420/44 DB Owners Club

I don’t fit back there anymore, but my toilet repair guy removed the pump and repaired the pump which turned out to be just the duck bills on the dock!
Would pay to see the video of the contorsions .... or, the trick to doing getting the pump out! I'm not fitting back there so well any more either ...
 
The location is such a PIA that a few years back I rerouted using a couple pieces of 5/8" hose. I ran to a point beneath ladder and then suspended the bracket with zip ties. I sent the return hose back to original location and connected. Kept hose as short as possible and as level as I could. Works very well and makes changing filter a snap. Got the idea from a buddy who had an older 480DB. In his 480, the factory install was just behind the ladder. I simply copied it.
Just had to deal with this a couple weeks ago due to a little overflow problem (check the hose clamps! mine were not tight) and decided to move the filter for serviceability. Now it is just mounted with zip ties to a couple clamps that hold the cockpit fridge condensation line up - it is just starboard of the exhaust tube behind the ladder. Surprisingly, the hardest part was getting the new line connected to the tank - the rubber washer on the tank side connector kept moving out to the end of the connector and I couldn't get enough threads to get it started. Easy enough with two hands but just finger tips was more challenging. Use clear tubing will help ID any future problems if the tank light fails (which it has!). So much easier to service now!
upload_2019-7-29_7-46-7.png
upload_2019-7-29_7-51-18.png
 
You will find a few threads on the subject if you poke around a bit. I tend to cruise slow at 1100 RPM which gives me 9 knots give or take for current and wind. If I want to get there faster then I run 2000 rpm and see closer to 20 kts. We generally only go 20 to 40 miles away from port here in NOR Cal so running slow with the tide works just fine most of the time. I'm running 24X27 props.
 
Thanks, Carpediem. I was poking around late last night and didn't find anything so I thought I would throw it out there.
 
Thanks, Carpediem. I was poking around late last night and didn't find anything so I thought I would throw it out there.
Try pages 49, 51, 53, and 60 in this thread ... various discussions on performance and prop sizing.
 
Fully loaded I’m seeing 20-22 knots at 2200rpm. My WOT IS 2650/2675 fully loaded as well.
 
Mine burns about 7 GPH at 1100 RPM making 9 kts and about 26 GPH at 2000 at 18 to 20 kts. The MPG at 9kts is 1.3 ish and .6ish at 20 on average.
Carpe Diem
 
Here's a few datapoints for mine:
upload_2019-7-31_15-58-50.png


I will be on the boat for a couple weeks starting this Saturday and plan to record a few more throttle/RPM settings. Will report back shortly!
 
I agree with you Alex. The fuel gets stuck in the vent line only when the tank is overfilled. However, sometimes an inexperienced pump operator, or background noise make it difficult to hear when the tanks are nearing full. I usually monitor the fuel gauges at the helm and have them slow down when the gauge says we're close. Usually once a season I'll get overfilled, and then the vent lines will spit drops of fuel for several fill ups going forward.

Let me clarify that during the fill up I use the gauges just to get an idea when I need to pay close attention. For example, if I need 3/4 to fill, I'd engage the start switches couple times to see the fuel level on the gauge. When it gets closer to just under 7/8 of a tank, I head to the nuzzle and release the lock (or whatever was used to hold the pump in open position). The key part is not reduce the pump speed or you will not hear the sound pitch change you're trying to catch. By slowing the pump you automatically change the pitch with slower flow and now your only bet is hear the vent gurgling. I use the same full pump speed and it makes it much easier to hear the pitch change.

I agree that sometimes loud background noise could interfere. In those cases I close one ear and get as close as possible to the nuzzle with another ear. All in all, my biggest noise interference is the STBD side, since quite often my genny is running. But, even with that, you should be able to hear the sound pitch change with no problem.

The only time I found it being very difficult to use this method is by filling up from a truck delivering fuel. Some trucks have very noising nuzzles. In that case, I rely strictly on the gauges and if I take couple gallons less, it's much better than making a mess by spilling. Another trick with noisy truck nuzzles is to use oil pads to block the fuel fill at the nuzzle and listen by the vents. Most of the time you can hear them gurgling as the tanks get close to full.
 
Let me clarify that during the fill up I use the gauges just to get an idea when I need to pay close attention. For example, if I need 3/4 to fill, I'd engage the start switches couple times to see the fuel level on the gauge. When it gets closer to just under 7/8 of a tank, I head to the nuzzle and release the lock (or whatever was used to hold the pump in open position). The key part is not reduce the pump speed or you will not hear the sound pitch change you're trying to catch. By slowing the pump you automatically change the pitch with slower flow and now your only bet is hear the vent gurgling. I use the same full pump speed and it makes it much easier to hear the pitch change.

I agree that sometimes loud background noise could interfere. In those cases I close one ear and get as close as possible to the nuzzle with another ear. All in all, my biggest noise interference is the STBD side, since quite often my genny is running. But, even with that, you should be able to hear the sound pitch change with no problem.

The only time I found it being very difficult to use this method is by filling up from a truck delivering fuel. Some trucks have very noising nuzzles. In that case, I rely strictly on the gauges and if I take couple gallons less, it's much better than making a mess by spilling. Another trick with noisy truck nuzzles is to use oil pads to block the fuel fill at the nuzzle and listen by the vents. Most of the time you can hear them gurgling as the tanks get close to full.
My vent spits easy if you're not careful when listening also. I've taken to just not trying to completely fill most times. I go by the distance since the previous fill. My port side burns a little more than strbd but if I've gone 200 miles I'll just replace it, 100gal strbd/105gal port. If an adjustment is needed because of generator use I'll add that where appropriate.

There are times when I do want to start plumb full, to avoid paying the high prices on Isle Royale is one. Those times I fill completely I compare to my estimate, the difference is a measure of how good of job I've done estimating usage.

I don't have flow meter input, I just know what it's supposed to burn/hr and have an all around mpg number. These things with/compared to gauges themselves help make the estimate. Since I've recognized my tanks don't have to be filled to the brim every time I haven't had any rainbows spreading across the water around my boat.:)
 
Apologies for interrupting this thread, but I was wondering if anyone knows what the ‘G’ in my HIN: USSERP7280G708 means?

I’m assuming the ‘708’ is July 2008?
 
G stands for the 7th month of the year.
The number after it is the year of build.
Last two numbers are model year.
Your boat was built in July of 2007 as a 2008 model.
 
Many Thanks m3s.
 
My vent spits easy if you're not careful when listening also. I've taken to just not trying to completely fill most times. I go by the distance since the previous fill. My port side burns a little more than strbd but if I've gone 200 miles I'll just replace it, 100gal strbd/105gal port. If an adjustment is needed because of generator use I'll add that where appropriate.

There are times when I do want to start plumb full, to avoid paying the high prices on Isle Royale is one. Those times I fill completely I compare to my estimate, the difference is a measure of how good of job I've done estimating usage.

I don't have flow meter input, I just know what it's supposed to burn/hr and have an all around mpg number. These things with/compared to gauges themselves help make the estimate. Since I've recognized my tanks don't have to be filled to the brim every time I haven't had any rainbows spreading across the water around my boat.:)
may have to try just adding back what i think i've burned. Tried to listen and i couldn't tell the difference in sound:(
 

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