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Author Topic:   Conquest 21 fuel capacity-oil tank overflow
tesija posted 06-20-2005 10:54 PM ET (US)   Profile for tesija   Send Email to tesija  
Were all 1999 Conquests 21' made with a 92 gal. fuel tank? My fuel guages (in dash and on tank)show close to empty, yet it only takes about 50 gal. to fill her up. Are both guages that far off, or do I have a smaller tank?
Also has anyone figured a good way to know when the oil tank is full to avoid spilling excess oil?
bluewaterpirate posted 06-21-2005 10:19 AM ET (US)     Profile for bluewaterpirate  Send Email to bluewaterpirate     
Look at tank before u start filling it. There are measurement lines on the side of the tank. U will be able to c how much oil is needed before u start.



Bill D posted 06-21-2005 10:54 AM ET (US)     Profile for Bill D  Send Email to Bill D     
On my 1998 21' Conquest if I raise the access seat it allows enough light to get in so I can see the oil level in the tank. Filling without overfill is not a problem then. My tank gauge and dash gauge sems to be pretty close and have not had a problem. With all the different places you can open and see parts of the tank I would think you could get pretty close to a size measurement and calculate your capacity, especially since your think you might have a 1/2 size tank.
tesija posted 06-21-2005 07:15 PM ET (US)     Profile for tesija  Send Email to tesija     
I don't know if I've got a smaller tank. The oil tank is plastic, so I can see how you'd look in to see what quantity of oil you need, but the gas tank is metal-you can't judge it by eyeballing it. I have to rely on the guages-that's why capacity is an issue.
dauntlass 18 posted 06-21-2005 10:07 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
On my 1999 21 Conquest you can watch the oil tank filling if you remove the access hatch in the motor well.My tank is mounted on the port side and my fill cap&hose to tank is mounted in the motor well on the port side.The standard fuel tank is 92gal.On my boat the dash gauge reads lower than the mechanical gauge on the tank example dash gauge 1/2 gauge on tank on low side of 3/4.
Bill D posted 06-22-2005 10:41 AM ET (US)     Profile for Bill D  Send Email to Bill D     
Sorry if I was not clear about the gas tank. I'm suggesting you can "measure" the physical size close enough to tell if you have a tank that is almost 1/2 the size of the normal tank. If it measures to be bigger then you know you have a problem with the gauge and that can be fixed. My gauge seems to be fairly accurate. It does "change" a greater amount depending on boat angle in water /on trailer when the gas level is low.
Chuck Tribolet posted 06-22-2005 12:50 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
Measure the length, width, and depth of the tank in inches.
Multiply the three numbers together to get volume in cubic
inches, then multiply that by 0.00432900431 (OK, you can round
it off to 0.0043) to get volume in gallons.


tesija posted 06-22-2005 09:36 PM ET (US)     Profile for tesija  Send Email to tesija     
I don't think you can see all of the gas tank under the deck to take the measurments. I guess I could let her run out of fuel (which I don't want to do) and see exactly how many galons it takes to fill her up. I was hoping to hear from other Conquest owners, to see if there was any deviation from the 92 gal. standard tank size, in 1999.
high sierra posted 06-22-2005 11:13 PM ET (US)     Profile for high sierra  Send Email to high sierra     
My first Volkswagen, a 1960 came with a stick with markings that you stuck in the tank to measure the gas. There was no gas gauge. Worked good. It was the only car that I ran out of gas regularly though. high sierra
dauntlass 18 posted 06-23-2005 02:32 PM ET (US)     Profile for dauntlass 18  Send Email to dauntlass 18     
Tesija contact Whaler they can tell you what size tank they put in boat when they built it have your serial number avilable when you talk to Whaler.My boat will take app. sixty gallons when the mechanical gauge reads quarter full
HawaiianWhaler posted 06-25-2005 06:57 AM ET (US)     Profile for HawaiianWhaler  Send Email to HawaiianWhaler     
This may be a dumb question, but when you looked at the mechanical fuel gauge on the tank, was there not a manufacturer's sticker there on the tank that gives, among other info, the tank capacity in gallons/liters? My '99 Conquest 21 has such a sticker on top the tank, just forward of the fuel connections and gauge. Maybe your sticker is just a little further forward under the lip of the pie plate?

p.s. my tank has 93 gallon capacity according to the sticker.

tesija posted 06-25-2005 11:03 PM ET (US)     Profile for tesija  Send Email to tesija     
I'll check-didn't notice it before.

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