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post #1 of 9 (permalink) Old 06-12-2006, 06:33 PM Thread Starter
Main Motorcycle: 2003 Triumph T100
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Hello all. I have been messing about with fuel filters and have finally found a setup that I'm happy with. Check it out:

I realize that many of you don't like the idea of fuel filters, for various reasons. However, I like them because by adding them to a location that is accessible I can service it easily (unlike that cryptic filter unidentified in the service manual). I realize that the one I selected looks rather pedestrian, but it is translucent (allowing one to see if the fuel is flowing) and easy to find. This model is a Deusch FF314, available for $2.99 at Autozone. When installing, it helps to remove about 3/4" of the fuel line to make room for the body of the filter.

2003 Bonneville T100 and 2007 Moto Guzzi California Vintage
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post #2 of 9 (permalink) Old 06-12-2006, 08:13 PM
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Ok, you aren't gonna like this and you may not believe me, or maybe and hopefully you'll be lucky and for some reason it won't happen. But i did the same thing a while back. Different filter but the same as far as the reason i had problems. More on that in a minute.

The first time i hit reserve with the filter on i thought my bike had a problem. I was on the freeway and the bike started cutting out very badly as tho it was running on one cylinder. Figuring i should be on reserve after checking my odo i switched to reserve and waited for the cutting out to stop. 3 miles later after barely keeping it running at about 30-40 MPH in the slow lane, it began to run right again.. Then a few miles later i wanted to see if it really was because i was at reserve level and i switched the tap back. Again it cut out and i turned it back to reserve and it did it again till i made it home a few miles later. This happened again the next time i rode after turning it off reserve again a week later to see if it would still do it. It did. this time about 2 miles from home and i barely made it home. I removed it and put a new stock fuel line on.

Heres the deal....these types of filters are made to be used situated straight up and down, not sideways as you and i mounted them. My theory is that when sideways if you look at it and imagine it dry of fuel, when the fuel begins to flow it has to fill the filter to 1/2 way up befor it can begin to flow out the other side because the fuel nipple is in the middle. And mine is glass so i can see the fuel in it. And when i 1st installed it and turned on the tap for the first time i noticed that it took forever for the fuel to begin flowing and then fill it enough to go out the other side. So when you hit reserve the same sorta thing happens.

Now i'm not saying this will surely happen to you. But i'm warning you so that if it does it won't catch you by suprise and have you thinking your ignitor has gone bad or some other such thing as i did. The problem is there is so little room and the only place you can put a filter where it will be straight up and down is near the end that goes into the carbs, which would make it impossible to get to and defeat the purpose. i was recently told no filter is needed due to the filter in the tank on the petcock. And having seen it i tend to agree. It's mesh is just as fine as in a filter. Plus when i looked at it a ton of debris was caught by it while the stock hidden filter at the carbs was totally clean.

so just be aware and the next time you hit reserve be ready. If you have no problem, great. But at least if you do now you'll be ready for it and know why it's happening.

[ This message was edited by: dazco on 2006-06-12 19:15 ]
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post #3 of 9 (permalink) Old 06-12-2006, 08:35 PM
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Sheepdog & Dazco,
Fuel does not flow fast thru the petcock. It flows steady yes, but not fast. The idea is to keep it flowing. When your tank runs dry on the main petcock position with a big inline filter installed you have switched to reserve but the fuel line is empty, the oversize filter is empty and they both have to be full before the bike will run normal again. It's just something to get used to. One thing it won't do. It will not set you to walking,,,,,,the way the hidden filter will when it plugs up. 100 miles my backside is usually aching anyways so I fuel up at that time. I don't use reserve. No worries.

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post #4 of 9 (permalink) Old 06-12-2006, 10:41 PM
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Yes, but what i'm saying is that with the filter it took forever compared to w/o it. No bike should run like it's on 1 cylinder for 3 miles or more when you hit reserve. And none do, at least none i've ever owned. it only takes maybe 30 seconds max, usually only 10 or so. But with the filter.......well, figure it out.....3 miles at 40 MPH. i figure about 4-5 minutes till it started running normally again with that filter. Now with the filter gone it's back to normal. So i was just telling him to be prepared because that may happen to him too. generally i fill up before i hit 130 miles to be safe. But i can't always do that conveniently if at all depending on where my rides take me. So i know there are times i will hit reserve. just did a few days back in fact, but with that filter gone it was just a few seconds and i was back running normally.
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post #5 of 9 (permalink) Old 06-12-2006, 11:01 PM Thread Starter
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Point taken, Daz. I'll be careful to watch my odo.

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post #6 of 9 (permalink) Old 06-13-2006, 02:11 AM
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Why not change the Petcocks for greater fuel flow.
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post #7 of 9 (permalink) Old 06-13-2006, 05:51 AM
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I have a similar setup to sheepdog and have had no problems with fuel delivery. As a matter of fact, when I purchased my bike new it already had one installed at that location. After a couple of thousand miles I replaced it with a larger/high capacity filter of the same type due to having changed out the stock petcock with a Pingel.
The filter I'm using is the JC Whitney part # CAG010035 at $2.99 which uses a sintered porous bronze filtering element.


[ This message was edited by: Shorty on 2006-06-13 05:42 ]

Different Strokes, for different folks.

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post #8 of 9 (permalink) Old 06-13-2006, 09:36 AM
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I use a Pingel hi flo fuel valve and a Pingel fuel filter (metal)-works great! No Problems at all.
If you run out of gas you are out of gas -there is no in between with this set up.Like it should be. I put it on for the CR carbs swhich are coming soon I hope.

2005 T100 Bonneville 865cc "Creamsicle"
2004 Thruxton "Big Red"
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post #9 of 9 (permalink) Old 06-14-2006, 02:39 PM
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I have a nice looking MR Gasket glass and chrome filter mounted in line. it has been there for about 4000 miles with numerous switches to reserve and no problems at all.

I did disassemble and clean it once but I had the carbs off anyway (playing) and there was nothing much to clean out.

The filter is mounted at a slight down angle to the outlet end and is routed around the top rear engine mount.

I see no reason for the problem described by Daz other than a possible venting issue that would slow the flow of fuel into the line. Unless there is blockage between the tank and filter. And then it is still not the filter.

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904cc, 12:1 JE racing pistons, thunderbike cams, ported and polished head, scepter pipes, 39mm FCRs.
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