Ducati Monster Forum

Moto Board => Tech => Topic started by: erkishhorde on October 28, 2008, 02:19:45 PM

Title: Fuel Filter
Post by: erkishhorde on October 28, 2008, 02:19:45 PM
So I just went to shop to order a fuel filter and they're telling me that there's 2... ??? I can only find the single one under the tank on my '95 m900 but the diagram they showed me had 2 that looked like they went just before the fuel gets to carbs (1 for each carb). This is wrong, isn't it? Can I used this part if they tell me that's all they got? Well, they're actually ordering it so they don't have it anyway.

Edit:
Was digging around some of the parts manuals. These are from a '00 M750
This first one is what they wanted to sell me. It's part #13
(http://i37.photobucket.com/albums/e70/erkishhorde/M750_Usa-00.jpg)

These next 2 show the part that I was expecting to get. It's not numbered in the first one but it's #21 in the second one.
(http://i37.photobucket.com/albums/e70/erkishhorde/M750_Usa-001.jpg)
(http://i37.photobucket.com/albums/e70/erkishhorde/M750_Usa-002.jpg)
Title: Re: Fuel Filter
Post by: ducpainter on October 28, 2008, 02:23:10 PM
Quote from: erkishhorde on October 28, 2008, 02:19:45 PM
So I just went to shop to order a fuel filter and they're telling me that there's 2... ??? I can only find the single one under the tank on my '95 m900 but the diagram they showed me had 2 that looked like they went just before the fuel gets to carbs (1 for each carb). This is wrong, isn't it? Can I used this part if they tell me that's all they got? Well, they're actually ordering it so they don't have it anyway.
There is a small strainer where the fuel line from the pump enters a manifold that feeds the carbs. That one should be fine. It can be blown out if you find debris there. I'm not aware of one for each, but I've been wrong before.

I'd just replace the one under the tank.
Title: Re: Fuel Filter
Post by: Jobu on October 28, 2008, 02:49:05 PM
I, without a doubt, only had one on my 1997 750 and now only have one on my 900 which works great.  It was the white filter under the tank which I replaced with a smaller inline filter.
Title: Re: Fuel Filter
Post by: Speeddog on October 28, 2008, 03:04:16 PM
There is only one filter.

The ones they are trying to tell you are fuel filters are the little air filters, one per carb, that are in the vent lines for the diaphragms.
Title: Re: Fuel Filter
Post by: erkishhorde on October 28, 2008, 03:54:08 PM
Quote from: Speeddog on October 28, 2008, 03:04:16 PM
There is only one filter.

The ones they are trying to tell you are fuel filters are the little air filters, one per carb, that are in the vent lines for the diaphragms.

Ah, exactly the kinda answer I was looking for. Thanks a million Nick! I owe you a beer next time I make it out to IBN. Whenever that is.... [roll]
Title: Re: Fuel Filter
Post by: Jobu on October 28, 2008, 04:20:56 PM
Quote from: Speeddog on October 28, 2008, 03:04:16 PM
There is only one filter.

The ones they are trying to tell you are fuel filters are the little air filters, one per carb, that are in the vent lines for the diaphragms.

I thought about that, but didn't think it was possible to mistake those for fuel filters by anyone that is responsible for ordering Duc parts.

Then again, I have meet some pretty incompetent folks at the local dealer.
Title: Re: Fuel Filter
Post by: Speeddog on October 28, 2008, 04:43:23 PM
Quote from: Jobu on October 28, 2008, 04:20:56 PM
I thought about that, but didn't think it was possible to mistake those for fuel filters by anyone that is responsible for ordering Duc parts.

Then again, I have meet some pretty incompetent folks at the local dealer.

Well, the parts catalogue *does* list them as 'filter', and it's on a page associated with the carbs.
But it's not out of line to expect better knowledge than that.
Title: Re: Fuel Filter
Post by: erkishhorde on October 28, 2008, 05:15:50 PM
Arg! When I called them to change the order for the correct part they actually have it in stock! Dang, if I didn't have to work hella overtime today I'd go grab the part and put my bike together tonight!  >:(
Title: Re: Fuel Filter
Post by: ducpainter on October 28, 2008, 05:43:26 PM
Quote from: Speeddog on October 28, 2008, 03:04:16 PM
There is only one filter.

The ones they are trying to tell you are fuel filters are the little air filters, one per carb, that are in the vent lines for the diaphragms.
Look again Nick.
Title: Re: Fuel Filter
Post by: brad black on October 28, 2008, 07:20:37 PM
the early models ran a different filter on the side of the frame, maybe the diagram is showing both.  haven't seen softway for a while.

the actual filter you need is the one under the tank.  42510021A i think.
Title: Re: Fuel Filter
Post by: Speeddog on October 28, 2008, 09:32:00 PM
Quote from: ducpainter on October 28, 2008, 05:43:26 PM
Look again Nick.

I've got no parts catalogues prior to '00, so I'm working from memory of the few earlier bikes I've seen.
Title: Re: Fuel Filter
Post by: erkishhorde on October 29, 2008, 12:25:34 AM
Updated my first post with pics from a parts manual. Now that I look at the picture I can see how Nick calls the part they tried to give me an air filter. I recognize the box that the hose they're on goes to. I seem to recall someone telling me that it's a sensor to see what "idle" air is... or something to that effect. There's nothing in that box at all so I don't see how they thought it was a fuel filter.
Title: Re: Fuel Filter
Post by: brad black on October 29, 2008, 05:09:34 AM
those hoses vent the area above the diaphragm (if that sounds right) and are the air inlets for the "choke" system, which is actually a seperate fuel and air circuit inside the carb.
Title: Re: Fuel Filter
Post by: Norm on October 29, 2008, 06:34:01 AM
Go to NAPA - $3 will get you a nice selection. Get clear plastic so you can see debris & get the biggest one you can live with. Install it between the tank & fuel pump. Any screens, etc, pitch in the trash.