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#11
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
"Rich Hampel" wrote
(Some excellent and useful information) I should have mentioned the 100 hour filter change in my post. That's about three seasons of operation for my service profile. There isn't a speck of water in my Racor settlement bowl but I think a filter change next season is indicated anyway. -- Roger Long |
#12
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
On Sun, 03 Jun 2007 21:36:22 GMT, Rich Hampel
wrote: .... if you are using the typical resinated paper filter elements (Racor, etc.) AND you have noticed free water in the sump of your filter .... then increase your normal changeout schedule OR keep a record of the differential operating pressure of the filter at near engine wide-open-throttle (WOT) ..... Roger Long There is one user group even more dependent on reliable engine performance than water craft users - light aircraft pilots. So it's no accident that a pre flight walk round includes a fuel sample (off the bottom of all tanks, and at the prefilter) to dump all water trapped in the fuel. A sampler valve might be a good idea for boaters too?? Brian Whatcott Altus OK |
#13
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
I have about 12 inches of clearance under my aluminum tank, a highly unusual
configuration. On my list of big projects is to cut into the flat bottom and attach a big sump for water and other crud to sink into. It's a nutty design with a big flat bottom so there is no sump point but it probably keeps any stuff in the bottom of the tank swirling around in suspension so it goes through the filters bit by bit. The suction is in the center so unlikely to pick up much. Maybe it isn't such a bad design after all. -- Roger Long |
#14
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
* Brian Whatcott wrote, On 6/4/2007 9:19 AM:
There is one user group even more dependent on reliable engine performance than water craft users - light aircraft pilots. So it's no accident that a pre flight walk round includes a fuel sample (off the bottom of all tanks, and at the prefilter) to dump all water trapped in the fuel. A sampler valve might be a good idea for boaters too?? I would second that. My previous boat had an aluminum tank that was odd shaped with one corner sticking down. That corner collected about a few ozs of water which eventually corroded through the tank. A drain would have saved a nasty repair. In fact, I think it would be hard to find a shop willing to do such a repair nowadays. |
#15
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
On Mon, 04 Jun 2007 10:33:58 -0400, Jeff wrote:
* Brian Whatcott wrote, On 6/4/2007 9:19 AM: There is one user group even more dependent on reliable engine performance than water craft users - light aircraft pilots. So it's no accident that a pre flight walk round includes a fuel sample (off the bottom of all tanks, and at the prefilter) to dump all water trapped in the fuel. A sampler valve might be a good idea for boaters too?? I would second that. My previous boat had an aluminum tank that was odd shaped with one corner sticking down. That corner collected about a few ozs of water which eventually corroded through the tank. A drain would have saved a nasty repair. In fact, I think it would be hard to find a shop willing to do such a repair nowadays. I mention quick drains from time to time. You can buy them in several screw threads.[Use Aviation Trader] Activated by a pin and sampler cup, or by a push n twist fitting. They use double valves for security. But I have heard it said that a tank drain may be a no-no in some boat reg versions. Brian Whatcott Altus OK |
#16
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
I wouldn't put a quick drain in a boat. I've seen too many puddles under
aircraft where the implications of a leak are far less serious. A little engine stuttering in an aircraft on a tight takeoff can kill you. Fuel leaking slowly out of a wing won't (usually). Aircraft also have very minimal fuel filtering. -- Roger Long |
#17
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
On Mon, 4 Jun 2007 13:51:46 -0400, "Roger Long"
wrote: I wouldn't put a quick drain in a boat. I've seen too many puddles under aircraft where the implications of a leak are far less serious. A little engine stuttering in an aircraft on a tight takeoff can kill you. Fuel leaking slowly out of a wing won't (usually). Aircraft also have very minimal fuel filtering. You may have seen puddles where the fuel sample is discarded - though this is now discouraged. Leaking fuel under an airplane is otherwise, a loss of airworthiness issue. Brian Whatcott altus OK |
#18
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
No, I was talking about my own plane. I used to do a lot of flying and fuel
sampling. It only takes a little bit of crud to lodge in the valve and it drips, usually slow enough that it evaporates before building up again. Resampling usually fixes it. Not something you would want happening on a boat where there is no place for it to go though. -- Roger Long |
#19
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
In article ,
"Roger Long" wrote: No, I was talking about my own plane. I used to do a lot of flying and fuel sampling. It only takes a little bit of crud to lodge in the valve and it drips, usually slow enough that it evaporates before building up again. Resampling usually fixes it. Not something you would want happening on a boat where there is no place for it to go though. That's why Aircraft Fuel costs more than Regular Fuel. It is the price of Filtering and Documentation of that Filtering to meet FAA Fuel Specs... |
#20
posted to rec.boats.cruising
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Aux sail fuel filter change cycle
That would be against ABYS & USCG specifications.
Marine tanks cant have any 'outlet' lower than the top of the tank ... leakage considerations. A surveyor would have a heart attack in finding a tank with a 'bottom tank', your insurance carrier would probably 'not allow' any claim that resulted in a faulty bottom tap. The CG wouldnt care ... the fine is the same if you pumped or inadvertantly dumped the oil. Use a separate 'dip tube' all the way to the bottom for water suction. OR ... use a 'water knock out pot' as the first stage in the fuel filtering system ... just an empty filter housing with a bottom tap thats attached to clear (tygon, etc.) tube. Most of the water will gravimetrically settle in the 'knockout pot'. When you see water in the tube you drain it. :-) In article , Roger Long wrote: I have about 12 inches of clearance under my aluminum tank, a highly unusual configuration. On my list of big projects is to cut into the flat bottom and attach a big sump for water and other crud to sink into. It's a nutty design with a big flat bottom so there is no sump point but it probably keeps any stuff in the bottom of the tank swirling around in suspension so it goes through the filters bit by bit. The suction is in the center so unlikely to pick up much. Maybe it isn't such a bad design after all. |
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