Water in Fuel

[Grand_Marlin]

[FNQCairns]

I wouldn't run a racor simply because I dont like giving money away for no real gain. The cav has a minor degree of trouble with petrol because the filter glue is not guaranteed for use with petrol. So dont run a cav element filter 3x longer than a filter should be run.
The 296 was designed to filter oil, at that it does as good or better than any other filter designed to do the same.

Diesel is oil but for some reason it gets though and the engines run

Take it from someone who has cut a racor apart to compare, there is nothing better/best in a racor, apart from possibly the glue (probably the same stuff anyway. The racor is entirely average as a filter but the price ain't!
It is in effect nothing but a 296 filter wrapped in steel with a bowl at the bottom! Crikey that free space must cost a lot to manufacture.

The 296 is the filtering standard that all other filters designs work to for typical applications and yes that means marine also because apart from in our minds and in regulation the ACTUAL job the filter media does is exactly the same!! be it car/truck/plane/boat/dune buggy.

The day a 296 starts filtering out diesel oil is the day I start to worry over 2 stroke oil being filtered out also.

cheers fnq

[Grand_Marlin]

Onya FNQ Cairns,

Onya Blaze,

Finally someone to back up what I said.....

[Mantaray]

ah well a couple of bad peas in the pod don't make the rest bad just turf the bad ones

now maybe we should move on to the urban myth about water condensation in the fuel, don't happen folks, well not enough to be any sort of problem! you've all been duped. don't you get annoyed when people throw up urban myths that can never expalin the situation

[Grand_Marlin]

You must be on drugs....

[billfisher]

So where is all the water coming from Mantaray? I just drained my filter bulb and it was full of it and this is a regular occurance. Im sure its the same for other members. I don't get a water problem with the sealed portable tanks.

As long as I keep draining the filter the problem is under control. I have only had water get though to the motor if the bulb has been full of water. This is with a Racor filter.

[Skipsta]

Here here. I suffer from small amounts of water constantly getting into my fuel system. I have had the tank pressure tested, the inlet o ring is not compromised. No water is getting in through the breather. The water fairies aren't putting it in there . I say someone asks Dr Karl

[Mantaray]

now we might have to get a bit techncial here but lets see if some can think through this

how much consdensation can a cubic metre of air hold? anybody how about you pete
now how much fuel in a cubic metre ?
then we want to know what size tanks we are dealing with ?
what is required to produce condensation (that's water by the way pete ) now is that going from hot to cold or cold to hot and does this require sudden drop/increase in temperature

now if all this condensation stuff is temperature related then all those aeroplane things should be all falling out of the sky? right?

or wait for it

now just maybe you are getting your bad load of water from another source ??

my this is fun stuff hey

[Grand_Marlin]

Planes will never fall out of the sky.... they all use CAV filters

And if you are comparing Jet A-1 to regular unleaded.......

[Mantaray]

no talking about condensation, doesn't matter what's in the tank, condensation is simply condensation, Jet A-1 or otherwise, has to do with temperature but some very specific temperature conditions

[impulse492f]

now we might have to get a bit techncial here but lets see if some can think through this

how much consdensation can a cubic metre of air hold? anybody

30C/86F 30 grams/cubic meter
20C/50F 17 grams/cubic meter
10C/13F 9 grams/cubic meter

now how much fuel in a cubic metre ?

A cubic meter equals 264 gallons of liquid volume, therefore:

A 200 gallon tank = 0.76 cubic meter.

At 86F, an empty 200 gallon tank could contain 22.8 grams of water vapor, or 0.81 oz.

At 50F, an empty 200 gallon tank could contain 12.92 grams of water vapor, or 0.46 oz.

what is required to produce condensation

In order to condense water out of the atmosphere a surface must be much colder than the air.

Any other quizz Mantaray.

[FNQCairns]

Hi Mantaray, don't discount diffusion within your model, that 1m3 of air will be forced to stay in equilibrium with the air outside on an unclosed system, so in effect over a 4 hour period of condensing the mass of water absorbed could be VERY much larger, than what the original volume of air contained.
Then multiply that be 14 days of cycling between launches/trips. I am in no way saying that any of the air was also displaced (although some must due to temp variations), just the water it contained in one direction only within this continual physical process.

Most water I believe finds another way in but any boat in the backyard exposed to rapid temperature extremes is begging for condensate.

cheers fnq

[impulse492f]

Hi Mantaray, don't discount diffusion within your model, that 1m3 of air will be forced to stay in equilibrium with the air outside on an unclosed system, so in effect over a 4 hour period of condensing the mass of water absorbed could be VERY much larger, than what the original volume of air contained.
Then multiply that be 14 days of cycling between launches/trips. I am in no way saying that any of the air was also displaced (although some must due to temp variations), just the water it contained in one direction only within this continual physical process.

Most water I believe finds another way in but any boat in the backyard exposed to rapid temperature extremes is begging for condensate.

cheers fnq

WOH

[Skipsta]

I know it isn't getting in at the Bowser, I use a water separating fuel filler.

Anyways as I stated earlier, I fitted a second filter and gave it a good run today down at the Pin and ran like a scalded cat. Here is a couple of pics.

If you look close, you can see a few mls of water in the main filter >

[Mantaray]

that's very good impluse you are a lot clever than i first thought now teach the unteachables why condenstation is a way way overdone myth go to man and don't fall for the good old double shuffle two step