnvc · #8 09-04-2012, 05:33 AM

The rule is a 1100 not 11000 gph pump.

FishStretcher · #9 09-04-2012, 09:23 PM

[QUOTE=sidelock;207274]

Quote:

Originally Posted by FishStretcher

I opted for two switches,

I'm stuck between a rock & a hard place on this one ! My boat is on a trailer as well but sometimes stays in the water overnight on weekends & that's the reason I thought it would make more sense to add an additional automatic pump as opposed to having two switched manual pumps.

I do the same. I am pretty sure I have the rule #43 switches, which allow for manual and automatic operation. The float switches are for auto mode. Plus a manual bypass. So I can leave it on overnight on auto, and pump manually if I want. And i have a port system and a starboard system.

Someday I will wire them directly to the different batteries. So If one fails, then if the water gets just a bit higher, the other pump will run.

uncleboo · #10 09-05-2012, 01:05 PM

Quote:

Originally Posted by McGillicuddy

Enlarge the hole and change the hose and flange to get your maximum flow. And use quality smoothed walled hose rather than that cheap corrugated stuff they call bilge hose.

I second the motion. Mine had a thru hull that was 1/2" I.D. and, get this, a 90 degree elbow inside the hull with the corrugated hose!! I put a 1" straight thru hull fitting and upped the hose to the clear smooth 1" hose. With a 1500 gph pump, it empties the bilge in HALF the time! Less battery drain + more water out of the bilge faster = 1 happy guy!