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  Water in fuel tank - 23 Conquest

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Author Topic:   Water in fuel tank - 23 Conquest
Justcurious posted 03-23-2006 10:16 AM ET (US)   Profile for Justcurious   Send Email to Justcurious  
I have a single engine 23 conquest which does not have the extra lead kit. Because the boat sits bow down, I often have water in the bilge. I'm constantly having a problem with excess water in the fuel which ends up filling the racor filter and then the filter on the engine. This only happens after I have left the dock and started to accelerate the boat. I have had as much as 1 liter to 1 1/2 liters of water in the tank. Is this being caused by condensation? anyone have solutions or same problem.

Thank you for your time.

Marlin posted 03-23-2006 12:12 PM ET (US)     Profile for Marlin  Send Email to Marlin     
I doubt it's condensation. A little back-of-the-napkin math shows that at 20 deg C and 50% relative humidity, you'd need about 100 cubic meters of air to carry a liter of water. That's a cube of air 15 feet on each side. You'd have to work pretty hard to get that much air through your tank, not to mention extract all the water from it.

I'd guess you should be looking for direct water leaks into the tank. A good place to start looking is at the filler cap; if it is missing its O-ring or otherwise isn't sealing, you might get rainwater intrusion. If the external vent lacks a loop in the vent hose, perhaps you have spray entering the tank through the vent. Since I'm not familiar with the particulars of the 23 Conquest fuel system, I don't think I can help you any further.

-Bob

handn posted 03-23-2006 01:13 PM ET (US)     Profile for handn  Send Email to handn     
The other possibility is corrosion of your aluminum tank leading to a pinhole leak due to its constantly sitting in salt water. If you had such a leak, it is likely you would have some gasoline in your bilge.
I had a 23 Conquest with a single 225 and I recomend the ballast kit even though it is pricey.
While the ballast kit doesn't completely end the problem of water sitting in the bilge and corroding the tank, it tilts the boat back enough that the salt water can be pumped out using a manual pump such as a "Thirsty Mate." The kit seems to improve the performance of the boat as well.
BW23 posted 03-23-2006 03:19 PM ET (US)     Profile for BW23  Send Email to BW23     
Contact PERKO and have them send you new O-ring's for the filler cap. This would be the first item to check.

http://perko.com/

rtk posted 03-23-2006 07:33 PM ET (US)     Profile for rtk  Send Email to rtk     
The source of water is likely the fuel fill, I agree that should be checked first.

I had the same problem with my 1997 21 Outrage a couple of years ago. The fuel fill is the Perko combination fill and vent, 0541 on page 146 of the catalogue. It was installed without the additional mounting ring, figure 0540, page 146, so the filler base was flush to the deck.

I had a hard time (read impatient) finding the filler cap gasket and the mounting ring locally, so I just purchased an entire new fuel fill that had the mounting ring, and no more water.

I can't contribute the leak to just the filler cap gasket, but I am sure that was most of the problem. It was in bad shape, though still intact.

The mounting ring will get the fuel fill up off the deck a bit, and Perko recommends this ring for areas that get wet often. If your boat does not have the black ring below the fill I would recommend adding this in addition to changing the filler cap gasket.

After changing the fill and pumping the water out of the tank through the fuel line, I still had some water showing up in the filter, though not as much or as frequent. I removed the fuel pick up from the tank, and pumped the water directly off the bottom of the tank. The fuel pickup does not go to the absolute bottom of the tank. After I did this my fuel has been water free for two seasons.

I actually pumped around two gallons of water the first time I pumped the tank, so I know what you are going through. Be careful using dry gas or the like, check with a dealer as to a product that is recommended for your engine type.

Rich

rtk posted 03-23-2006 07:35 PM ET (US)     Profile for rtk  Send Email to rtk     
I forgot the link to the catalogue.

www.perko.com/Perko%20Catalog/127-158/underwaterhardware.pdf

Rich

Justcurious posted 03-24-2006 09:20 AM ET (US)     Profile for Justcurious  Send Email to Justcurious     
Thanks for all the great replys. I will try fuel fill and post reports.
23Conquest posted 04-11-2006 02:10 PM ET (US)     Profile for 23Conquest    
Justcurious,

I also think the problem is the gasket, you would smell gas if there was a pinhole. I am curious if a new gasket solved your problem.

After buying the same boat (97), I was concerned about this BUT I had a 75 Mako with a tank that sat in a well that was always wet. The tank lasted 28 years (75 Mako) and it was very thin compared to the conquests's tank.

Justcurious posted 04-14-2006 11:50 AM ET (US)     Profile for Justcurious  Send Email to Justcurious     
I have replaced gasket. Still have water in fuel. Does not seem to be pnhole/leak in tank. Only seems to happen when boat sits at dock for extended time with water in bilge. i.e. condensation? only thing that makes sense at this point.
rtk posted 04-14-2006 01:04 PM ET (US)     Profile for rtk  Send Email to rtk     
Are you sure you removed all the water from the fuel after replacing the fill cap o-ring?

Does the fuel fill have the spacer to get the fill up off the deck? It is a vented cap, so the fuel fill cap when tightened is not 100% sealed.

Other areas to check is the fuel level sender. It is attached to the top of the tank, typically gasketed. If water is getting on top of the tank it will leak in there if the gasket is bad or attachment is loose.

The other option you have is to have the fuel tank pressure tested to see if the tank itself has a hole in it. A local fuel tank fabricator may be able to perform the test for you. That would eliminate the tank as a cause.

After I replaced my fill and pumped the water out via the fuel pickup, I thought I had it beat. The next run out I still had water in the fuel. Removing the fuel pickup and pumping the water off the very bottom of the tank that the fuel pickup could not reach eliminated my water problem. It's the only way to get all the water out.

Rich


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