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fuel filters

Old 02-24-2011, 12:30 PM
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bigbri
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Default fuel filters

ok what are you guys using for final fuel filters between pump and turbine?
Old 02-24-2011, 12:53 PM
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Dave Wilshere
 
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Default RE: fuel filters

JetCat filters!
The only thing to remember is assemble the filter when you start the build, tighten fully, 2 days later you will crank it down more, if you try in another few days it will again go a 64th round. Once seated it will never leak. But from new the O rings do need re compressing

Dave
Old 02-24-2011, 02:22 PM
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Default RE: fuel filters

I like the clear Festos, mounted vertically. A "bubble check" to look for problems upstream is part of my pre-flight. It's just another way to help spot a small problem before it become a big one (flame out).
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Old 02-24-2011, 02:24 PM
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Dave Wilshere
 
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Default RE: fuel filters

I know of more than one that had a flaw and leak...But having said that if someone can't assemble a filter it's probably better...

Dave
Old 02-24-2011, 03:04 PM
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Default RE: fuel filters

Dave, I'm glad you posted that, I had a leak appear after 80 odd flights and after checking everything I never did find out where it was coming from.
As I was stripping everything I took the opportunity to check the filter and thought it was a little loose.
No leaks since so I think you hit the nail right on the head, thanks, I can sleep at night now!
Gary.
Old 02-24-2011, 03:23 PM
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Default RE: fuel filters

Gary

I know someone that could have lost a brand new model where one was leaking...from new!
Like anything, guess it needs checking before use.

Dave
Old 02-24-2011, 03:27 PM
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bigbri
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Default RE: fuel filters

i had a festo fail on me the end came off completely...jet was soaked in fuel...never use them agian
Old 02-24-2011, 03:30 PM
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Default RE: fuel filters

ooops. hmmmmmmm.

thanks for the heads up !
Old 02-24-2011, 03:38 PM
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Default RE: fuel filters

Gary,

I assume Dave is referring to my new Ultra lightning. I had two deadsticks in quick sucession, eventually trackked down to a very small leak in the festo fuel filter. I have used them plenty of times in the past but I won't be using them in the future.

Geoff.
Old 02-24-2011, 11:21 PM
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Default RE: fuel filters

The humble Sullivan Crap Trap. - John.
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Old 02-25-2011, 01:07 AM
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Default RE: fuel filters

Geoff and Dave, very interesting, as an ex engineer, when I started jets a couple of years ago I thought how well designed they were, mine was if anything overtightened originally with no problems but in those days I checked it every ten flights as per JC manual.
The one I had trouble with I didn't give it so much attention so I guess I asked for it, it certainly was not loose but not mega tight.
We live and learn eh!
Was it leaking past the o ring Geoff?
Old 02-25-2011, 02:13 AM
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Default RE: fuel filters

Morning Gary,

We are at cross purposes. I believe Dave is referring to the festo filters leaking, which is what happened to me. I have also used jetcat filters previously and never had one leak.

Geoff.
Old 02-25-2011, 03:26 AM
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Default RE: fuel filters

Is't it good enough with a filter clunc? do you add the extra filer just to be safe or does the filtercluncs not filter well enough?
Old 02-25-2011, 04:07 AM
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Default RE: fuel filters

Sorry Geoff, my mistake, bit early in the morning for me!
Old 02-25-2011, 04:11 AM
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Default RE: fuel filters

Henke, bit over the top maybe but I use a JC large felt clunk filter in the fuel cannister, then the uat filter, then the Jetcat filter.

Everytime I have checked the JC filter (last in line) I have never yet seen anything other than the odd spec of crap so it works for me, triple filtered!

For what a filter costs, nothing usually as they come with the engine, I think it's good insurance!
Gary.
Old 02-25-2011, 04:46 AM
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Default RE: fuel filters

I used Festo filters for years with no problem. Only gave them up coz I couldn't come to terms with the thought of the ever resident air bubble they seem to contain! That said, I never had a flame-out when using one, or a leak.

Cheers,

Dick

Old 02-25-2011, 05:23 AM
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Default RE: fuel filters

i use

NO LITTLE FILTERS
NO FILTERS IN THE TANK AND HOPPER
ONE FILTER (FESTO OR JETCAT TYPE) AFTER PUMP (between pump and turbine)

check frequently the filters due to kerosene contamination
Old 02-25-2011, 05:25 AM
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Default RE: fuel filters


ORIGINAL: madmodelman

Henke, bit over the top maybe but I use a JC large felt clunk filter in the fuel cannister, then the uat filter, then the Jetcat filter.

Everytime I have checked the JC filter (last in line) I have never yet seen anything other than the odd spec of crap so it works for me, triple filtered!

For what a filter costs, nothing usually as they come with the engine, I think it's good insurance!
Gary.
Ofcause the cost of a filter is not the issue, rather adding extra joints and possible weak spots where a leak might occur. I have no clue if there is a need for dubble or tripple filtering, so I thought I might pop the question :-)
Old 02-25-2011, 06:05 AM
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Default RE: fuel filters

Any time you assmble something that uses an o-ring or any other type of seal it should be lube up real well. A dry o-ring will stretch and bunch up when you tighten the fuel filter. I never had one leak or found that it needed to be tightened up after some use.

John

MAP
Old 02-25-2011, 06:42 AM
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Default RE: fuel filters

The gold metal filters that Jet Central uses are fine - Kingtech uses them to. Also, the larger silver filters that Jet Cat use work fine to. Like others, I don't like the plastic Festo filters. I like the ability to clean the filter if it gets clogged.

Andy
Old 02-25-2011, 06:46 AM
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Default RE: fuel filters

Fuel pump gears release tiny metallic particles into the fuel stream as they wear. This is most common on a new pump as it is breaking in. A final filter, just before the engine, is a good idea to trap those particles so that they don't end up clogging an injector or doing other damage. Wren engines, for example, come with a final filter installed under the front cover.

Joe
Old 02-25-2011, 07:01 AM
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Default RE: fuel filters

anyone ever "run-in" your fuel pump prior to installing into your airframe? just hook it up to an appropriate battery source, run a closed loop fuel system and let it run in for 15-20 minutes?
Old 02-25-2011, 07:14 AM
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Default RE: fuel filters

Yes, I've read of a number of people doing that. Although that minimizes the risk it's still a good idea to have a final filter.

Joe
Old 02-25-2011, 07:29 AM
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Default RE: fuel filters

Do you guys clean your filters out before a flying season??? I have a new viper that I flew only a handful of times at the end of last season..Would it be a good idea to take the filters apart before this season?? Would like to hear your spring checkups before the season starts..
Old 02-25-2011, 07:54 AM
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Default RE: fuel filters

i check and eventually clear the filter before every week flight session

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