Small Inline Fuel Filters
Printed From: guzziriders.org - moto guzzi forum
Category: Technical
Forum Name: Alternative parts
Forum Description: Many parts can be found elsewhere at far lower prices.
URL: http://www.guzziriders.org/forum_posts.asp?TID=14977
Printed Date: 27 Mar 2026 at 04:01
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com
Topic: Small Inline Fuel Filters
Posted By: Bomber one
Subject: Small Inline Fuel Filters
Date Posted: 30 Jan 2023 at 18:49
|
Can anyone recommend a brand & supplier of inline fuel filters? My ebay Polisport purchase is leaking via a hairline crack after 1000 mls/4 months of E5 fuel. |
Replies:
Posted By: iansoady
Date Posted: 31 Jan 2023 at 09:52
|
I have one of these but haven't fitted it as yet. Made of glass & metal so should be robust (he hopes).... https://www.classicbikeshop.co.uk/in-line-chrome-fuel-filter.html" rel="nofollow - https://www.classicbikeshop.co.uk/in-line-chrome-fuel-filter.html  ------------- Ian 1964 Norton Electra 1965 BSA/Suzuki 1992 Yamaha SRV250 |
Posted By: Bomber one
Date Posted: 31 Jan 2023 at 22:04
| Ta for that, its showing out of stock currently. Perhaps a tad long at 40/90mm, would be interesting to see how it performs. |
Posted By: iansoady
Date Posted: 01 Feb 2023 at 09:52
|
It'll be a while before it goes live but I'll let you know. Hopefully the tank is clean enough so it won't be needed..... ------------- Ian 1964 Norton Electra 1965 BSA/Suzuki 1992 Yamaha SRV250 |
Posted By: Andyb
Date Posted: 01 Feb 2023 at 18:41
| I would avoid those - the mesh size is very small (50 micron?) and the area of the filter is also small and the combination means they can block up. Happened to me on the fast lane of the M25……. A similar type which has a filter twice as long is also available, or try a Hella Hengst H102WK (Transparent plastic and nylon mesh, 8mm ends). |
Posted By: krglorioso
Date Posted: 01 Feb 2023 at 18:58
|
I'd be very concerned about the use of any plastic or Nylon parts in a fuel line where ethanol fuel is in use. Owners of Guzzis with nylon fuel tanks (early 2000s Brevas like my '04 750) or any models that still have the metal/plastic in-tank fuel filter. Many unhappy stories about the effects of alcohol on Nylon and some other plastic products causing serious problems. Ralph ------------- Ralph G. |
Posted By: Andyb
Date Posted: 01 Feb 2023 at 19:46
|
I have used the HH plastic fuel filters on aircraft for years and they are fine with E10 - not saying all types are though! And plastic filters with paper elements are worth avoiding as well. OK on a lawnmower but again they can clog at higher flow rates. |
Posted By: 1down5up
Date Posted: 01 Feb 2023 at 19:53
|
About the only thing i think these fuel filters are good for is a visual to see if fuel is running to the carbs. There is a fuel filter under the banjo of your dellorto's thats is perfectly capable of stopping any random bit of gunk that makes is, along with a strainer connected to your fuel tap sticking inside the tank -   |
Posted By: Brian UK
Date Posted: 01 Feb 2023 at 20:58
The plastic/metal filter failure had nothing to do with Ethanol, according to the manufacturer, Mahle, they were designed to be used with diesel fuel. ------------- Brian. Better 5 minutes late in this world than years early in the next. |
krglorioso wrote:Posted By: krglorioso
Date Posted: 01 Feb 2023 at 23:49
|
Had never heard that, Brian. Ralph ------------- Ralph G. |
Posted By: Brian UK
Date Posted: 02 Feb 2023 at 07:35
|
I contacted Mahle customer services in the UK asking why these filters were failing, that was the answer they gave me. They also sent me 2 all metal KL145 filters FOC. ------------- Brian. Better 5 minutes late in this world than years early in the next. |
Posted By: Bomber one
Date Posted: 02 Feb 2023 at 09:14
I understand comments that the tap & banjo strainers could give adequate protection. But surely if the strainer on the tap is intact there shouldn't be enough debris getting through, to block this up? It would also provide a visual check without dismantling nowt? |
Posted By: Brian UK
Date Posted: 02 Feb 2023 at 10:21
|
Assumng this is a carb bike, what are you worried about? The usual filter on the tap should be more than adequate. Fuel injection is a totally different matter. ------------- Brian. Better 5 minutes late in this world than years early in the next. |
Posted By: iansoady
Date Posted: 02 Feb 2023 at 11:02
|
I've fitted that one partly so I can monitor flow and also as I've used an old tank which I have hopefully cleaned all the muck / rust out of but belt & braces. I do take the point re tap filter and actually considered leaving that out at least temporarily. A gallon in the tank and running the engine up for a few minutes shows that point 1 works and the petrol does look nice and clear. ------------- Ian 1964 Norton Electra 1965 BSA/Suzuki 1992 Yamaha SRV250 |
Posted By: Brian UK
Date Posted: 02 Feb 2023 at 13:28
|
I did have a case of fuel strvation once, when I removed the fuel tap I knew why. Problem with those filters, they are out of sight. So I do accept one you can see is more useful, but in that case I would consider removing the one in the tank. ------------- Brian. Better 5 minutes late in this world than years early in the next. |
Posted By: Andyb
Date Posted: 02 Feb 2023 at 18:59
|
I am not quite sure why anyone would need to be able to see the fuel flowing…..if it ain’t flowing the engine stops! The mesh size in the glass filter originally shown will be smaller than the mesh size of the filter in the tank so particles will get past the tank filter and collect in the glass filter. I know that Rotax stipulate a 100 micron mesh size for their 912 series aircraft engines with Bing CVs so presumably that size of particle will not cause a problem - so no need for a 50 micron filter like the glass one.
|
Posted By: iansoady
Date Posted: 03 Feb 2023 at 09:40
|
There are lots of reasons for the engine stopping..... My rationale for fitting this to a bike to which I've fitted a used tank which is over 30 years old is that despite my best efforts there may still be muck in it. It's easier to see if there's petrol flowing by just looking at the filter rather than undoing fuel pipes.....  ------------- Ian 1964 Norton Electra 1965 BSA/Suzuki 1992 Yamaha SRV250 |
Posted By: Andyb
Date Posted: 03 Feb 2023 at 10:27
| I guess you could disconnect the fuel line downstream of the filter and run fuel from the tank through the filter and into a can to see if any debris builds up in the filter? No need to have the engine running. |
Posted By: iansoady
Date Posted: 03 Feb 2023 at 10:50
|
True, but I would expect to see something in the filter itself. It comes apart for cleaning. ------------- Ian 1964 Norton Electra 1965 BSA/Suzuki 1992 Yamaha SRV250 |
Posted By: Andyb
Date Posted: 03 Feb 2023 at 12:00
| Yes, I was just thinking that by doing that you would clean the tank with any debris going into the filter, and if it blocked you would not be out on the road. |
Posted By: Brian UK
Date Posted: 03 Feb 2023 at 12:43
|
Could you guarantee getting all the muck out of the tank in one go? To be honest, if you have spent some time trying to get most of it out, what's left won't block a filter in a few hundred miles, so as long as you check that filter before each run, you won't get stranded. ------------- Brian. Better 5 minutes late in this world than years early in the next. |
Posted By: iansoady
Date Posted: 03 Feb 2023 at 15:40
|
In my case, what's coming through so far is perfectly clear although that's just running the engine for a few minutes on the stand. ------------- Ian 1964 Norton Electra 1965 BSA/Suzuki 1992 Yamaha SRV250 |
Posted By: Andyb
Date Posted: 03 Feb 2023 at 15:43
| Putting the tap onto reserve can help get any crud out. |
Posted By: iansoady
Date Posted: 03 Feb 2023 at 15:49
|
I've just been using reserve as I didn't want to put too much in. ------------- Ian 1964 Norton Electra 1965 BSA/Suzuki 1992 Yamaha SRV250 |
Posted By: Mike H
Date Posted: 10 Feb 2023 at 17:38
|
LOL ..  ------------- "Chicken nuggets don't dance on a Tuesday." |